Clinical Document Architecture - Local Development build (v2.0.1-sd-202510-matchbox-patch) built by the FHIR (HL7® FHIR® Standard) Build Tools. See the Directory of published versions
| Official URL: http://hl7.org/cda/stds/core/StructureDefinition/II | Version: 2.0.1-sd-202510-matchbox-patch | |||
| Active as of 2025-10-29 | Computable Name: II | |||
An identifier that uniquely identifies a thing or object. Examples are object identifier for HL7 RIM objects, medical record number, order id, service catalog item id, Vehicle Identification Number (VIN), etc. Instance identifiers are defined based on ISO object identifiers.
Usages:
You can also check for usages in the FHIR IG Statistics
Description of Template, Differentials, Snapshots and how the different presentations work.
This structure is derived from ANY
| Name | Flags | Card. | Type | Description & Constraints    Filter:  ![]() ![]()  | 
|---|---|---|---|---|
![]()  | 
C | 1..* | ANY | XML Namespace: urn:hl7-org:v3 Base for all types and resources Elements defined in Ancestors:@nullFlavor Logical Container: ClinicalDocument (CDA Class) Constraints: II-1  | 
![]() ![]()  | 
0..1 | st | ||
![]() ![]()  | 
0..1 | bl | ||
![]() ![]()  | 
0..1 | oid, uuid, ruid | ||
![]() ![]()  | 
0..1 | st | ||
  Documentation for this format | ||||
| Id | Grade | Path(s) | Description | Expression | 
| II-1 | error | II | An II instance must have either a root or an nullFlavor. | 
      root.exists() or nullFlavor.exists()
     | 
  
| Name | Flags | Card. | Type | Description & Constraints    Filter:  ![]() ![]()  | 
|---|---|---|---|---|
![]()  | 
C | 1..* | ANY | XML Namespace: urn:hl7-org:v3 Base for all types and resources Elements defined in Ancestors:@nullFlavor Logical Container: ClinicalDocument (CDA Class) Constraints: II-1  | 
![]() ![]()  | 
0..1 | cs | Binding: CDANullFlavor (required) | |
![]() ![]()  | 
0..1 | st | ||
![]() ![]()  | 
0..1 | bl | ||
![]() ![]()  | 
0..1 | oid, uuid, ruid | ||
![]() ![]()  | 
0..1 | st | ||
  Documentation for this format | ||||
| Path | Status | Usage | ValueSet | Version | Source | 
| II.nullFlavor | Base | required | CDANullFlavor | 📦2.0.1-sd-202510-matchbox-patch | This IG | 
| Id | Grade | Path(s) | Description | Expression | 
| II-1 | error | II | An II instance must have either a root or an nullFlavor. | 
      root.exists() or nullFlavor.exists()
     | 
  
| Name | Flags | Card. | Type | Description & Constraints    Filter:  ![]() ![]()  | 
|---|---|---|---|---|
![]()  | 
C | 1..* | ANY | XML Namespace: urn:hl7-org:v3 Base for all types and resources Elements defined in Ancestors:@nullFlavor Logical Container: ClinicalDocument (CDA Class) Constraints: II-1  | 
![]() ![]()  | 
0..1 | cs | Binding: CDANullFlavor (required) | |
![]() ![]()  | 
0..1 | st | ||
![]() ![]()  | 
0..1 | bl | ||
![]() ![]()  | 
0..1 | oid, uuid, ruid | ||
![]() ![]()  | 
0..1 | st | ||
  Documentation for this format | ||||
| Path | Status | Usage | ValueSet | Version | Source | 
| II.nullFlavor | Base | required | CDANullFlavor | 📦2.0.1-sd-202510-matchbox-patch | This IG | 
| Id | Grade | Path(s) | Description | Expression | 
| II-1 | error | II | An II instance must have either a root or an nullFlavor. | 
      root.exists() or nullFlavor.exists()
     | 
  
This structure is derived from ANY
Summary
Structures
This structure refers to these other structures:
Extensions
This structure refers to these extensions:
Differential View
This structure is derived from ANY
| Name | Flags | Card. | Type | Description & Constraints    Filter:  ![]() ![]()  | 
|---|---|---|---|---|
![]()  | 
C | 1..* | ANY | XML Namespace: urn:hl7-org:v3 Base for all types and resources Elements defined in Ancestors:@nullFlavor Logical Container: ClinicalDocument (CDA Class) Constraints: II-1  | 
![]() ![]()  | 
0..1 | st | ||
![]() ![]()  | 
0..1 | bl | ||
![]() ![]()  | 
0..1 | oid, uuid, ruid | ||
![]() ![]()  | 
0..1 | st | ||
  Documentation for this format | ||||
| Id | Grade | Path(s) | Description | Expression | 
| II-1 | error | II | An II instance must have either a root or an nullFlavor. | 
      root.exists() or nullFlavor.exists()
     | 
  
Key Elements View
| Name | Flags | Card. | Type | Description & Constraints    Filter:  ![]() ![]()  | 
|---|---|---|---|---|
![]()  | 
C | 1..* | ANY | XML Namespace: urn:hl7-org:v3 Base for all types and resources Elements defined in Ancestors:@nullFlavor Logical Container: ClinicalDocument (CDA Class) Constraints: II-1  | 
![]() ![]()  | 
0..1 | cs | Binding: CDANullFlavor (required) | |
![]() ![]()  | 
0..1 | st | ||
![]() ![]()  | 
0..1 | bl | ||
![]() ![]()  | 
0..1 | oid, uuid, ruid | ||
![]() ![]()  | 
0..1 | st | ||
  Documentation for this format | ||||
| Path | Status | Usage | ValueSet | Version | Source | 
| II.nullFlavor | Base | required | CDANullFlavor | 📦2.0.1-sd-202510-matchbox-patch | This IG | 
| Id | Grade | Path(s) | Description | Expression | 
| II-1 | error | II | An II instance must have either a root or an nullFlavor. | 
      root.exists() or nullFlavor.exists()
     | 
  
Snapshot View
| Name | Flags | Card. | Type | Description & Constraints    Filter:  ![]() ![]()  | 
|---|---|---|---|---|
![]()  | 
C | 1..* | ANY | XML Namespace: urn:hl7-org:v3 Base for all types and resources Elements defined in Ancestors:@nullFlavor Logical Container: ClinicalDocument (CDA Class) Constraints: II-1  | 
![]() ![]()  | 
0..1 | cs | Binding: CDANullFlavor (required) | |
![]() ![]()  | 
0..1 | st | ||
![]() ![]()  | 
0..1 | bl | ||
![]() ![]()  | 
0..1 | oid, uuid, ruid | ||
![]() ![]()  | 
0..1 | st | ||
  Documentation for this format | ||||
| Path | Status | Usage | ValueSet | Version | Source | 
| II.nullFlavor | Base | required | CDANullFlavor | 📦2.0.1-sd-202510-matchbox-patch | This IG | 
| Id | Grade | Path(s) | Description | Expression | 
| II-1 | error | II | An II instance must have either a root or an nullFlavor. | 
      root.exists() or nullFlavor.exists()
     | 
  
This structure is derived from ANY
Summary
Structures
This structure refers to these other structures:
Extensions
This structure refers to these extensions: