Clinical Practice Guidelines
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Clinical Practice Guidelines, published by HL7 International - Clinical Decision Support WG. This is not an authorized publication; it is the continuous build for version 1.0.0). This version is based on the current content of https://github.com/HL7/cqf-recommendations/ and changes regularly. See the Directory of published versions

: Opioid CDS R4 Common Logic - XML Representation

Active as of 2018-03-25

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<Library xmlns="http://hl7.org/fhir">
  <id value="OpioidCDSR4Common"/>
  <text>
    <status value="generated"/>
    <div xmlns="http://www.w3.org/1999/xhtml"><h2>Participants</h2><table class="grid"><tr><td>Author</td><td>Kensaku Kawamoto, MD, PhD, MHS</td></tr><tr><td>Author</td><td>Bryn Rhodes</td></tr><tr><td>Author</td><td>Floyd Eisenberg, MD, MPH</td></tr><tr><td>Author</td><td>Robert McClure, MD, MPH</td></tr></table><h2>Related Artifacts</h2><table class="grid"><tr><td>documentation</td><td>CDC guideline for prescribing opioids for chronic pain</td><td>https://www.cdc.gov/mmwr/volumes/65/rr/rr6501e1.htm?CDC_AA_refVal=https%3A%2F%2Fwww.cdc.gov%2Fmmwr%2Fvolumes%2F65%2Frr%2Frr6501e1er.htm</td></tr></table><h2>Contents</h2><p><code>text/cql</code></p><pre><code class="language-sql">library OpioidCDSR4Common version '0.1.0'

using FHIR version '4.0.0'

include FHIRHelpers version '4.0.0' called FHIRHelpers
include OMTKLogic version '0.0.0' called OMTKLogic

codesystem &quot;SNOMED&quot;: 'http://snomed.info/sct'
codesystem &quot;Medication Request Category Codes&quot;: 'http://terminology.hl7.org/CodeSystem/medicationrequest-category'

valueset &quot;Active Condition&quot;: 'http://hl7.org/fhir/uv/cpg/ValueSet/cpg-active-condition'
valueset &quot;Benzodiazepines&quot;: 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/benzodiazepines'
// TODO: Fix this name
valueset &quot;End of Life Conditions&quot;: 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/end-of-life-conditions'
// Harvested from VSAC - OID: 2.16.840.1.113762.1.4.1108.15
// NOTE: This harvest note is incorrect, none of the following 3 value sets contain any of the codes in the above referenced valueset
// Rob will construct an appropriate hospice value set aligned with current eCQM program usage and we will use that when available
valueset &quot;Hospice Disposition&quot;: 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/hospice-disposition'
valueset &quot;Hospice Finding Codes&quot;: 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/hospice-finding'
valueset &quot;Hospice Procedure Codes&quot;: 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/hospice-procedure'
valueset &quot;Illicit Drug Screening&quot;: 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/illicit-drug-urine-screening'
// Harvested from VSAC - OID: 2.16.840.1.113883.3.526.3.1259
valueset &quot;Limited Life Expectancy Conditions&quot;: 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/limited-life-expectancy-conditions'
valueset &quot;Long Acting Opioids&quot;: 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/long-acting-opioids'
valueset &quot;Naloxone&quot;: 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/naloxone'
valueset &quot;Risk Assessment&quot;: 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/opioid-abuse-assessment'
valueset &quot;Opioid Drug Screening&quot;: 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/opioid-urine-screening'
valueset &quot;Ambulatory Abuse Potential Opioids&quot;: 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/opioids-abused-in-ambulatory-care'
valueset &quot;Substance Abuse&quot;: 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/substance-abuse'

// TODO: Turn this into a valueset
code &quot;Referral to Hospice&quot;: '306205009' from &quot;SNOMED&quot;
// TODO: Turn this into a valueset
code &quot;Outpatient&quot;: 'outpatient' from &quot;Medication Request Category Codes&quot;

