haau3 FHIR Implementation Guide (HFIG)
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OperationDefinition: Counties of a state

Official URL: https://haau3.com/fhir/OperationDefinition/InsurancePlan-counties Version: 1.0.0
Active as of 2026-10-14 Computable Name: InsurancePlanCounties

Lists the counties and county equivalents of a US state, the District of Columbia or a territory, sorted by name, each with its five-digit FIPS state and county code: the code the coverage-area-county search takes. The list is the U.S. Census Bureau's 2020 FIPS codes for counties and county equivalents. It answers whether or not a plan is sold in a county.

URL: [base]/InsurancePlan/$counties

Parameters

UseNameScopeCardinalityTypeBindingDocumentation
INstate1..1string

The two-letter USPS code of a state, the District of Columbia or a territory, in either case: FL.

OUTcounty0..*

One county, by name order.

OUTcounty.code1..1Coding

The county's five-digit FIPS state and county code in the system http://terminology.hl7.org/CodeSystem/FIPS64, with the county's name as the Census Bureau writes it (Miami-Dade County) as its display.

OUTcounty.state1..1string

The two-letter USPS code of the county's state, district or territory.

OUTsource1..1string

Where the list comes from: the Census Bureau's 2020 county codes and the address it is published at.

GET [base]/InsurancePlan/$counties?state=FL. A state code that is not two letters is refused with 400; one that names no state, district or territory answers 404. The response is a Parameters resource: one county parameter per county, then the source.