This project will establish definitive HL7 mapping guidance for C-CDA to FHIR and FHIR to C-CDA using the document types in C-CDA R2.1 plus C-CDA Companion Guide R2 referenced/implied in the 2015 Certification Edition Cures Update and USCDI v1 Clinical Notes data class: CCD, Discharge Summary, Referral Note, Consultation Note, Procedure Note, History and Physical, and Progress Note document types. The project will: 1. Produce FHIR resources/US Core profiles to C-CDA section templates and C-CDA section templates to FHIR resource/US Core profiles mappings, including relevant entries and provenance, for (using C-CDA Section Names): Patients, Encounters, Problems, Allergies/Intolerances, Vital Signs, Results, Medications Administered, Social History, Procedures, Immunizations, History of Present Illness, Medications, Plan of Treatment, Reason for Visit, and other sections of interest and agreed to. using as a starting point the initial mappings established in the C-CDA on FHIR R1 implementation guide, as well as community developed mappings. 2. Propose additional FHIR attributes, extensions and/or FHIR Core additions through the respective FHIR resource stewards as identified and appropriate 3. Propose additional CDA extensions through SDWG as appropriate 4. Collaborate with the then current annual value set harmonization process (currently PSS 1696) when alignment of code system/value sets are identified. 5. Establish a publication format, informed by the v2-to-FHIR and other mapping efforts, to ballot and publish the proposed definitive mappings, that also enables FHIR standard/IGs and C-CDA IG to reference applicable mappings in context. Not in scope: 1. Incorporation of new FHIR extensions and/or profiles within the US Core Implementation Guide. The US Core project may consider any FHIR extensions and/or attribute updates for inclusion. 2. Additional document types of interest, although they may be added through a PSS update when agreed to. 3. A logical model as that is covered in the CDA IG Web Publishing project ( PSS-1684 ) 4. Inclusion of references to the C-CDA - FHIR mappings in the respective C-CDA and FHIR documentation that replaces or adds to existing mapping tables (e.g., replacing the mapping tab in the C-CDA to FHIR IG).  This will be managed by the respective projects maintaining that documentation. Steps: Step 1 – Create an initial map for 1-2 sections/entries to develop the process and format, etc. Step 2 – Complete the mapping for the scope defined above.