// TODO: Capture process decisions for long-term opioid use
define IsForChronicPain: true

define &quot;Active Ambulatory Opioid Rx&quot;:
  [MedicationRequest: &quot;Ambulatory Abuse Potential Opioids&quot;] Rx
    where Rx.status = 'active'
      and ToCodes(Rx.category.coding) contains &quot;Outpatient&quot;

define &quot;Active Ambulatory Benzodiazepine Rx&quot;:
  [MedicationRequest: &quot;Benzodiazepines&quot;] Rx
    where Rx.status = 'active'
      and ToCodes(Rx.category.coding) contains &quot;Outpatient&quot;

define &quot;Active Ambulatory Naloxone Rx&quot;:
  [MedicationRequest: &quot;Naloxone&quot;] Rx
    where Rx.status = 'active'
      and ToCodes(Rx.category.coding) contains &quot;Outpatient&quot;

define &quot;Ambulatory Opioid Rx&quot;:
  [MedicationRequest: &quot;Ambulatory Abuse Potential Opioids&quot;] Rx
      where ToCodes(Rx.category.coding) contains &quot;Outpatient&quot;

define &quot;End of Life Assessment&quot;:
  // 1. Conditions indicating end of life or with limited life expectancy
  exists (
    (
      [Condition: &quot;End of Life Conditions&quot;] C
        where C.clinicalStatus in &quot;Active Condition&quot;
    )
    union
    (
      [Condition: code in &quot;Limited Life Expectancy Conditions&quot;] C
        where C.clinicalStatus in &quot;Active Condition&quot;
    )
  )
  // 2. Admitted/referred/discharged to hospice care
  or exists (
    (
      [ServiceRequest: code in &quot;Referral to Hospice&quot;] RR
        where RR.status in { 'active', 'completed' }
    )
    union
    (
      [ServiceRequest: code in &quot;Hospice Procedure Codes&quot;] P
        where P.status in { 'in-progress', 'completed' }
    )
    union
    (
      [ServiceRequest: code in &quot;Hospice Procedure Codes&quot;] E
        where E.status in { 'planned', 'arrived', 'in-progress', 'finished', 'onleave' }
    )
    union
    (
      [Observation: code in &quot;Hospice Finding Codes&quot;] O
        where not (O.status in { 'unknown', 'entered-in-error', 'cancelled' })
    )
    union
    (
      [Encounter] E
        where
          (
            if E.hospitalization.dischargeDisposition.coding is null
                or not exists (E.hospitalization.dischargeDisposition.coding)
              then false
            else E.hospitalization.dischargeDisposition in &quot;Hospice Disposition&quot;
          )
          and E.status in { 'planned', 'arrived', 'in-progress', 'finished', 'onleave' }
    )
  )

define function Prescriptions(Orders List&lt;MedicationRequest&gt;):
  Orders O
    let
      // NOTE: Assuming medication is specified as a CodeableConcept with a single RxNorm code
      rxNormCode: ToCode(O.medication.coding[0]),
      medicationName: OMTKLogic.GetMedicationName(rxNormCode),
      // NOTE: Assuming a single dosage instruction element
      dosageInstruction: O.dosageInstruction[0],
      repeat: dosageInstruction.timing.repeat,
      frequency: Coalesce(repeat.frequencyMax.value, repeat.frequency.value),
      period: System.Quantity { value: repeat.period.value, unit: repeat.periodUnit.value },
      doseDescription:
        Coalesce(
          // There should be a conversion from FHIR.SimpleQuantity to System.Quantity
          if dosageInstruction.doseAndRate[0].dose is FHIR.Range
            then ToString(ToQuantity(dosageInstruction.doseAndRate[0].dose.low))
                          + '-' + ToString(ToQuantity(dosageInstruction.doseAndRate[0].dose.high))
                          + dosageInstruction.doseAndRate[0].dose.high.unit.value
            else ToString(ToQuantity(dosageInstruction.doseAndRate[0].dose)),
            ''
        ),
      frequencyDescription:
        ToString(dosageInstruction.timing.repeat.frequency.value) +
          Coalesce(
            '-' + ToString(dosageInstruction.timing.repeat.frequencyMax.value),
            ''
          )
    return {
      rxNormCode: rxNormCode,
      isDraft: O.status.value = 'draft',
      // NOTE: Assuming asNeeded is expressed as a boolean
      isPRN: dosageInstruction.asNeeded.value,
      prescription:
        if dosageInstruction.text is not null then
          medicationName + ' ' + dosageInstruction.text.value
        else
          // TODO: Shouldn't need the .value here on asNeededBoolean
          medicationName + ' ' + doseDescription + ' q' + frequencyDescription + (if dosageInstruction.asNeeded.value then ' PRN' else ''),
      // TODO: Shouldn't need the ToQuantity here...
      dose: if dosageInstruction.doseAndRate[0].dose is FHIR.Range
            then ToQuantity(dosageInstruction.doseAndRate[0].dose.high)
            else ToQuantity(dosageInstruction.doseAndRate[0].dose),
      dosesPerDay: Coalesce(OMTKLogic.ToDaily(frequency, period), 1.0)
    }

