Retired: instance-scoped identifier systems

This page described a migration between two forms of instance-scoped identifier system:

https://fhir.apps.health/[instance-id]/NamingSystem/[resource]-identifier
https://fhir.apps.health/NamingSystem/[instance-id]-[resource]-identifier

Both forms are retired. Neither is required, neither is validated, and Nexus EMR no longer mints either one. If you adopted either, nothing breaks: identifiers already written remain valid FHIR, because no profile constrains identifier.system in the first place. There is no migration to perform and no deadline to meet.

What to do instead

Carry the identifier the source system assigns, under a system URI that genuinely identifies it. Where a governed system exists (a provincial health number, a regulator's licence number, LOINC), use that. See Nexus EMR Identifiers and References.

Where a local code has no recognized system at all, the profiles define a raw-code fallback template. That is a separate mechanism and it is current: see Raw codes from source systems.

Why this page still exists

The URL was published, so it resolves rather than 404s. It carries no current guidance.