In the US Realm service claim locations are typically coded using the CMS Place of Service Code Set. We should expand ValueSet HealthcareServiceLocation to also include all concept codes in that CMS code system. The registered external code system OID is 2.16.840.1.113883.13.180.

For context please see the HL7 Implementation Guide for CDA® R2: Plan-to-Plan Personal Health Record (PHR) Data Transfer, Release 1 pages 66 - 78, 86, and 124 - 125. We should make C-CDA 2.1 consistent with how service locations are coded in that other IG.