Clinical Practice Guidelines Example Implementation Guide - Anthrax Post-Exposure Prophylaxis
1.1.0 - ci-build
Clinical Practice Guidelines Example Implementation Guide - Anthrax Post-Exposure Prophylaxis, published by HL7 International - Clinical Decision Support WG. This guide is not an authorized publication; it is the continuous build for version 1.1.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/cqframework/cpg-example-anthrax/ and changes regularly. See the Directory of published versions
Draft as of 2024-08-23 |
<Library xmlns="http://hl7.org/fhir">
<id value="cds-connect-commons-library"/>
<text>
<status value="generated"/>
<div xmlns="http://www.w3.org/1999/xhtml"><p class="res-header-id"><b>Generated Narrative: Library cds-connect-commons-library</b></p><a name="cds-connect-commons-library"> </a><a name="hccds-connect-commons-library"> </a><a name="cds-connect-commons-library-en-US"> </a><h2>Participants</h2><table class="grid"><tr><td>Author</td><td>Alliance to Modernize Healthcare FFRDC</td></tr><tr><td>Endorser</td><td>Centers for Disease Control and Prevention</td></tr></table><h2>Contents</h2><p><code>text/cql</code></p><pre><code>// CDS Connect Commons for FHIRv400
// Change log:
// - 1.3.1:
// - Changed C.dateRecorded to C.dateRecorded.value in ConditionLookBack
// - Changed G.statusDate to G.statusDate.value in GoalLookBack
// - 1.3.2:
// - Added NotCancelled() and EncounterLookback() functions.
library CDS_Connect_Commons_for_FHIRv400 version '1.3.2'
using FHIR version '4.0.0'
// Include the FHIRHelpers library for simplifying interacton w/ the FHIR data model
include FHIRHelpers version '4.0.0' called FHIRHelpers
codesystem "Condition Verification Status Codes": 'http://terminology.hl7.org/CodeSystem/condition-ver-status'
codesystem "Condition Clinical Status Codes": 'http://terminology.hl7.org/CodeSystem/condition-clinical'
codesystem "AllergyIntolerance Verification Status Codes": 'http://terminology.hl7.org/CodeSystem/allergyintolerance-verification'
code "Condition verificationStatus confirmed code": 'confirmed' from "Condition Verification Status Codes" display 'Confirmed'
code "Condition clinicalStatus active code": 'active' from "Condition Clinical Status Codes" display 'Active'
code "Condition clinicalStatus recurrence code": 'recurrence' from "Condition Clinical Status Codes" display 'Recurrence'
code "Condition clinicalStatus relapse code": 'relapse' from "Condition Clinical Status Codes" display 'Relapse'
code "AllergyIntolerance verificationStatus confirmed code": 'confirmed' from "AllergyIntolerance Verification Status Codes" display 'Confirmed'
// -------------------------------------------------- GENERAL ---------------------------------------------------------
/**
* A null-safe version of ToConcept. Whereas FHIRHelpers.ToConcept will take a null argument and produce a
* System.Concept that is empty, this implementation returns null instead.
* @param C - a FHIR CodeableConcept
* @returns {System.Concept} a CQL Concept or null if null was passed in
*/
define function NullSafeToConcept(Cpt FHIR.CodeableConcept):
if Cpt is not null then FHIRHelpers.ToConcept(Cpt) else null
/**
* A null-safe version of ToInterval for Period. Whereas FHIRHelpers.ToInterval will take a null argument and produce a
* System.Interval that is empty, this implementation returns null instead.
* @param P - a FHIR Period
* @returns {System.Interval} a CQL Interval or null if null was passed in
*/
define function NullSafePeriodToInterval(Pd FHIR.Period):
if Pd is not null then Interval[Pd."start".value, Pd."end".value] else null
/**
* A null-safe version of ToInterval for Range. Whereas FHIRHelpers.ToInterval will take a null argument and produce a
* System.Interval that is empty, this implementation returns null instead.
* @param P - a FHIR Range
* @returns {System.Interval} a CQL Interval or null if null was passed in
*/
define function NullSafeRangeToInterval(Rg FHIR.Range):
if Rg is not null
then Interval[NullSafeToQuantity(Rg.low), NullSafeToQuantity(Rg.high)]
else null
/**
* Same as NullSafePeriodToInterval; kept for backward compatibility. [Deprecated]
* @param P - a FHIR Period
* @returns {System.Interval} a CQL Interval or null if null was passed in
*/
define function NullSafeToInterval(Pd FHIR.Period):
NullSafePeriodToInterval(Pd)
/**
* A null-safe version of ToQuantity. Whereas FHIRHelpers.ToQuantity will take a null argument and produce a
* System.Quantity that is empty, this implementation returns null instead.
* @param C - a FHIR Quantity
* @returns {System.Quantity} a CQL Quantity or null if null was passed in
*/
define function NullSafeToQuantity(Qty FHIR.Quantity):
if Qty is not null then
System.Quantity {
value: Qty.value.value,
unit: Coalesce(Qty.unit.value, Qty.code.value)
}
else null
// -------------------------------------------------- OBSERVATIONS -----------------------------------------------------
/**
* Filters Observations by a concept rather than by a ValueSet. In CQL 1.3, this will be built into the retrieve,
* but for now, we must use a query where clause.
* @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
* @returns {List<Observation>} a list of Observations matching the concept, or null if null was passed in
*/
define function ObservationsByConcept(Koncept System.Concept):
[Observation] O where NullSafeToConcept(O.code) ~ Koncept
/**
* Observations that are complete and verified. In FHIR R4, there are two statuses that indicate this state: 'final'
* and 'amended'.
* @see https://www.hl7.org/fhir/valueset-observation-status.html
* @param ObsList - a list of Observations
* @returns {List<Observation>} a list of verified Observations, or null if null was passed in
*/
define function Verified(ObsList List<Observation>):
ObsList O where O.status.value in {'final', 'amended'}
/**
* Observations that have quantity values recorded in the requested unit.
* @param ObsList - a list of Observations
* @param Unit - the unit to require in the Observations quantity value
* @returns {List<Observation>} a list of Observations with the required unit, or null if null was passed in
*/
define function WithUnit(ObsList List<Observation>, Unit String):
ObsList O where O.value.unit.value = Unit or O.value.code.value = Unit
/**
* Observations with an effective or issued date in the specified "look back" period. For example, LDL-C Tests in the
* last 6 years.
* TODO: Rename to LookBack once the execution engine supports overloaded functions.
* @param ObsList - a list of Observations
* @returns {List<Observation>} a list of Observations with effective or issued date specified lookback period, or null
* if null was passed in
*/
define function ObservationLookBack(ObsList List<Observation>, LookBack System.Quantity):
ObsList O
let LookBackInterval: Interval[Now() - LookBack, Now()]
where O.effective.value in LookBackInterval
or NullSafeToInterval(O.effective) overlaps LookBackInterval
or O.issued.value in LookBackInterval
/**
* The most recent observation. For each Observation, this algorithm will use the FindDate function, which uses the
* first non-null date value from these fields: effectiveDateTime, effectivePeriod.end, effectivePeriod.start, issued.
* The found date will be used to compare Observations and determine the most recent one.
* @see FindDate(Observation)
* @param ObsList - a list of Observations
* @returns {Observation} the most recent Observation from the list, or null if null was passed in
*/
define function MostRecent(ObsList List<Observation>):
Last(ObsList O sort by Coalesce(effective.value, effective."end".value, effective."start".value, issued.value))
/**
* Extracts the quantity value from an Observation, returning it as a CQL Quantity
* @param Obs - an observation
