This resource allows for the definition of some activity to be performed, independent of a particular patient, practitioner, or other performance context.

An absolute URL that is used to identify this activity definition when it is referenced in a specification, model, design or an instance. This SHALL be a URL, SHOULD be globally unique, and SHOULD be an address at which this activity definition is (or will be) published. The URL SHOULD include the major version of the activity definition. For more information see Technical and Business Versions.

Allows the activity definition to be referenced by a single globally unique identifier.

Can be a urn:uuid: or a urn:oid:, but real http: addresses are preferred.

A formal identifier that is used to identify this activity definition when it is represented in other formats, or referenced in a specification, model, design or an instance.

Allows externally provided and/or useable business identifiers to be easily associated with the module.

Typically, this is used for identifiers that can go in an HL7 v3 II data type - e.g. to identify this activity definition outside of FHIR, where the logical URL is not possible to use.

The identifier that is used to identify this version of the activity definition when it is referenced in a specification, model, design or instance. This is an arbitrary value managed by the activity definition author and is not expected to be globally unique. For example, it might be a timestamp (e.g. yyyymmdd) if a managed version is not available. There is also no expectation that versions are orderable. To provide a version consistent with the Decision Support Service specification, use the format Major.Minor.Revision (e.g. 1.0.0). For more information on versioning knowledge assets, refer to the Decision Support Service specification. Note that a version is required for non-experimental active assets.

There may be multiple different instances of a activity definition that have the same identifier but different versions.

A natural language name identifying the activity definition. This name should be usable as an identifier for the module by machine processing applications such as code generation.

Support human navigation & code generation.

The name is not expected to be globally unique. The name should be a simple alpha-numeric type name to ensure it is computable friendly.

A short, descriptive, user-friendly title for the activity definition.

The status of this activity definition. Enables tracking the life-cycle of the content.

Allows filtering of activity definition that are appropriate for use vs. not.

A flag to indicate that this activity definition is authored for testing purposes (or education/evaluation/marketing), and is not intended to be used for genuine usage.

Enables experimental content to be developed following the same life-cycle as a production-level activity definition would.

Allows filtering of activity definition that are appropriate for use vs. not.

The date (and optionally time) when the activity definition was published. The date must change when the business version changes, if it does, and it must change if the status code changes. In addition, it should change when the substantive content of the activity definition changes.

Note that this is not the same as the resource last-modified-date, since the resource may be a secondary representation of the activity definition. Additional specific dates may be added as extensions.

A free text natural language description of the activity definition from the consumer's perspective.

This description can be used to capture details such as why the activity definition was built, comments about misuse, instructions for clinical use and interpretation, literature references, examples from the paper world, etc. It is not a rendering of the module as conveyed in the text field of the resource itself. This item SHOULD be populated unless the information is available from context.

Explains why this activity definition is needed and why it has been designed as it has.

This element does not describe the usage of the activity definition (See, e.g, the comments element, or relatedArtifacts), rather it's for traceability of ''why'' the resource is either needed or ''why'' it is defined as it is. This may be used to point to source materials or specifications that drove the structure of this activity definition.

A detailed description of how the asset is used from a clinical perspective.

The date on which the asset content was approved by the publisher. Approval happens once when the content is officially approved for usage.

The date may be more recent than the approval date because of minor changes / editorial corrections.

The date on which the asset content was last reviewed. Review happens periodically after that, but doesn't change the original approval date.

If specified, this is usually after the approval date.

The period during which the activity definition content was or is planned to be effective.

The effective period for a activity definition determines when the content is applicable for usage and is independent of publication and review dates. For example, a measure intended to be used for the year 2016 would be published in 2015.

The content was developed with a focus and intent of supporting the contexts that are listed. These terms may be used to assist with indexing and searching of code system definitions.

Assist in searching for appropriate content.

When multiple usageContexts are specified, there is no expectation for whether all or any of the contexts apply.

A jurisdiction in which the activity definition is intended to be used.

Clinical topics related to the content of the asset.

Repositories must be able to determine how to categorize the asset so that it can be found by topical searches.

A contributor to the content of the asset, including authors, editors, reviewers, and endorsers.

Consumers of the content must be able to quickly determine who contributed to the content of the knowledge asset.

The name of the individual or organization that published the activity definition.

Helps establish the "authority/credibility" of the activity definition. May also allow for contact.

Usually an organization, but may be an individual. The publisher (or steward) of the activity definition is the organization or individual primarily responsible for the maintenance and upkeep of the activity definition. This is not necessarily the same individual or organization that developed and initially authored the content. The publisher is the primary point of contact for questions or issues with the activity definition. This item SHOULD be populated unless the information is available from context.

Contact details to assist a user in finding and communicating with the publisher.

May be a web site, an email address, a telephone number, etc.

A copyright statement relating to the activity definition and/or its contents. Copyright statements are generally legal restrictions on the use and publishing of the activity definition.

Consumers of the library must be able to determine any legal restrictions on the use of the activity definition and/or its content.

Related artifacts such as additional documentation, justification, or bibliographic references.

Assets must be able to provide enough information for consumers of the content (and/or interventions or results produced by the content) to be able to determine and understand the justification for and evidence in support of the content.

Each related artifact is either an attachment, or a reference to another resource, but not both.

A reference to a Library resource containing any formal logic used by the asset.

High-level categorization of the type of activity.

May determine what types of extensions are permitted.

Detailed description of the type of activity; e.g. What lab test, what procedure, what kind of encounter.

Allows matching performed to planned as well as validation against protocols.

Tends to be less relevant for activities involving particular products.

The period, timing or frequency upon which the described activity is to occur.

Allows prompting for activities and detection of missed planned activities.

Identifies the facility where the activity will occur; e.g. home, hospital, specific clinic, etc.

Helps in planning of activity.

May reference a specific clinical location or may just identify a type of location.

The type of participant in the action.

Identifies the food, drug or other product being consumed or supplied in the activity.

Identifies the quantity expected to be consumed at once (per dose, per meal, etc.).

Provides detailed dosage instructions in the same way that they are described for MedicationRequest resources.

If a dosage instruction is used, the definition should not specify timing or quantity.

Indicates the sites on the subject's body where the procedure should be performed (I.e. the target sites).

Knowing where the procedure is made is important for tracking if multiple sites are possible.

Only used if not implicit in the code found in ProcedureRequest.type.

A reference to a StructureMap resource that defines a transform that can be executed to produce the intent resource using the ActivityDefinition instance as the input.

Dynamic values that will be evaluated to produce values for elements of the resulting resource. For example, if the dosage of a medication must be computed based on the patient's weight, a dynamic value would be used to specify an expression that calculated the weight, and the path on the intent resource that would contain the result.

A brief, natural language description of the intended semantics of the dynamic value.

The path to the element to be customized. This is the path on the resource that will hold the result of the calculation defined by the expression.

The media type of the language for the expression.

An expression specifying the value of the customized element.

The expression may be inlined, or may be a reference to a named expression within a logic library referenced by the library element.