define function MME(prescriptions List&lt;MedicationRequest&gt;):
  (Prescriptions(prescriptions)) P
    let mme: SingletonFrom(OMTKLogic.CalculateMMEs({ { rxNormCode: P.rxNormCode, doseQuantity: P.dose, dosesPerDay: P.dosesPerDay } }))
    return {
      rxNormCode: P.rxNormCode,
      isDraft: P.isDraft,
      isPRN: P.isPRN,
      prescription: P.prescription,
      dailyDose: mme.dailyDoseDescription,
      conversionFactor: mme.conversionFactor,
      mme: mme.mme
    }

define function TotalMME(prescriptions List&lt;MedicationRequest&gt;):
  System.Quantity {
    value: Sum((MME(prescriptions)) M return M.mme.value),
    unit: 'mg/d'
  }

define function ProbableDaysInRange(Orders List&lt;MedicationRequest&gt;, daysPast Integer, numDaysInDaysPast Integer):
  Orders orders
    let
      frequency: orders.dosageInstruction[0].timing.repeat.frequency.value,
      period: orders.dosageInstruction[0].timing.repeat.period.value,
      periodDays: GetPeriodDays(orders.dosageInstruction[0].timing.repeat.periodUnit.value),
      dosesPerDay:
        if (frequency / (period * periodDays)) &gt;= 1.0
        then 1.0
        else frequency / (period * periodDays),
      repeat: orders.dispenseRequest.numberOfRepeatsAllowed.value,
      supplyDuration: GetDurationInDays(orders.dispenseRequest.expectedSupplyDuration),
      validityPeriod: days between orders.dispenseRequest.validityPeriod.&quot;start&quot;.value and Today(),
      endDifference:
        if orders.dispenseRequest.validityPeriod.&quot;end&quot;.value &lt; Today()
        then days between orders.dispenseRequest.validityPeriod.&quot;end&quot;.value and Today()
        else 0
    return
      if (repeat * supplyDuration) &lt; numDaysInDaysPast then false
      else
        (dosesPerDay * ((repeat * supplyDuration) / validityPeriod) * (daysPast - endDifference)) &gt;= numDaysInDaysPast

define function GetPeriodDays(value System.String):
  case
    when value = 'a' then 365.0
    when value = 'mo' then 30.0
    when value = 'h' then 1.0/24.0
    when value = 'min' then 1.0/24.0*60.0
    when value = 's' then 1.0/24.0*60.0*60.0
    when value = 'ms' then 1.0/24.0*60.0*60.0*1000.0
    else 1.0
  end

  define function GetDurationInDays(value FHIR.Duration):
    case
      when StartsWith(value.unit.value, 'a') then value.value.value * 365.0
      when StartsWith(value.unit.value, 'mo') then value.value.value * 30.0
      when StartsWith(value.unit.value, 'wk') then value.value.value * 7.0
      when StartsWith(value.unit.value, 'd') then value.value.value
      when StartsWith(value.unit.value, 'h') then value.value.value / 24.0
      when StartsWith(value.unit.value, 'min') then value.value.value / 60.0 / 24.0
      when StartsWith(value.unit.value, 's') then value.value.value / 60.0 / 60.0 / 24.0
      when StartsWith(value.unit.value, 'ms') then value.value.value / 60.0 / 60.0 / 24.0 / 1000.0
      else Message(1000, true, 'Undefined', 'Error', 'Unsupported duration unit')
    end

