Verify Code Existence

This transaction allows a PoS, or any OHIE component, to access terminological information in the terminology service to verify that a code exists. A typical example would be to validate that the codes contained in an incoming patient data message are, in fact, from a required code system, e.g. ICD-10 or LOINC.

Both external systems and systems inside the HIE may perform this transaction directly with the TS. The sequence diagram below shows the steps that occur for a system using this transaction.

1. Existence: Is a Concept Code present in a specified Code System. E,g., is '123XYZ' a valid Code in the ICD-10 Code System?

Workflow Maturity	Mature	One or more OpenHIE implementations of this workflow exist in one or more countries Workflow is defined and ARB approved Workflow is supported by mature standards
Standards*		The FHIR CodeSystem validate-code operation: http://build.fhir.org/codesystem-operation-validate-code.html. HL7 FHIR Specifications v3.0 or higher support validate-code. The response is a Boolean (true or false) based on whether the code exists in the specified CodeSystem. This workflow implements the IHE IT Infrastructure Technical Framework Supplement - Sharing Valuesets, Codes, and Maps (SVCM) Transaction: Validate Code ITI-Y5 for Code Systems.
Assumptions and Prerequisites		The required CodeSystems have been preloaded into the Terminology Service.
Actors		PoS - The point-of-service system or other HIE component that is requesting to verify a code. TS - Stores the curated official version of the terminology and codes for the health system.

Interaction Description

The following is a description of the interaction steps.

Ref	Interaction	Data	Transaction Options
1	Code verification request	The validate-code request is triggered by a PoS or other HIE component. Input: A Concept Code and target Code System.	FHIR CodeSystem Resource, $validate-code operation
2	Code verification response	The response is sent back to the requesting system. Output: a True or False response.	FHIR CodeSystem Resource, $validate-code operation