Existing Wording
This resource is used to record the details of procedures performed on a patient. A procedure is an activity that is performed with or on a patient as part of the provision of care. Examples include surgical procedures, diagnostic procedures, endoscopic procedures, biopsies, and exclude things for which there are specific resources, such as immunizations, drug administrations.

Proposed Wording
This resource is used to record the details of procedures performed on a patient. A procedure is an activity that is performed with or on a patient as part of the provision of care. Examples include surgical procedures, endoscopic procedures, biopsies, and exclude things for which there are specific resources, such as immunizations, drug administrations, and diagnostic procedures [provided FHIR adds a DiagnosticProcedure resource].

Comments
Procedure and ProcedureRequest form a pair. Should such a pair also exist for Diagnostic procedures as we have a DiagnosticOrder resource. Currently the text for procedure states that a procedure could be diagnostic procedure. Yet, for the -Request/Order resources, we make the distinction.

Disposition WG
Orders & Observations

Grahame's Comments
I think that this is consistent, but PC could make things easier by calling it "a procedure perfomed for diagnostic reasons". Still, the grey zone is difficult in real life; in some cases, the procedure is implied (e.g. phlebotomy) and in other cases, the diagnostic service is implied (e.g. in research labs). Usually, the diagnostic order is explicit for billing purposes. Given that this is a real world ambiguity, I'm not sure how much we can do about it