* @returns {System.Quantity} the Observation's value as a quantity, or null if there is no quantity value
*/
define function QuantityValue(Obs Observation):
NullSafeToQuantity(Obs.value)
/**
* Extracts the CodeableConcept value from an Observation, returning it as a CQL Concept
* @param Obs - an observation
* @returns {System.Concept} the Observation's value as a concept, or null if there is no CodeabeConcept value
*/
define function ConceptValue(Obs Observation):
NullSafeToConcept(Obs.value)
/**
* Finds the first non-null meaningful date that can be associated with this Observation. This will look through the
* following fields in the following order: effectiveDateTime, effectivePeriod.end, effectivePeriod.start, issued.
* @param Obs - an Observation
* @returns {System.DateTime} the first non-null meaningful date, or null if non is found
*/
define function FindDate(Obs Observation):
Coalesce(Obs.effective.value, Obs.effective."end".value, Obs.effective."start".value, Obs.issued.value)
// TODO: Confirm that this works as expected
/**
* The highest observation.
* The value will be used to compare Observations and determine the highest one.
* @param ObsList - a list of Observations
* @returns {System.Quantity} the quantity with the highest value from the list, or null if null was passed in
*/
define function HighestObservation(ObsList List<Observation>):
Max(ObsList O return NullSafeToQuantity(O.value))
// -------------------------------------------------- CONDITIONS -------------------------------------------------------
/**
* Filters Conditions by a concept rather than by a ValueSet. In CQL 1.3, this will be built into the retrieve,
* but for now, we must use a query where clause.
* @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
* @returns {List<Observation>} a list of Conditions matching the concept, or null if null was passed in
*/
define function ConditionsByConcept(Koncept System.Concept):
[Condition] C where NullSafeToConcept(C.code) ~ Koncept
/**
* Conditions that are confirmed. In FHIR R4, this is reflected by verificationStatus: 'confirmed'.
* @see https://www.hl7.org/fhir/valueset-condition-ver-status.html
* @param CondList - a list of Conditions
* @returns {List<Condition>} a list of confirmed Conditions, or null if null was passed in
*/
define function Confirmed(CondList List<Condition>):
CondList C where C.verificationStatus.coding ~ "Condition verificationStatus confirmed code"
/**
* Conditions that are active. In FHIR R4, this is reflected by clinicalStatus: 'active' and the absence of any
* abatement information (i.e., if it abated, it is no longer active).
* TODO: Rename to Active once the execution engine supports overloaded functions.
* @see https://www.hl7.org/fhir/valueset-condition-clinical.html
* @param CondList - a list of Conditions
* @returns {List<Condition>} a list of active Conditions, or null if null was passed in
*/
define function ActiveCondition(CondList List<Condition>):
CondList C
where C.clinicalStatus.coding ~ "Condition clinicalStatus active code"
and C.abatement is null
/**
* Conditions that are active or recurring. In FHIR R4, this is reflected by clinicalStatus: 'active', 'recurrence', or 'relapse'.
* We do not check for null abatement information because it may have dates from when the now recurring condition
* initially went into remission.
* @see https://www.hl7.org/fhir/valueset-condition-clinical.html
* @param CondList - a list of Conditions
* @returns {List<Condition>} a list of active or recurring Conditions, or null if null was passed in
*/
define function ActiveOrRecurring(CondList List<Condition>):
CondList C where C.clinicalStatus.coding ~ "Condition clinicalStatus active code"
or C.clinicalStatus.coding ~ "Condition clinicalStatus recurrence code"
or C.clinicalStatus.coding ~ "Condition clinicalStatus relapse code"
/**
* Conditions with an onset or recorded date in the specified "look back" period. For example, pregnancy in
* the last 42 weeks.
* TODO: Rename to LookBack once the execution engine supports overloaded functions.
* @param CondList - a list of Conditions
* @returns {List<Condition>} a list of Conditions with onset or recorded date specified lookback period, or null
* if null was passed in
*/
define function ConditionLookBack(CondList List<Condition>, LookBack System.Quantity):
CondList C
let LookBackInterval: Interval[Now() - LookBack, Now()]
where C.onset.value in LookBackInterval
or NullSafeToInterval(C.onset) overlaps LookBackInterval
or C.recordedDate.value in LookBackInterval
// TODO Confirm these are the correct fields to use
// -------------------------------------------------- PROCEDURES -------------------------------------------------------
/**
* Filters Procedures by a concept rather than by a ValueSet. In CQL 1.3, this will be built into the retrieve,
* but for now, we must use a query where clause.
* @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
* @returns {List<Procedure>} a list of Procedures matching the concept, or null if null was passed in
*/
define function ProceduresByConcept(Koncept System.Concept):
[Procedure] P where NullSafeToConcept(P.code) ~ Koncept
/**
* Procedures that are completed. In FHIR R4, this is reflected by status: 'completed'. In addition, the
* notDone flag must be checked to ensure it is not 'true'.
* @see https://www.hl7.org/fhir/valueset-event-status.html
* @param ProcList - a list of Procedures
* @returns {List<Procedure>} a list of completed Procedures, or null if null was passed in
*/
define function Completed(ProcList List<Procedure>):
ProcList P
where P.status.value = 'completed'
/**
* Procedures that are in progress. In FHIR R4, this is reflected by status: 'in-progress'. In addition, the
* notDone flag must be checked to ensure it is not 'true'.
* @see https://www.hl7.org/fhir/valueset-event-status.html
* @param ProcList - a list of Procedures
* @returns {List<Procedure>} a list of completed Procedures, or null if null was passed in
*/
define function ProcedureInProgress(ProcList List<Procedure>):
ProcList P
where P.status.value = 'in-progress'
/**
* Procedures that actually happened or are happening. In FHIR R4, there are a few properties that negate the
* procedure, most notably when status is 'entered-in-error' or notDone is true.
* @see https://www.hl7.org/fhir/valueset-event-status.html
* @param ProcList - a list of Procedures
* @returns {List<Procedure>} a list of Procedures that actually happened or are happening, or null if null was passed in
*/
define function ProcedurePerformance(ProcList List<Procedure>):
ProcList P
where P.status.value != 'entered-in-error'
/**
* Procedures performed in the specified "look back" period. For example, PCIs performed in the
* past 2 weeks.
* TODO: Rename to LookBack once the execution engine supports overloaded functions.
* @param ProcList - a list of Procedures
* @param LookBack - the lookback period for when the procedure was performed
* @returns {List<Procedure>} a list of Procedures performed in the look back period, or null if null
* was passed in
*/
define function ProcedureLookBack(ProcList List<Procedure>, LookBack System.Quantity):
ProcList P
let LookBackInterval: Interval[Now() - LookBack, Now()]
where P.performed.value in LookBackInterval
or NullSafeToInterval(P.performed) overlaps LookBackInterval
// Note: ProcedureRequest and ReferralRequest resources have been replaced in FHIR R4 with the ServiceRequest resource.
// TODO: When needed, come back and ServiceRequest helper functions.
// // ---------------------------------------------- PROCEDUREREQUESTS ----------------------------------------------------
// /**
// * Filters ProcedureRequests by a concept rather than by a ValueSet. In CQL 1.3, this will be built into the retrieve,
// * but for now, we must use a query where clause.
