HRM Accompanying Mnemonic Extension

Canonical	../StructureDefinition/hrm-accompanying-mnemonic
Status	draft · 1.26.0
Base	Extension (constraint)
Context	Observation (element)
Source	FSH · JSON

The accompanying mnemonic of an observation within a report ingested from Health Report Manager, preserved exactly as the source message carried it.

Overview

This is the one of the three with nowhere else to go. The mnemonic reaches code.text only in the narrow case where the message carried no accompanying description; otherwise this extension is the only place it survives the conversion.

Present only when the source field was populated, and copied without normalisation, trimming or validation. It is a source-local abbreviation, not a code from any published terminology: do not match it against one.

Nexus EMR writes this today at http://services.well.com/fhir/observation/hrm-accompanying-mnemonic (FHIR-372): it is live in stored Observation.extension entries and in code, and is under migration to the canonical declared here. Write the canonical; expect both until the migration completes.