Da Vinci - Coverage Requirements Discovery
2.2.1 - STU 2.2

Da Vinci - Coverage Requirements Discovery, published by HL7 International / Financial Management. This guide is not an authorized publication; it is the continuous build for version 2.2.1 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/davinci-crd/ and changes regularly. See the Directory of published versions

## Data Type Profile: CDS Hooks Service Response If-None-Exist Extension

Official URL: http://hl7.org/fhir/us/davinci-crd/StructureDefinition/CDSHookServiceResponseExtensionIfNoneExist | Version: 2.2.1 | Highlight text changes?
Standards status: Trial-use Active as of 2026-03-26 | Maturity Level: 4 | Computable Name: CDSHookServiceResponseExtensionIfNoneExist
Other Identifiers: OID:2.16.840.1.113883.4.642.40.18.42.22

Indicates a value to assert as an if-none-exist header on a create or update action

Usages:

- This Primitive Type Profile is not used by any profiles in this Implementation Guide

You can also check for usages in the FHIR IG Statistics

### Formal Views of Profile Content

Description Differentials, Snapshots, and other representations.

- Key Elements Table
- Differential Table
- Snapshot Table
- Statistics/References
- All

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
string |  | 0..1 | string | if-none-exist header value JSON Property Name for Type: `davinci-crd.if-none-exist`
Documentation for this format

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
string |  | 0..1 | string | if-none-exist header value JSON Property Name for Type: `davinci-crd.if-none-exist`
Documentation for this format

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
string |  | 0..1 | string | if-none-exist header value JSON Property Name for Type: `davinci-crd.if-none-exist`
id |  | 0..1 | string | xml:id (or equivalent in JSON)
extension |  | 0..* | Extension | Additional content defined by implementations
value |  | 0..1 | string | Primitive value for string Max Length:1048576
Documentation for this format

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`

Summary

Maturity: 4

Key Elements View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
string |  | 0..1 | string | if-none-exist header value JSON Property Name for Type: `davinci-crd.if-none-exist`
Documentation for this format

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`

Differential View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
string |  | 0..1 | string | if-none-exist header value JSON Property Name for Type: `davinci-crd.if-none-exist`
Documentation for this format

Snapshot ViewView

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
string |  | 0..1 | string | if-none-exist header value JSON Property Name for Type: `davinci-crd.if-none-exist`
id |  | 0..1 | string | xml:id (or equivalent in JSON)
extension |  | 0..* | Extension | Additional content defined by implementations
value |  | 0..1 | string | Primitive value for string Max Length:1048576
Documentation for this format

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`

Summary

Maturity: 4

Other representations of profile: CSV, Excel, Schematron