// * @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
// * @returns {List<ProcedureRequest>} a list of ProcedureRequests matching the concept, or null if null was passed in
// */
// define function ProcedureRequestsByConcept(Koncept System.Concept):
// [ProcedureRequest] P where NullSafeToConcept(P.code) ~ Koncept
// /**
// * ProcedureRequests that are accepted, in progress, or completed. In FHIR DSTU2, this is reflected by the corresponding
// * status status values.
// * @see http://hl7.org/fhir/DSTU2/valueset-procedure-request-status.html
// * @param ProcReqList - a list of ProcedureRequests
// * @returns {List<ProcedureRequest>} a list of accepted, in-progress, or completed ProcedureRequests,
// * or null if null was passed in
// */
// define function ProcedureRequestAcceptedOrInProgressOrCompleted(ProcReqList List<ProcedureRequest>):
// ProcReqList P
// where P.status.value in List{'accepted', 'in-progress', 'completed'}
// /**
// * ProcedureRequests ordered in the specified "look back" period. For example, PCIs ordered in the
// * past 2 weeks.
// * TODO: Rename to LookBack once the execution engine supports overloaded functions.
// * @param ProcReqList - a list of ProcedureRequests
// * @param LookBack - the lookback period for when the procedure was ordered
// * @returns {List<ProcedureRequest>} a list of ProcedureRequests ordered in the look back period, or null if null
// * was passed in
// */
// define function ProcedureRequestLookBack(ProcReqList List<ProcedureRequest>, LookBack System.Quantity):
// ProcReqList P
// where P.authoredOn.value in Interval[Now() - LookBack, Now()]
// // ----------------------------------------------- REFERRALREQUESTS ----------------------------------------------------
// /**
// * Filters ReferralRequests by a concept rather than by a ValueSet. In CQL 1.3, this will be built into the retrieve,
// * but for now, we must use a query where clause.
// * @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
// * @returns {List<ReferralRequest>} a list of ReferralRequests matching the concept, or null if null was passed in
// */
// define function ReferralRequestsByServiceRequestedConcept(Koncept System.Concept):
// [ReferralRequest] R
// where exists((R.serviceRequested) SRC where NullSafeToConcept(SRC) ~ Koncept)
// /**
// * ReferralRequests that are accepted, active, or completed. In FHIR DSTU2, this is reflected by the corresponding
// * status status values.
// * @see http://hl7.org/fhir/DSTU2/valueset-referralstatus.html
// * @param ReferralList - a list of ReferralRequests
// * @returns {List<ReferralRequest>} a list of accepted, active, or completed ReferralRequests,
// * or null if null was passed in
// */
// define function ReferralRequestAcceptedOrActiveOrCompleted(ReferralList List<ReferralRequest>):
// ReferralList R
// where R.status.value in List{'accepted', 'active', 'completed'}
// /**
// * ReferralRequests requested in the specified "look back" period. For example, pace make insertions referrals sent
// * in the past 2 weeks.
// * TODO: Rename to LookBack once the execution engine supports overloaded functions.
// * @param ReferralList - a list of ReferralRequests
// * @param LookBack - the lookback period for when the referral was sent
// * @returns {List<ReferralRequest>} a list of ReferralRequests sent in the look back period, or null if null
// * was passed in
// */
// define function ReferralRequestLookBack(ReferralList List<ReferralRequest>, LookBack System.Quantity):
// ReferralList R
// where R.authoredOn.value in Interval[Now() - LookBack, Now()]
// -------------------------------------------------- MEDICATIONS ------------------------------------------------------
/**
* Filters MedicationStatements by a concept rather than by a ValueSet. In CQL 1.3, this will be built into the retrieve,
* but for now, we must use a query where clause.
* @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
* @returns {List<MedicationStatement>} a list of MedicationStatement matching the concept, or null if null was passed in
*/
define function MedicationStatementsByConcept(Koncept System.Concept):
[MedicationStatement] M where NullSafeToConcept(M.medication) ~ Koncept
/**
* Filters MedicationRequests by a concept rather than by a ValueSet. In CQL 1.3, this will be built into the retrieve,
* but for now, we must use a query where clause.
* @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
* @returns {List<MedicationRequest>} a list of MedicationRequests matching the concept, or null if null was passed in
*/
define function MedicationRequestsByConcept(Koncept System.Concept):
[MedicationRequest] M where NullSafeToConcept(M.medication) ~ Koncept
/**
* Medications that are active, according to a statement, but not necessarily verified via a prescription. For example,
* medications that a patient has self-reported to be taking. In FHIR R4, this is reflected by MedicationStatement
* with status 'active', no flag indicating it wasn't taken, and no end date or an end date in the future.
* TODO: Rename to Active once the execution engine supports overloaded functions.
* @see https://www.hl7.org/fhir/valueset-medication-statement-status.html
* @param MedList - a list of MedicationStatements
* @returns {List<MedicationStatement>} a list of active medication statements, or null if null was passed in
*/
define function ActiveMedicationStatement(MedList List<MedicationStatement>):
MedList M
let EffectivePeriod: NullSafeToInterval(M.effective)
where M.status.value = 'active'
and (end of EffectivePeriod is null or end of EffectivePeriod after Now())
/**
* Medications that are active or completed, according to a statement, but not necessarily verified via a prescription.
* For example, medications that a patient has self-reported to be taking. In FHIR R4, this is reflected by
* MedicationStatement with status 'active' or 'completed', and no flag indicating it wasn't taken.
* TODO: Rename to ActiveOrCompleted once the execution engine supports overloaded functions.
* @see https://www.hl7.org/fhir/valueset-medication-statement-status.html
* @param MedList - a list of MedicationStatements
* @returns {List<MedicationStatement>} a list of active or completed medication statements, or null if null was passed
* in
*/
define function ActiveOrCompletedMedicationStatement(MedList List<MedicationStatement>):
MedList M
where M.status.value = 'active'
or M.status.value = 'completed'
/**
* Medications that are active, according to a prescription. In FHIR R4, this is reflected by MedicationRequest
* with status 'active' and no dateEnded. There is currently an open question in the FHIR chat to determine if this
* is the right approach.
* @see https://www.hl7.org/fhir/valueset-medicationrequest-status.html
* @param MedList - a list of MedicationRequests
* @returns {List<MedicationRequest>} a list of active medication orders, or null if null was passed in
*/
define function ActiveMedicationRequest(MedList List<MedicationRequest>):
MedList M
where M.status.value = 'active'
/**
* Medications that are active or completed, according to a prescription. In FHIR R4, this is reflected by MedicationRequest
* with status 'active' or 'completed'
* @see https://www.hl7.org/fhir/valueset-medicationrequest-status.html
* @param MedList - a list of MedicationRequests
* @returns {List<MedicationRequest>} a list of active medication orders, or null if null was passed in
*/
define function ActiveOrCompletedMedicationRequest(MedList List<MedicationRequest>):
MedList M
where M.status.value = 'active'
or M.status.value = 'completed'
/**
* Medications that are active, completed, or stopped, according to a prescription. In FHIR R4, this is reflected by
* MedicationRequest with status 'active', 'completed', or 'stopped'
* @see https://www.hl7.org/fhir/valueset-medicationrequest-status.html
