United States (us)
Locale code
Section titled “Locale code”us
Patient identifiers
Section titled “Patient identifiers”Social Security Number (SSN)
Section titled “Social Security Number (SSN)”- System:
http://hl7.org/fhir/sid/us-ssn - Format:
NNN-NN-NNNN(AAA-GG-SSSS) - Generation rules: Area codes are drawn from the 900–999 range, which the Social Security Administration has never assigned to real people. The IRS reserved range 987-65-43XX is excluded. Group and serial numbers are randomised within valid ranges (non-zero).
- Algorithm: Format and range validation only (no check digit).
Medical Record Number (MRN)
Section titled “Medical Record Number (MRN)”- System:
http://hospital.example.org/fhir/mrn - Format: Two uppercase letters followed by six digits (e.g.
AB123456) - Algorithm: Format validation only.
Note: This MRN system URI is a placeholder. Real deployments use facility-specific NamingSystem URIs.
Practitioner identifiers
Section titled “Practitioner identifiers”National Provider Identifier (NPI)
Section titled “National Provider Identifier (NPI)”- System:
http://hl7.org/fhir/sid/us-npi - Format: 10 digits
- Algorithm: Luhn — the NPI check digit is computed against the string
80840prepended to the nine-digit base, per the CMS NPI standard.
Organisation identifiers
Section titled “Organisation identifiers”NPIs are also used for organisations, using the same system URI and algorithm.
Address format
Section titled “Address format”Standard US format: street number + street name, city, state abbreviation, five-digit ZIP code. Country code US.
Name pool
Section titled “Name pool”Common US given and family names.