Implementation Guide
ePA Medication Service
Version 1.0.5-1 - release

## Extension: RxPrescriptionProcessIdentifierExtension - Detailed Descriptions

Active as of 2025-02-28

Definitions for the rx-prescription-process-identifier-extension extension.

- Key Elements Table
- Differential Elements Table
- Snapshot Elements Table

Guidance on how to interpret the contents of this table can be found here

0. Extension
Definition | This extension is used to track medication prescription transactions between the E-Rezept-Fachdienst and the ePA. The RxPrescriptionProcessIdentifier is generated by the ePA Medication Service and consists of the PrescriptionId and the authoredOn date of the operation parameters request. It ensures consistent referencing and management of medication-related resources across different systems. Optional Extension Element - found in all resources.
Short | ExtensionOptional Extensions Element
Control | 0..* This element is affected by the following invariants: ele-1
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
2. Extension.extension
Definition | An Extension 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.
Short | ExtensionAdditional content defined by implementations
Comments | There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control | 0..0* This element is affected by the following invariants: ele-1
Type | Extension
Alternate Names | extensions, user content
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
Slicing | This element introduces a set of slices on `Extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
4. Extension.url
Definition | Source of the definition for the extension code - a logical name or a URL.
Short | identifies the meaning of the extension
Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control | 1..1
Type | uri
XML Format | In the XML format, this property is represented as an attribute.
Fixed Value | `https://gematik.de/fhir/epa-medication/StructureDefinition/rx-prescription-process-identifier-extension`
6. Extension.value[x]
Definition | Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short | Value of extension
Control | 0..1 This element is affected by the following invariants: ele-1
Type | Identifier(RxPrescriptionProcessIdentifier), date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))

Guidance on how to interpret the contents of this table can be found here

0. Extension
Definition | This extension is used to track medication prescription transactions between the E-Rezept-Fachdienst and the ePA. The RxPrescriptionProcessIdentifier is generated by the ePA Medication Service and consists of the PrescriptionId and the authoredOn date of the operation parameters request. It ensures consistent referencing and management of medication-related resources across different systems.
2. Extension.extension
Control | 0..0
4. Extension.url
Fixed Value | `https://gematik.de/fhir/epa-medication/StructureDefinition/rx-prescription-process-identifier-extension`
6. Extension.value[x]
Type | Identifier(RxPrescriptionProcessIdentifier), date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]

Guidance on how to interpret the contents of this table can be found here

0. Extension
Definition | This extension is used to track medication prescription transactions between the E-Rezept-Fachdienst and the ePA. The RxPrescriptionProcessIdentifier is generated by the ePA Medication Service and consists of the PrescriptionId and the authoredOn date of the operation parameters request. It ensures consistent referencing and management of medication-related resources across different systems.
Short | Extension
Control | 0..* This element is affected by the following invariants: ele-1
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
2. Extension.id
Definition | Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short | Unique id for inter-element referencing
Control | 0..1
Type | string
XML Format | In the XML format, this property is represented as an attribute.
4. Extension.extension
Definition | An Extension
Short | Extension
Control | 0..0 This element is affected by the following invariants: ele-1
Type | Extension
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing | This element introduces a set of slices on `Extension.extension`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
6. Extension.url
Definition | Source of the definition for the extension code - a logical name or a URL.
Short | identifies the meaning of the extension
Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control | 1..1
Type | uri
XML Format | In the XML format, this property is represented as an attribute.
Fixed Value | `https://gematik.de/fhir/epa-medication/StructureDefinition/rx-prescription-process-identifier-extension`
8. Extension.value[x]
Definition | Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short | Value of extension
Control | 0..1 This element is affected by the following invariants: ele-1
Type | Identifier(RxPrescriptionProcessIdentifier)
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)