* @param MedList - a list of MedicationRequests
* @returns {List<MedicationRequest>} a list of active medication orders, or null if null was passed in
*/
define function ActiveCompletedOrStoppedMedicationRequest(MedList List<MedicationRequest>):
MedList M
where M.status.value = 'active'
or M.status.value = 'completed'
or M.status.value = 'stopped'
/**
* MedicationStatement with an effective date in the specified "look back" period. For example, statements about opioid
* use in the last 180 days.
* TODO: Rename to LookBack once the execution engine supports overloaded functions.
* @param MedList - a list of MedicationStatements
* @param LookBack - a duration Quantity indicating how far back to look for MedicationStatements
* @returns {List<MedicationStatement>} a list of MedicationStatements with effective date in the specified lookback
* period, or null if null was passed in
*/
define function MedicationStatementLookBack(MedList List<MedicationStatement>, LookBack System.Quantity):
MedList M
let LookBackInterval: Interval[Now() - LookBack, Now()]
where M.effective.value in LookBackInterval
or NullSafeToInterval(M.effective) overlaps LookBackInterval
/**
* MedicationRequests with a written date in the specified "look back" period. For example, opioid orders in the last
* 180 days.
* TODO: Rename to LookBack once the execution engine supports overloaded functions.
* @param OrderList - a list of MedicationRequests
* @param LookBack - a duration Quantity indicating how far back to look for MedicationRequests
* @returns {List<MedicationRequest>} a list of MedicationRequests with written date in the specified lookback period,
* or null if null was passed in
*/
define function MedicationRequestLookBack(MedList List<MedicationRequest>, LookBack System.Quantity):
MedList M where M.authoredOn.value in Interval[Now() - LookBack, Now()]
// -------------------------------------------------- ENCOUNTERS ------------------------------------------------------
/**
* Filters Encounters by a concept rather than by a ValueSet. In CQL 1.3, this will be built into the retrieve,
* but for now, we must use a query where clause.
* @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
* @returns {List<Encounter>} a list of Encounters matching the concept, or null if null was passed in
*/
define function EncountersByConcept(Koncept System.Concept):
[Encounter] E where exists( (E.type) ET where NullSafeToConcept(ET) ~ Koncept )
/**
* Encounters that are in progress. In FHIR R4, this is reflected by status: 'in-progress'.
* @see https://www.hl7.org/fhir/valueset-encounter-status.html
* @param EncList - a list of Encounters
* @returns {List<Encounter>} a list of in progress encounters, or null if null was passed in
*/
define function InProgress(EncList List<Encounter>):
EncList E
where E.status.value = 'in-progress'
/**
* Encounters that have not been cancelled. In FHIR R4, this is reflected by andy status other
* than: 'cancelled'.
* @see https://www.hl7.org/fhir/valueset-encounter-status.html
* @param EncList - a list of Encounters
* @returns {List<Encounter>} a list of in progress encounters, or null if null was passed in
*/
define function NotCancelled(EncList List<Encounter>):
EncList E
where E.status.value != 'cancelled'
/**
* Encounters performed in the specified "look back" period.
* TODO: Rename to LookBack once the execution engine supports overloaded functions.
* @param EncList - a list of Encounters
* @param LookBack - the lookback period for when the encounter occurred
* @returns {List<Encounter>} a list of Encounters occurring during the look back period, or null if null
* was passed in
*/
define function EncounterLookBack(EncList List<Encounter>, LookBack System.Quantity):
EncList E
let LookBackInterval: Interval[Now() - LookBack, Now()]
where NullSafeToInterval(E.period) overlaps LookBackInterval
// -------------------------------------------------- ALLERGY INTOLERANCES ---------------------------------------------
/**
* Filters AllergyIntolerances by a concept rather than by a ValueSet. In CQL 1.3, this will be built into the retrieve,
* but for now, we must use a query where clause.
* @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
* @returns {List<AllergyIntolerance>} a list of Allergy Intolerances matching the concept, or null if null was passed in
*/
define function AllergyIntolerancesByConcept(Koncept System.Concept):
[AllergyIntolerance] A where NullSafeToConcept(A.code) ~ Koncept
/**
* AllergyIntolerances that are active or confirmed. In FHIR R4, this is reflected by AllergyIntolerance
* with verificationStatus 'active' or 'confirmed'
* @see https://www.hl7.org/fhir/valueset-allergyintolerance-verification.html
* @param AllergyIntolList - a list of AllergyIntolerances
* @returns {List<AllergyIntolerance>} a list of active or confirmed allergy intolerances, or null if null was passed in
*/
define function ConfirmedAllergyIntolerance(AllergyIntolList List<AllergyIntolerance>):
AllergyIntolList A
where A.verificationStatus.coding ~ "AllergyIntolerance verificationStatus confirmed code"
// -------------------------------------------------------- GOALS ------------------------------------------------------
/**
* Goals with a start, target, or status date in the specified "look back" period. For example, Pain Management Goals
* in the last 2 years.
* TODO: Rename to LookBack once the execution engine supports overloaded functions.
* @param GoalList - a list of Goals
* @returns {List<Goal>} a list of Goals with a start, target, or status date in the specified lookback period, or null
* if null was passed in
*/
define function GoalLookBack(GoalList List<Goal>, LookBack System.Quantity):
GoalList G
let LookBackInterval: Interval[Now() - LookBack, Now()]
where G.start.value in LookBackInterval
or G.target.dueD in LookBackInterval
or G.start.value in LookBackInterval
or G.statusDate.value in LookBackInterval
</code></pre><p><code>No Content</code> (<code>application/elm+xml</code>)</p></div>
</text>
<url
value="http://hl7.org/fhir/uv/cpg/anthrax/Library/cds-connect-commons-library"/>
<identifier>
<use value="official"/>
<value value="CDS_Connect_Commons_for_FHIRv400"/>
</identifier>
<version value="1.1.0"/>
<name value="CDS_Connect_Commons_for_FHIRv400_Library"/>
<title value="CDS Connect Commons for FHIRv400"/>
<status value="draft"/>
<experimental value="true"/>
<type>
<coding>
<system value="http://terminology.hl7.org/CodeSystem/library-type"/>
<code value="logic-library"/>
</coding>
</type>
<date value="2024-08-23T15:47:13+00:00"/>
<publisher value="HL7 International - Clinical Decision Support WG"/>
<contact>
<name value="HL7 International - Clinical Decision Support WG"/>
<telecom>
<system value="url"/>
<value value="http://www.hl7.org/Special/committees/dss/index.cfm"/>
</telecom>
</contact>
<description
value="A library containing common methods used by CDS Connect-developed artifacts"/>
<jurisdiction>
<coding>
<system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/>
<code value="001"/>
<display value="World"/>
</coding>
</jurisdiction>
<topic>
<text value="Anthrax"/>
</topic>
<topic>
<text value="Emergency Medicine"/>
</topic>
<topic>
<text value="Post-Exposure Prophylaxis"/>
</topic>
<author>
<name value="Alliance to Modernize Healthcare FFRDC"/>
</author>
<endorser>
<name value="Centers for Disease Control and Prevention"/>
</endorser>
<content>
<contentType value="text/cql"/>
<data
value="// CDS Connect Commons for FHIRv400
// Change log:
// - 1.3.1:
//   - Changed C.dateRecorded to C.dateRecorded.value in ConditionLookBack
//   - Changed G.statusDate to G.statusDate.value in GoalLookBack
// - 1.3.2:
//   - Added NotCancelled() and EncounterLookback() functions.
library CDS_Connect_Commons_for_FHIRv400 version '1.3.2'