define function GetIngredient(rxNormCode Code):
  OMTKLogic.GetIngredients(rxNormCode).ingredientName

define function GetIngredients(rxNormCodes List&lt;Code&gt;):
  rxNormCodes rnc return GetIngredient(rnc)

define function GetMedicationNames(medications List&lt;MedicationRequest&gt;):
  medications M
    return OMTKLogic.GetIngredients(ToRxNormCode(M.medication.coding)).rxNormCode.display

/*
*  Conversion Functions
*/

define function ToCode(coding FHIR.Coding):
  System.Code {
    code: coding.code.value,
    system: coding.system.value,
    version: coding.version.value,
    display: coding.display.value
  }

define function ToCodes(coding List&lt;FHIR.Coding&gt;):
  coding c return ToCode(c)

define function ToRxNormCode(coding List&lt;FHIR.Coding&gt;):
  singleton from (
    coding C where C.system = 'http://www.nlm.nih.gov/research/umls/rxnorm'
  )

define function ToQuantity(quantity FHIR.Quantity):
  System.Quantity { value: quantity.value.value, unit: quantity.unit.value }
</code></pre><p><code>No Content</code> (<code>application/elm+xml</code>)</p></div>
  </text>
  <url
       value="http://fhir.org/guides/cdc/opioid-cds/Library/OpioidCDSR4Common"/>
  <version value="1.0.0"/>
  <name value="OpioidCDSR4Common"/>
  <title value="Opioid CDS R4 Common Logic"/>
  <status value="active"/>
  <experimental value="true"/>
  <type>
    <coding>
      <system value="http://terminology.hl7.org/CodeSystem/library-type"/>
      <code value="logic-library"/>
      <display value="Logic Library"/>
    </coding>
  </type>
  <date value="2018-03-25T13:49:09-06:00"/>
  <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="Common Opioid Decision Support Logic for use in implementing CDC Opioid Prescribing Guidelines."/>
  <useContext>
    <code>
      <system
              value="http://terminology.hl7.org/CodeSystem/usage-context-type"/>
      <code value="focus"/>
      <display value="Clinical Focus"/>
    </code>
    <valueCodeableConcept>
      <coding>
        <system value="http://snomed.info/sct"/>
        <code value="182888003"/>
        <display value="Medication requested (situation)"/>
      </coding>
    </valueCodeableConcept>
  </useContext>
  <useContext>
    <code>
      <system
              value="http://terminology.hl7.org/CodeSystem/usage-context-type"/>
      <code value="focus"/>
      <display value="Clinical Focus"/>
    </code>
    <valueCodeableConcept>
      <coding>
        <system value="http://snomed.info/sct"/>
        <code value="82423001"/>
        <display value="Chronic pain (finding)"/>
      </coding>
    </valueCodeableConcept>
  </useContext>
  <jurisdiction>
    <coding>
      <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/>
      <code value="001"/>
      <display value="World"/>
    </coding>
  </jurisdiction>
  <purpose
           value="This library contains common logic across recommendations including MME calculations, conversions, and looking up codes in valuesets."/>
  <usage
         value="This library is used for decision support for opioid guideline recommendations when applying PlanDefinitions."/>
  <copyright value="© CDC 2016+."/>
  <topic>
    <text value="Opioid Prescribing"/>
  </topic>
  <author>
    <name value="Kensaku Kawamoto, MD, PhD, MHS"/>
  </author>
  <author>
    <name value="Bryn Rhodes"/>
  </author>
  <author>
    <name value="Floyd Eisenberg, MD, MPH"/>
  </author>
  <author>
    <name value="Robert McClure, MD, MPH"/>
  </author>
  <relatedArtifact>
    <type value="documentation"/>
    <display value="CDC guideline for prescribing opioids for chronic pain"/>
    <url
         value="https://www.cdc.gov/mmwr/volumes/65/rr/rr6501e1.htm?CDC_AA_refVal=https%3A%2F%2Fwww.cdc.gov%2Fmmwr%2Fvolumes%2F65%2Frr%2Frr6501e1er.htm"/>
    <document>
      <url
           value="https://www.cdc.gov/mmwr/volumes/65/rr/rr6501e1.htm?CDC_AA_refVal=https%3A%2F%2Fwww.cdc.gov%2Fmmwr%2Fvolumes%2F65%2Frr%2Frr6501e1er.htm"/>
    </document>
  </relatedArtifact>
  <content>
    <contentType value="text/cql"/>
    <data
          value="library OpioidCDSR4Common version '0.1.0'

