Composition EHR Share Extension

Canonical	../StructureDefinition/composition-ehr-share
Status	draft · 1.26.0
Base	Extension (constraint)
Context	Composition (element)
Source	FSH · JSON

One completed share of this signed note to an EHR outside the practice. Repeats: a note shared three times carries three.

Overview

Completed shares only. A share still in flight is not recorded. This element is read back to patients as a disclosure record, and listing a pending share would tell a patient their record went somewhere it has not yet gone.

The destination is a string, not Reference(Organization). It is routinely an external system with no Organization in this practice's directory, and a reference that cannot resolve is worse than a name that can be read.

FIRST PASS. This extension is declared from its production shape rather than from a modelling pass. See the file comment for the canonical it publishes under and why that is not the URL the software writes today.

MIGRATION. Nexus EMR writes this extension today at http://services.well.com/fhir/StructureDefinition/composition-ehr-share. That address is live in stored notes and in code, and is under migration to the canonical declared here (FHIR-370). Write the canonical; when reading, match on the URL suffix composition-ehr-share so that notes filed under either address are seen.