using FHIR version '4.0.0'

// Include the FHIRHelpers library for simplifying interacton w/ the FHIR data model
include FHIRHelpers version '4.0.0' called FHIRHelpers

codesystem "Condition Verification Status Codes": 'http://terminology.hl7.org/CodeSystem/condition-ver-status'
codesystem "Condition Clinical Status Codes": 'http://terminology.hl7.org/CodeSystem/condition-clinical'
codesystem "AllergyIntolerance Verification Status Codes": 'http://terminology.hl7.org/CodeSystem/allergyintolerance-verification'

code "Condition verificationStatus confirmed code": 'confirmed' from "Condition Verification Status Codes" display 'Confirmed'
code "Condition clinicalStatus active code": 'active' from "Condition Clinical Status Codes" display 'Active'
code "Condition clinicalStatus recurrence code": 'recurrence' from "Condition Clinical Status Codes" display 'Recurrence'
code "Condition clinicalStatus relapse code": 'relapse' from "Condition Clinical Status Codes" display 'Relapse'
code "AllergyIntolerance verificationStatus confirmed code": 'confirmed' from "AllergyIntolerance Verification Status Codes" display 'Confirmed'

// -------------------------------------------------- GENERAL ---------------------------------------------------------

/**
 * A null-safe version of ToConcept.  Whereas FHIRHelpers.ToConcept will take a null argument and produce a
 * System.Concept that is empty, this implementation returns null instead.
 * @param C - a FHIR CodeableConcept
 * @returns {System.Concept} a CQL Concept or null if null was passed in
 */
define function NullSafeToConcept(Cpt FHIR.CodeableConcept):
  if Cpt is not null then FHIRHelpers.ToConcept(Cpt) else null

/**
 * A null-safe version of ToInterval for Period.  Whereas FHIRHelpers.ToInterval will take a null argument and produce a
 * System.Interval that is empty, this implementation returns null instead.
 * @param P - a FHIR Period
 * @returns {System.Interval} a CQL Interval or null if null was passed in
 */
define function NullSafePeriodToInterval(Pd FHIR.Period):
  if Pd is not null then Interval[Pd."start".value, Pd."end".value] else null

/**
 * A null-safe version of ToInterval for Range.  Whereas FHIRHelpers.ToInterval will take a null argument and produce a
 * System.Interval that is empty, this implementation returns null instead.
 * @param P - a FHIR Range
 * @returns {System.Interval} a CQL Interval or null if null was passed in
 */
define function NullSafeRangeToInterval(Rg FHIR.Range):
  if Rg is not null
    then Interval[NullSafeToQuantity(Rg.low), NullSafeToQuantity(Rg.high)]
  else null

/**
 * Same as NullSafePeriodToInterval; kept for backward compatibility.  [Deprecated]
 * @param P - a FHIR Period
 * @returns {System.Interval} a CQL Interval or null if null was passed in
 */
define function NullSafeToInterval(Pd FHIR.Period):
  NullSafePeriodToInterval(Pd)

/**
 * A null-safe version of ToQuantity.  Whereas FHIRHelpers.ToQuantity will take a null argument and produce a
 * System.Quantity that is empty, this implementation returns null instead.
 * @param C - a FHIR Quantity
 * @returns {System.Quantity} a CQL Quantity or null if null was passed in
 */
define function NullSafeToQuantity(Qty FHIR.Quantity):
  if Qty is not null then
    System.Quantity {
      value: Qty.value.value,
      unit: Coalesce(Qty.unit.value, Qty.code.value)
    }
  else null

// -------------------------------------------------- OBSERVATIONS -----------------------------------------------------

/**
 * Filters Observations by a concept rather than by a ValueSet.  In CQL 1.3, this will be built into the retrieve,
 * but for now, we must use a query where clause.
 * @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
 * @returns {List<Observation>} a list of Observations matching the concept, or null if null was passed in
 */
define function ObservationsByConcept(Koncept System.Concept):
  [Observation] O where NullSafeToConcept(O.code) ~ Koncept

/**
 * Observations that are complete and verified. In FHIR R4, there are two statuses that indicate this state: 'final'
 * and 'amended'.
 * @see https://www.hl7.org/fhir/valueset-observation-status.html
 * @param ObsList - a list of Observations
 * @returns {List<Observation>} a list of verified Observations, or null if null was passed in
 */
define function Verified(ObsList List<Observation>):
  ObsList O where O.status.value in {'final', 'amended'}

/**
 * Observations that have quantity values recorded in the requested unit.
 * @param ObsList - a list of Observations
 * @param Unit - the unit to require in the Observations quantity value
 * @returns {List<Observation>} a list of Observations with the required unit, or null if null was passed in
 */
define function WithUnit(ObsList List<Observation>, Unit String):
  ObsList O where O.value.unit.value = Unit or O.value.code.value = Unit

/**
 * Observations with an effective or issued date in the specified "look back" period.  For example, LDL-C Tests in the
 * last 6 years.
 * TODO: Rename to LookBack once the execution engine supports overloaded functions.
 * @param ObsList - a list of Observations
 * @returns {List<Observation>} a list of Observations with effective or issued date specified lookback period, or null
 * if null was passed in
 */
define function ObservationLookBack(ObsList List<Observation>, LookBack System.Quantity):
  ObsList O
    let LookBackInterval: Interval[Now() - LookBack, Now()]
    where O.effective.value in LookBackInterval
      or NullSafeToInterval(O.effective) overlaps LookBackInterval
      or O.issued.value in LookBackInterval