using FHIR version '4.0.0'

include FHIRHelpers version '4.0.0' called FHIRHelpers
include OMTKLogic version '0.0.0' called OMTKLogic

codesystem "SNOMED": 'http://snomed.info/sct'
codesystem "Medication Request Category Codes": 'http://terminology.hl7.org/CodeSystem/medicationrequest-category'

valueset "Active Condition": 'http://hl7.org/fhir/uv/cpg/ValueSet/cpg-active-condition'
valueset "Benzodiazepines": 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/benzodiazepines'
// TODO: Fix this name
valueset "End of Life Conditions": 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/end-of-life-conditions'
// Harvested from VSAC - OID: 2.16.840.1.113762.1.4.1108.15
// NOTE: This harvest note is incorrect, none of the following 3 value sets contain any of the codes in the above referenced valueset
// Rob will construct an appropriate hospice value set aligned with current eCQM program usage and we will use that when available
valueset "Hospice Disposition": 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/hospice-disposition'
valueset "Hospice Finding Codes": 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/hospice-finding'
valueset "Hospice Procedure Codes": 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/hospice-procedure'
valueset "Illicit Drug Screening": 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/illicit-drug-urine-screening'
// Harvested from VSAC - OID: 2.16.840.1.113883.3.526.3.1259
valueset "Limited Life Expectancy Conditions": 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/limited-life-expectancy-conditions'
valueset "Long Acting Opioids": 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/long-acting-opioids'
valueset "Naloxone": 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/naloxone'
valueset "Risk Assessment": 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/opioid-abuse-assessment'
valueset "Opioid Drug Screening": 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/opioid-urine-screening'
valueset "Ambulatory Abuse Potential Opioids": 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/opioids-abused-in-ambulatory-care'
valueset "Substance Abuse": 'http://fhir.org/guides/cdc/opioid-cds/ValueSet/substance-abuse'

// TODO: Turn this into a valueset
code "Referral to Hospice": '306205009' from "SNOMED"
// TODO: Turn this into a valueset
code "Outpatient": 'outpatient' from "Medication Request Category Codes"

// TODO: Capture process decisions for long-term opioid use
define IsForChronicPain: true

define "Active Ambulatory Opioid Rx":
  [MedicationRequest: "Ambulatory Abuse Potential Opioids"] Rx
    where Rx.status = 'active'
      and ToCodes(Rx.category.coding) contains "Outpatient"

define "Active Ambulatory Benzodiazepine Rx":
  [MedicationRequest: "Benzodiazepines"] Rx
    where Rx.status = 'active'
      and ToCodes(Rx.category.coding) contains "Outpatient"

define "Active Ambulatory Naloxone Rx":
  [MedicationRequest: "Naloxone"] Rx
    where Rx.status = 'active'
      and ToCodes(Rx.category.coding) contains "Outpatient"

define "Ambulatory Opioid Rx":
  [MedicationRequest: "Ambulatory Abuse Potential Opioids"] Rx
      where ToCodes(Rx.category.coding) contains "Outpatient"

