| Left: | Extension - Tracking Number (http://hl7.org/fhir/us/mdi/StructureDefinition/Extension-tracking-number) | 
| Right: | Tracking Number (http://hl7.org/fhir/us/mdi/StructureDefinition/Extension-tracking-number) | 
| Error | StructureDefinition.version | Values for version differ: '1.1.0' vs '3.0.0-draft' | 
| Information | StructureDefinition.title | Values for title differ: 'Extension - Tracking Number' vs 'Tracking Number' | 
| Information | StructureDefinition.date | Values for date differ: '2022-08-25' vs '2025-07-24T14:39:54+00:00' | 
| Information | StructureDefinition.short | Values for short differ: 'Additional content defined by implementations' vs 'Extension' | 
| Information | StructureDefinition.definition | Values for definition differ: 'May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.' vs 'An Extension' | 
| Information | Extension.extension | Element maximum cardinalities differ: '2147483647' vs '0' | 
| Name | Value | Comments | |
|---|---|---|---|
 abstract | false | ||
 baseDefinition | http://hl7.org/fhir/StructureDefinition/Extension | ||
 copyright | |||
 date | 2022-08-25 | 2025-07-24T14:39:54+00:00 | 
  | 
 description | This Extension contains a tracking number, such as a case number or file number assigned by an MDI organization, EDRS, or other involved organization to facilitate recognition of common case records across disparate systems and over time. | Tracking number, such as a case number or file number assigned by an MDI CMS or EDRS, and can represent other tracking numbers, if required. | 
  | 
 experimental | |||
 fhirVersion | 4.0.1 | ||
 jurisdiction | |||
![]()  jurisdiction[0] | urn:iso:std:iso:3166#US | ||
 kind | complex-type | ||
 name | ExtensionTrackingNumber | ||
 publisher | HL7 International / Public Health | ||
 purpose | |||
 status | active | ||
 title | Extension - Tracking Number | Tracking Number | 
  | 
 type | Extension | ||
 url | http://hl7.org/fhir/us/mdi/StructureDefinition/Extension-tracking-number | ||
 version | 1.1.0 | 3.0.0-draft | 
  | 
| Name | L Flags | L Card. | L Type | L Description & Constraints | R Flags | R Card. | R Type | R Description & Constraints | Comments![]()  | 
|---|---|---|---|---|---|---|---|---|---|
![]()  | 0..* | Extension | Tracking Numbers Extension | 0..* | Extension | Tracking Numbers Extension | |||
![]() ![]()  | 0..1 | string | Unique id for inter-element referencing | 0..1 | string | Unique id for inter-element referencing | |||
![]() ![]()  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url  | 0..0 | 
  | ||||
![]() ![]()  | S | 1..1 | uri | "http://hl7.org/fhir/us/mdi/StructureDefinition/Extension-tracking-number" | S | 1..1 | uri | "http://hl7.org/fhir/us/mdi/StructureDefinition/Extension-tracking-number" | |
![]() ![]()  | S | 0..1 | Identifier | Value of extension | S | 0..1 | Identifier | Value of extension | |
![]() ![]() ![]()  | 0..1 | string | Unique id for inter-element referencing | 0..1 | string | Unique id for inter-element referencing | |||
![]() ![]() ![]()  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url  | |||
![]() ![]() ![]()  | ?!Σ | 0..1 | code | usual | official | temp | secondary | old (If known) Binding: ?? (required): Identifies the purpose for this identifier, if known .  | ?!Σ | 0..1 | code | usual | official | temp | secondary | old (If known) Binding: ?? (required): Identifies the purpose for this identifier, if known .  | |
![]() ![]() ![]()  | SΣ | 0..1 | CodeableConcept | Tracking Number Type (extensible value set) Binding: ?? (extensible)  | SΣ | 0..1 | CodeableConcept | Tracking Number Type (extensible value set) Binding: ?? (extensible)  | |
![]() ![]() ![]()  | SΣ | 0..1 | uri | The namespace for the identifier value Example General: http://www.acme.com/identifiers/patient  | SΣ | 0..1 | uri | The namespace for the identifier value Example General: http://www.acme.com/identifiers/patient  | |
![]() ![]() ![]()  | SΣ | 0..1 | string | The value that is unique Example General: 123456  | SΣ | 0..1 | string | The value that is unique Example General: 123456  | |
![]() ![]() ![]()  | Σ | 0..1 | Period | Time period when id is/was valid for use | Σ | 0..1 | Period | Time period when id is/was valid for use | |
![]() ![]() ![]()  | Σ | 0..1 | Reference(Organization) | Organization that issued id (may be just text) | Σ | 0..1 | Reference(Organization) | Organization that issued id (may be just text) | |
  Documentation for this format | |||||||||