HL7 Implementation Guide: Data Segmentation for Privacy (DS4P), Release 1 Reaffirmed
This IG entails : A CDA R2 content profile specifying constraints consistent with the DS4P requirements; and two US-specific transport profiles for NwHIN Direct and Exchange constrained based on the DS4P requirements.
See more at https://www.hl7.org/implement/standards/product_brief.cfm?product_id=354