SMART Base
1.0.0 - release

This page is part of the SMART Base (v1.0.0: Release) based on FHIR (HL7® FHIR® Standard) R4. This is the current published version in its permanent home (it will always be available at this URL). For a full list of available versions, see the Directory of published versions

ActorDefinition: Client Registry / Master Patient Index (Experimental)

Official URL: http://smart.who.int/base/ActorDefinition/DAK.Persona.System.ClientRegistry Version: 1.0.0
Draft as of 2026-08-27 Computable Name: ClientRegistry

A digital system that creates, maintains, and provides authoritative unique identifiers for individuals (persons) accessing health services, enabling cross-facility patient matching and de-duplication.

The client registry supports DHIs including:

  • Verify a person's unique identity (2.1.1)
  • Enrol person(s) for health services/clinical care plan (2.1.2)
  • Merge, de-duplicate and curate coded datasets (4.2.2)
  • Standards-compliant interoperability to link records across systems (4.4.2)

Services and Application Types:

  • C6 — Identification registries and directories
  • C8 — Master patient index

Actor: ClientRegistry Client Registry / Master Patient IndexType: system

https://www.who.int/publications/i/item/9789240081949