/**
 * The most recent observation.  For each Observation, this algorithm will use the FindDate function, which uses the
 * first non-null date value from these fields: effectiveDateTime, effectivePeriod.end, effectivePeriod.start, issued.
 * The found date will be used to compare Observations and determine the most recent one.
 * @see FindDate(Observation)
 * @param ObsList - a list of Observations
 * @returns {Observation} the most recent Observation from the list, or null if null was passed in
 */
define function MostRecent(ObsList List<Observation>):
  Last(ObsList O sort by Coalesce(effective.value, effective."end".value, effective."start".value, issued.value))

/**
 * Extracts the quantity value from an Observation, returning it as a CQL Quantity
 * @param Obs - an observation
 * @returns {System.Quantity} the Observation's value as a quantity, or null if there is no quantity value
 */
define function QuantityValue(Obs Observation):
  NullSafeToQuantity(Obs.value)

/**
 * Extracts the CodeableConcept value from an Observation, returning it as a CQL Concept
 * @param Obs - an observation
 * @returns {System.Concept} the Observation's value as a concept, or null if there is no CodeabeConcept value
 */
define function ConceptValue(Obs Observation):
  NullSafeToConcept(Obs.value)

/**
 * Finds the first non-null meaningful date that can be associated with this Observation.  This will look through the
 * following fields in the following order: effectiveDateTime, effectivePeriod.end, effectivePeriod.start, issued.
 * @param Obs - an Observation
 * @returns {System.DateTime} the first non-null meaningful date, or null if non is found
 */
define function FindDate(Obs Observation):
  Coalesce(Obs.effective.value, Obs.effective."end".value, Obs.effective."start".value, Obs.issued.value)

// TODO: Confirm that this works as expected
/**
 * The highest observation.
 * The value will be used to compare Observations and determine the highest one.
 * @param ObsList - a list of Observations
 * @returns {System.Quantity} the quantity with the highest value from the list, or null if null was passed in
 */
define function HighestObservation(ObsList List<Observation>):
  Max(ObsList O return NullSafeToQuantity(O.value))


// -------------------------------------------------- CONDITIONS -------------------------------------------------------

/**
 * Filters Conditions by a concept rather than by a ValueSet.  In CQL 1.3, this will be built into the retrieve,
 * but for now, we must use a query where clause.
 * @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
 * @returns {List<Observation>} a list of Conditions matching the concept, or null if null was passed in
 */
define function ConditionsByConcept(Koncept System.Concept):
  [Condition] C where NullSafeToConcept(C.code) ~ Koncept

/**
 * Conditions that are confirmed. In FHIR R4, this is reflected by verificationStatus: 'confirmed'.
 * @see https://www.hl7.org/fhir/valueset-condition-ver-status.html
 * @param CondList - a list of Conditions
 * @returns {List<Condition>} a list of confirmed Conditions, or null if null was passed in
 */
define function Confirmed(CondList List<Condition>):
  CondList C where C.verificationStatus.coding ~ "Condition verificationStatus confirmed code"

/**
 * Conditions that are active. In FHIR R4, this is reflected by clinicalStatus: 'active' and the absence of any
 * abatement information (i.e., if it abated, it is no longer active).
 * TODO: Rename to Active once the execution engine supports overloaded functions.
 * @see https://www.hl7.org/fhir/valueset-condition-clinical.html
 * @param CondList - a list of Conditions
 * @returns {List<Condition>} a list of active Conditions, or null if null was passed in
 */
define function ActiveCondition(CondList List<Condition>):
  CondList C
    where C.clinicalStatus.coding ~ "Condition clinicalStatus active code"
      and C.abatement is null

/**
 * Conditions that are active or recurring. In FHIR R4, this is reflected by clinicalStatus: 'active', 'recurrence', or 'relapse'.
 * We do not check for null abatement information because it may have dates from when the now recurring condition
 * initially went into remission.
 * @see https://www.hl7.org/fhir/valueset-condition-clinical.html
 * @param CondList - a list of Conditions
 * @returns {List<Condition>} a list of active or recurring Conditions, or null if null was passed in
 */
define function ActiveOrRecurring(CondList List<Condition>):
  CondList C where C.clinicalStatus.coding ~ "Condition clinicalStatus active code"
    or C.clinicalStatus.coding ~ "Condition clinicalStatus recurrence code"
    or C.clinicalStatus.coding ~ "Condition clinicalStatus relapse code"

/**
 * Conditions with an onset or recorded date in the specified "look back" period.  For example, pregnancy in
 * the last 42 weeks.
 * TODO: Rename to LookBack once the execution engine supports overloaded functions.
 * @param CondList - a list of Conditions
 * @returns {List<Condition>} a list of Conditions with onset or recorded date specified lookback period, or null
 * if null was passed in
 */
define function ConditionLookBack(CondList List<Condition>, LookBack System.Quantity):
  CondList C
    let LookBackInterval: Interval[Now() - LookBack, Now()]
    where C.onset.value in LookBackInterval
      or NullSafeToInterval(C.onset) overlaps LookBackInterval
      or C.recordedDate.value in LookBackInterval
      // TODO Confirm these are the correct fields to use

// -------------------------------------------------- PROCEDURES -------------------------------------------------------

 /**
  * Filters Procedures by a concept rather than by a ValueSet.  In CQL 1.3, this will be built into the retrieve,
  * but for now, we must use a query where clause.
  * @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
  * @returns {List<Procedure>} a list of Procedures matching the concept, or null if null was passed in
  */
 define function ProceduresByConcept(Koncept System.Concept):
   [Procedure] P where NullSafeToConcept(P.code) ~ Koncept

/**
 * Procedures that are completed. In FHIR R4, this is reflected by status: 'completed'.  In addition, the
 * notDone flag must be checked to ensure it is not 'true'.
 * @see https://www.hl7.org/fhir/valueset-event-status.html
 * @param ProcList - a list of Procedures
 * @returns {List<Procedure>} a list of completed Procedures, or null if null was passed in
 */
define function Completed(ProcList List<Procedure>):
  ProcList P
    where P.status.value = 'completed'

/**
 * Procedures that are in progress. In FHIR R4, this is reflected by status: 'in-progress'.  In addition, the
 * notDone flag must be checked to ensure it is not 'true'.
 * @see https://www.hl7.org/fhir/valueset-event-status.html
 * @param ProcList - a list of Procedures
 * @returns {List<Procedure>} a list of completed Procedures, or null if null was passed in
 */
define function ProcedureInProgress(ProcList List<Procedure>):
  ProcList P
    where P.status.value = 'in-progress'

/**
 * Procedures that actually happened or are happening. In FHIR R4, there are a few properties that negate the
 * procedure, most notably when status is 'entered-in-error' or notDone is true.
 * @see https://www.hl7.org/fhir/valueset-event-status.html
 * @param ProcList - a list of Procedures
 * @returns {List<Procedure>} a list of Procedures that actually happened or are happening, or null if null was passed in
 */
define function ProcedurePerformance(ProcList List<Procedure>):
  ProcList P
    where P.status.value != 'entered-in-error'