define "End of Life Assessment":
  // 1. Conditions indicating end of life or with limited life expectancy
  exists (
    (
      [Condition: "End of Life Conditions"] C
        where C.clinicalStatus in "Active Condition"
    )
    union
    (
      [Condition: code in "Limited Life Expectancy Conditions"] C
        where C.clinicalStatus in "Active Condition"
    )
  )
  // 2. Admitted/referred/discharged to hospice care
  or exists (
    (
      [ServiceRequest: code in "Referral to Hospice"] RR
        where RR.status in { 'active', 'completed' }
    )
    union
    (
      [ServiceRequest: code in "Hospice Procedure Codes"] P
        where P.status in { 'in-progress', 'completed' }
    )
    union
    (
      [ServiceRequest: code in "Hospice Procedure Codes"] E
        where E.status in { 'planned', 'arrived', 'in-progress', 'finished', 'onleave' }
    )
    union
    (
      [Observation: code in "Hospice Finding Codes"] O
        where not (O.status in { 'unknown', 'entered-in-error', 'cancelled' })
    )
    union
    (
      [Encounter] E
        where
          (
            if E.hospitalization.dischargeDisposition.coding is null
                or not exists (E.hospitalization.dischargeDisposition.coding)
              then false
            else E.hospitalization.dischargeDisposition in "Hospice Disposition"
          )
          and E.status in { 'planned', 'arrived', 'in-progress', 'finished', 'onleave' }
    )
  )

define function Prescriptions(Orders List<MedicationRequest>):
  Orders O
    let
      // NOTE: Assuming medication is specified as a CodeableConcept with a single RxNorm code
      rxNormCode: ToCode(O.medication.coding[0]),
      medicationName: OMTKLogic.GetMedicationName(rxNormCode),
      // NOTE: Assuming a single dosage instruction element
      dosageInstruction: O.dosageInstruction[0],
      repeat: dosageInstruction.timing.repeat,
      frequency: Coalesce(repeat.frequencyMax.value, repeat.frequency.value),
      period: System.Quantity { value: repeat.period.value, unit: repeat.periodUnit.value },
      doseDescription:
        Coalesce(
          // There should be a conversion from FHIR.SimpleQuantity to System.Quantity
          if dosageInstruction.doseAndRate[0].dose is FHIR.Range
            then ToString(ToQuantity(dosageInstruction.doseAndRate[0].dose.low))
                          + '-' + ToString(ToQuantity(dosageInstruction.doseAndRate[0].dose.high))
                          + dosageInstruction.doseAndRate[0].dose.high.unit.value
            else ToString(ToQuantity(dosageInstruction.doseAndRate[0].dose)),
            ''
        ),
      frequencyDescription:
        ToString(dosageInstruction.timing.repeat.frequency.value) +
          Coalesce(
            '-' + ToString(dosageInstruction.timing.repeat.frequencyMax.value),
            ''
          )
    return {
      rxNormCode: rxNormCode,
      isDraft: O.status.value = 'draft',
      // NOTE: Assuming asNeeded is expressed as a boolean
      isPRN: dosageInstruction.asNeeded.value,
      prescription:
        if dosageInstruction.text is not null then
          medicationName + ' ' + dosageInstruction.text.value
        else
          // TODO: Shouldn't need the .value here on asNeededBoolean
          medicationName + ' ' + doseDescription + ' q' + frequencyDescription + (if dosageInstruction.asNeeded.value then ' PRN' else ''),
      // TODO: Shouldn't need the ToQuantity here...
      dose: if dosageInstruction.doseAndRate[0].dose is FHIR.Range
            then ToQuantity(dosageInstruction.doseAndRate[0].dose.high)
            else ToQuantity(dosageInstruction.doseAndRate[0].dose),
      dosesPerDay: Coalesce(OMTKLogic.ToDaily(frequency, period), 1.0)
    }

define function MME(prescriptions List<MedicationRequest>):
  (Prescriptions(prescriptions)) P
    let mme: SingletonFrom(OMTKLogic.CalculateMMEs({ { rxNormCode: P.rxNormCode, doseQuantity: P.dose, dosesPerDay: P.dosesPerDay } }))
    return {
      rxNormCode: P.rxNormCode,
      isDraft: P.isDraft,
      isPRN: P.isPRN,
      prescription: P.prescription,
      dailyDose: mme.dailyDoseDescription,
      conversionFactor: mme.conversionFactor,
      mme: mme.mme
    }

