Implement USCDI v4 data class requirements by mapping required data elements to their corresponding US Core profiles and ensuring complete MustSupport field population when writing FHIR resources

Verified steps

1. Review the USCDI v4 data class and data element list and map each data element to the corresponding US Core profile (e.g., USCDI Average Blood Pressure maps to US Core Average Blood Pressure Profile)
2. For each FHIR resource being written, populate all MustSupport elements defined in the applicable US Core profile — systems claiming US Core conformance must be able to populate these fields if the data exists
3. Validate resources against the current US Core profiles using the FHIR $validate operation or a validation library, checking that all required bindings use codes from the correct value sets
4. Handle new USCDI v4 data classes such as Health Insurance Information by implementing the US Core Coverage profile with the required payer, beneficiary, and period elements populated
5. Document which USCDI data elements your system supports and which are not applicable for your use case, as the ONC certification criteria require attestation of supported data classes