/**
 * Procedures performed in the specified "look back" period.  For example, PCIs performed in the
 * past 2 weeks.
 * TODO: Rename to LookBack once the execution engine supports overloaded functions.
 * @param ProcList - a list of Procedures
 * @param LookBack - the lookback period for when the procedure was performed
 * @returns {List<Procedure>} a list of Procedures performed in the look back period, or null if null
 * was passed in
 */
define function ProcedureLookBack(ProcList List<Procedure>, LookBack System.Quantity):
  ProcList P
    let LookBackInterval: Interval[Now() - LookBack, Now()]
    where P.performed.value in LookBackInterval
      or NullSafeToInterval(P.performed) overlaps LookBackInterval

// Note: ProcedureRequest and ReferralRequest resources have been replaced in FHIR R4 with the ServiceRequest resource.
// TODO: When needed, come back and ServiceRequest helper functions.
// // ---------------------------------------------- PROCEDUREREQUESTS ----------------------------------------------------

//  /**
//   * Filters ProcedureRequests by a concept rather than by a ValueSet.  In CQL 1.3, this will be built into the retrieve,
//   * but for now, we must use a query where clause.
//   * @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
//   * @returns {List<ProcedureRequest>} a list of ProcedureRequests matching the concept, or null if null was passed in
//   */
//  define function ProcedureRequestsByConcept(Koncept System.Concept):
//    [ProcedureRequest] P where NullSafeToConcept(P.code) ~ Koncept

// /**
//  * ProcedureRequests that are accepted, in progress, or completed. In FHIR DSTU2, this is reflected by the corresponding
//  * status status values.
//  * @see http://hl7.org/fhir/DSTU2/valueset-procedure-request-status.html
//  * @param ProcReqList - a list of ProcedureRequests
//  * @returns {List<ProcedureRequest>} a list of accepted, in-progress, or completed ProcedureRequests,
//  * or null if null was passed in
//  */
// define function ProcedureRequestAcceptedOrInProgressOrCompleted(ProcReqList List<ProcedureRequest>):
//   ProcReqList P
//     where P.status.value in List{'accepted', 'in-progress', 'completed'}

// /**
//  * ProcedureRequests ordered in the specified "look back" period.  For example, PCIs ordered in the
//  * past 2 weeks.
//  * TODO: Rename to LookBack once the execution engine supports overloaded functions.
//  * @param ProcReqList - a list of ProcedureRequests
//  * @param LookBack - the lookback period for when the procedure was ordered
//  * @returns {List<ProcedureRequest>} a list of ProcedureRequests ordered in the look back period, or null if null
//  * was passed in
//  */
// define function ProcedureRequestLookBack(ProcReqList List<ProcedureRequest>, LookBack System.Quantity):
//   ProcReqList P
//     where P.authoredOn.value in Interval[Now() - LookBack, Now()]

// // ----------------------------------------------- REFERRALREQUESTS ----------------------------------------------------

//  /**
//   * Filters ReferralRequests by a concept rather than by a ValueSet.  In CQL 1.3, this will be built into the retrieve,
//   * but for now, we must use a query where clause.
//   * @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
//   * @returns {List<ReferralRequest>} a list of ReferralRequests matching the concept, or null if null was passed in
//   */
//  define function ReferralRequestsByServiceRequestedConcept(Koncept System.Concept):
//    [ReferralRequest] R
//    where exists((R.serviceRequested) SRC where NullSafeToConcept(SRC) ~ Koncept)

// /**
//  * ReferralRequests that are accepted, active, or completed. In FHIR DSTU2, this is reflected by the corresponding
//  * status status values.
//  * @see http://hl7.org/fhir/DSTU2/valueset-referralstatus.html
//  * @param ReferralList - a list of ReferralRequests
//  * @returns {List<ReferralRequest>} a list of accepted, active, or completed ReferralRequests,
//  * or null if null was passed in
//  */
// define function ReferralRequestAcceptedOrActiveOrCompleted(ReferralList List<ReferralRequest>):
//   ReferralList R
//     where R.status.value in List{'accepted', 'active', 'completed'}

// /**
//  * ReferralRequests requested in the specified "look back" period.  For example, pace make insertions referrals sent
//  * in the past 2 weeks.
//  * TODO: Rename to LookBack once the execution engine supports overloaded functions.
//  * @param ReferralList - a list of ReferralRequests
//  * @param LookBack - the lookback period for when the referral was sent
//  * @returns {List<ReferralRequest>} a list of ReferralRequests sent in the look back period, or null if null
//  * was passed in
//  */
// define function ReferralRequestLookBack(ReferralList List<ReferralRequest>, LookBack System.Quantity):
//   ReferralList R
//     where R.authoredOn.value in Interval[Now() - LookBack, Now()]

// -------------------------------------------------- MEDICATIONS ------------------------------------------------------

/**
 * Filters MedicationStatements by a concept rather than by a ValueSet.  In CQL 1.3, this will be built into the retrieve,
 * but for now, we must use a query where clause.
 * @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
 * @returns {List<MedicationStatement>} a list of MedicationStatement matching the concept, or null if null was passed in
 */
define function MedicationStatementsByConcept(Koncept System.Concept):
  [MedicationStatement] M where NullSafeToConcept(M.medication) ~ Koncept

/**
 * Filters MedicationRequests by a concept rather than by a ValueSet.  In CQL 1.3, this will be built into the retrieve,
 * but for now, we must use a query where clause.
 * @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
 * @returns {List<MedicationRequest>} a list of MedicationRequests matching the concept, or null if null was passed in
 */
define function MedicationRequestsByConcept(Koncept System.Concept):
  [MedicationRequest] M where NullSafeToConcept(M.medication) ~ Koncept

/**
 * Medications that are active, according to a statement, but not necessarily verified via a prescription.  For example,
 * medications that a patient has self-reported to be taking.  In FHIR R4, this is reflected by MedicationStatement
 * with status 'active', no flag indicating it wasn't taken, and no end date or an end date in the future.
 * TODO: Rename to Active once the execution engine supports overloaded functions.
 * @see https://www.hl7.org/fhir/valueset-medication-statement-status.html
 * @param MedList - a list of MedicationStatements
 * @returns {List<MedicationStatement>} a list of active medication statements, or null if null was passed in
 */
define function ActiveMedicationStatement(MedList List<MedicationStatement>):
  MedList M
    let EffectivePeriod: NullSafeToInterval(M.effective)
    where M.status.value = 'active'
      and (end of EffectivePeriod is null or end of EffectivePeriod after Now())

/**
 * Medications that are active or completed, according to a statement, but not necessarily verified via a prescription.
 * For example, medications that a patient has self-reported to be taking.  In FHIR R4, this is reflected by
 * MedicationStatement with status 'active' or 'completed', and no flag indicating it wasn't taken.
 * TODO: Rename to ActiveOrCompleted once the execution engine supports overloaded functions.
 * @see https://www.hl7.org/fhir/valueset-medication-statement-status.html
 * @param MedList - a list of MedicationStatements
 * @returns {List<MedicationStatement>} a list of active or completed medication statements, or null if null was passed
 *   in
 */
define function ActiveOrCompletedMedicationStatement(MedList List<MedicationStatement>):
  MedList M
    where M.status.value = 'active'
      or M.status.value = 'completed'

