The Composition resource is a set of healthcare-related information that is assembled together into a single logical document that provides a single coherent statement of meaning, establishes its own context and that has clinical attestation with regard to who is making the statement.
FHIR Resource: Composition https://www.hl7.org/fhir/r4/composition.html
Composition resource is used to describe Clinical Note document in scope of C-CDA on FHIR implementation.
Supported C-CDA on FHIR profile required to be set.
https://api.healthgorilla.com/fhir/R4/Composition