define function TotalMME(prescriptions List<MedicationRequest>):
  System.Quantity {
    value: Sum((MME(prescriptions)) M return M.mme.value),
    unit: 'mg/d'
  }

define function ProbableDaysInRange(Orders List<MedicationRequest>, daysPast Integer, numDaysInDaysPast Integer):
  Orders orders
    let
      frequency: orders.dosageInstruction[0].timing.repeat.frequency.value,
      period: orders.dosageInstruction[0].timing.repeat.period.value,
      periodDays: GetPeriodDays(orders.dosageInstruction[0].timing.repeat.periodUnit.value),
      dosesPerDay:
        if (frequency / (period * periodDays)) >= 1.0
        then 1.0
        else frequency / (period * periodDays),
      repeat: orders.dispenseRequest.numberOfRepeatsAllowed.value,
      supplyDuration: GetDurationInDays(orders.dispenseRequest.expectedSupplyDuration),
      validityPeriod: days between orders.dispenseRequest.validityPeriod."start".value and Today(),
      endDifference:
        if orders.dispenseRequest.validityPeriod."end".value < Today()
        then days between orders.dispenseRequest.validityPeriod."end".value and Today()
        else 0
    return
      if (repeat * supplyDuration) < numDaysInDaysPast then false
      else
        (dosesPerDay * ((repeat * supplyDuration) / validityPeriod) * (daysPast - endDifference)) >= numDaysInDaysPast

define function GetPeriodDays(value System.String):
  case
    when value = 'a' then 365.0
    when value = 'mo' then 30.0
    when value = 'h' then 1.0/24.0
    when value = 'min' then 1.0/24.0*60.0
    when value = 's' then 1.0/24.0*60.0*60.0
    when value = 'ms' then 1.0/24.0*60.0*60.0*1000.0
    else 1.0
  end

  define function GetDurationInDays(value FHIR.Duration):
    case
      when StartsWith(value.unit.value, 'a') then value.value.value * 365.0
      when StartsWith(value.unit.value, 'mo') then value.value.value * 30.0
      when StartsWith(value.unit.value, 'wk') then value.value.value * 7.0
      when StartsWith(value.unit.value, 'd') then value.value.value
      when StartsWith(value.unit.value, 'h') then value.value.value / 24.0
      when StartsWith(value.unit.value, 'min') then value.value.value / 60.0 / 24.0
      when StartsWith(value.unit.value, 's') then value.value.value / 60.0 / 60.0 / 24.0
      when StartsWith(value.unit.value, 'ms') then value.value.value / 60.0 / 60.0 / 24.0 / 1000.0
      else Message(1000, true, 'Undefined', 'Error', 'Unsupported duration unit')
    end

define function GetIngredient(rxNormCode Code):
  OMTKLogic.GetIngredients(rxNormCode).ingredientName

define function GetIngredients(rxNormCodes List<Code>):
  rxNormCodes rnc return GetIngredient(rnc)

define function GetMedicationNames(medications List<MedicationRequest>):
  medications M
    return OMTKLogic.GetIngredients(ToRxNormCode(M.medication.coding)).rxNormCode.display

/*
*  Conversion Functions
*/

define function ToCode(coding FHIR.Coding):
  System.Code {
    code: coding.code.value,
    system: coding.system.value,
    version: coding.version.value,
    display: coding.display.value
  }

define function ToCodes(coding List<FHIR.Coding>):
  coding c return ToCode(c)

define function ToRxNormCode(coding List<FHIR.Coding>):
  singleton from (
    coding C where C.system = 'http://www.nlm.nih.gov/research/umls/rxnorm'
  )

define function ToQuantity(quantity FHIR.Quantity):
  System.Quantity { value: quantity.value.value, unit: quantity.unit.value }
"/>
  </content>
  <content>
    <contentType value="application/elm+xml"/>
  </content>
</Library>