/**
* Medications that are active, according to a prescription.  In FHIR R4, this is reflected by MedicationRequest
* with status 'active' and no dateEnded.  There is currently an open question in the FHIR chat to determine if this
* is the right approach.
* @see https://www.hl7.org/fhir/valueset-medicationrequest-status.html
* @param MedList - a list of MedicationRequests
* @returns {List<MedicationRequest>} a list of active medication orders, or null if null was passed in
*/
define function ActiveMedicationRequest(MedList List<MedicationRequest>):
  MedList M
    where M.status.value = 'active'

/**
* Medications that are active or completed, according to a prescription.  In FHIR R4, this is reflected by MedicationRequest
* with status 'active' or 'completed'
* @see https://www.hl7.org/fhir/valueset-medicationrequest-status.html
* @param MedList - a list of MedicationRequests
* @returns {List<MedicationRequest>} a list of active medication orders, or null if null was passed in
*/
define function ActiveOrCompletedMedicationRequest(MedList List<MedicationRequest>):
  MedList M
    where M.status.value = 'active'
      or M.status.value = 'completed'

/**
* Medications that are active, completed, or stopped, according to a prescription.  In FHIR R4, this is reflected by
* MedicationRequest with status 'active', 'completed', or 'stopped'
* @see https://www.hl7.org/fhir/valueset-medicationrequest-status.html
* @param MedList - a list of MedicationRequests
* @returns {List<MedicationRequest>} a list of active medication orders, or null if null was passed in
*/
define function ActiveCompletedOrStoppedMedicationRequest(MedList List<MedicationRequest>):
  MedList M
    where M.status.value = 'active'
      or M.status.value = 'completed'
      or M.status.value = 'stopped'

/**
 * MedicationStatement with an effective date in the specified "look back" period.  For example, statements about opioid
 * use in the last 180 days.
 * TODO: Rename to LookBack once the execution engine supports overloaded functions.
 * @param MedList - a list of MedicationStatements
 * @param LookBack - a duration Quantity indicating how far back to look for MedicationStatements
 * @returns {List<MedicationStatement>} a list of MedicationStatements with effective date in the specified lookback
 * period, or null if null was passed in
 */
define function MedicationStatementLookBack(MedList List<MedicationStatement>, LookBack System.Quantity):
  MedList M
    let LookBackInterval: Interval[Now() - LookBack, Now()]
    where M.effective.value in LookBackInterval
      or NullSafeToInterval(M.effective) overlaps LookBackInterval

/**
 * MedicationRequests with a written date in the specified "look back" period.  For example, opioid orders in the last
 * 180 days.
 * TODO: Rename to LookBack once the execution engine supports overloaded functions.
 * @param OrderList - a list of MedicationRequests
 * @param LookBack - a duration Quantity indicating how far back to look for MedicationRequests
 * @returns {List<MedicationRequest>} a list of MedicationRequests with written date in the specified lookback period,
 * or null if null was passed in
 */
define function MedicationRequestLookBack(MedList List<MedicationRequest>, LookBack System.Quantity):
  MedList M where M.authoredOn.value in Interval[Now() - LookBack, Now()]

// -------------------------------------------------- ENCOUNTERS ------------------------------------------------------

/**
 * Filters Encounters by a concept rather than by a ValueSet.  In CQL 1.3, this will be built into the retrieve,
 * but for now, we must use a query where clause.
 * @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
 * @returns {List<Encounter>} a list of Encounters matching the concept, or null if null was passed in
 */
define function EncountersByConcept(Koncept System.Concept):
  [Encounter] E where exists( (E.type) ET where NullSafeToConcept(ET) ~ Koncept )

/**
 * Encounters that are in progress. In FHIR R4, this is reflected by status: 'in-progress'.
 * @see https://www.hl7.org/fhir/valueset-encounter-status.html
 * @param EncList - a list of Encounters
 * @returns {List<Encounter>} a list of in progress encounters, or null if null was passed in
 */
define function InProgress(EncList List<Encounter>):
  EncList E
    where E.status.value = 'in-progress'

/**
 * Encounters that have not been cancelled. In FHIR R4, this is reflected by  andy status other 
 * than: 'cancelled'.
 * @see https://www.hl7.org/fhir/valueset-encounter-status.html
 * @param EncList - a list of Encounters
 * @returns {List<Encounter>} a list of in progress encounters, or null if null was passed in
 */
define function NotCancelled(EncList List<Encounter>):
  EncList E
    where E.status.value != 'cancelled'

/**
 * Encounters performed in the specified "look back" period.
 * TODO: Rename to LookBack once the execution engine supports overloaded functions.
 * @param EncList - a list of Encounters
 * @param LookBack - the lookback period for when the encounter occurred
 * @returns {List<Encounter>} a list of Encounters occurring during the look back period, or null if null
 * was passed in
 */
define function EncounterLookBack(EncList List<Encounter>, LookBack System.Quantity):
  EncList E
    let LookBackInterval: Interval[Now() - LookBack, Now()]
    where NullSafeToInterval(E.period) overlaps LookBackInterval

// -------------------------------------------------- ALLERGY INTOLERANCES ---------------------------------------------

/**
 * Filters AllergyIntolerances by a concept rather than by a ValueSet.  In CQL 1.3, this will be built into the retrieve,
 * but for now, we must use a query where clause.
 * @param Koncept - the concept to filter on (intentionally mispelled to avoid naming clashes)
 * @returns {List<AllergyIntolerance>} a list of Allergy Intolerances matching the concept, or null if null was passed in
 */
define function AllergyIntolerancesByConcept(Koncept System.Concept):
  [AllergyIntolerance] A where NullSafeToConcept(A.code) ~ Koncept

/**
* AllergyIntolerances that are active or confirmed.  In FHIR R4, this is reflected by AllergyIntolerance
* with verificationStatus 'active' or 'confirmed'
* @see https://www.hl7.org/fhir/valueset-allergyintolerance-verification.html
* @param AllergyIntolList - a list of AllergyIntolerances
* @returns {List<AllergyIntolerance>} a list of active or confirmed allergy intolerances, or null if null was passed in
*/
define function ConfirmedAllergyIntolerance(AllergyIntolList List<AllergyIntolerance>):
  AllergyIntolList A
    where A.verificationStatus.coding ~ "AllergyIntolerance verificationStatus confirmed code"

// -------------------------------------------------------- GOALS ------------------------------------------------------

/**
 * Goals with a start, target, or status date in the specified "look back" period.  For example, Pain Management Goals
 * in the last 2 years.
 * TODO: Rename to LookBack once the execution engine supports overloaded functions.
 * @param GoalList - a list of Goals
 * @returns {List<Goal>} a list of Goals with a start, target, or status date in the specified lookback period, or null
 * if null was passed in
 */
define function GoalLookBack(GoalList List<Goal>, LookBack System.Quantity):
  GoalList G
    let LookBackInterval: Interval[Now() - LookBack, Now()]
    where G.start.value in LookBackInterval
      or G.target.dueD in LookBackInterval
      or G.start.value in LookBackInterval
      or G.statusDate.value in LookBackInterval
"/>
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