Public surface / Payer Provider Directory APIs

UnitedHealthcare Provider Directory API

This endpoint answers publicly but declares little about itself.

Current grade C

Reachability100

Capability transparency100

Interop readiness0

Observed surface

Base URL: https://flex.optum.com/fhirpublic/R4
Category: Payer Provider Directory APIs
Availability: answered 2 of 2 checks so far; availability is reported once 14 observations exist
Vantage agreement: reachable from all 3 vantages, which are 3 hosts on one network (github-actions): one network's view sampled 3 times, not 3 independent networks

Interpretation

A grade describes two public discovery documents at one point in time. It does not inspect patient data, authenticated behavior, or clinical quality.

Read the scoring method →

Findings

Reachability100

Pass: /metadata answers with HTTP 2xx over HTTPS: reachable from all 3 vantages, which are 3 hosts on one network (github-actions): one network's view sampled 3 times, not 3 independent networksR1 Spec ↗
Pass: /metadata responded in 995 ms (median across 3 reachable vantages on one network)R2 Spec ↗

Capability transparency100

Pass: fhirVersion declared: '4.0.1' (expected 4.x)T1 Spec ↗
Pass: software name and version declaredT2 Spec ↗
Pass: 9 resource types declaredT3 Spec ↗
Pass: 9/9 declared resources document their interactionsT4 Spec ↗

Interop readiness0

Needs attention: 9 profile canonical(s) declared in rest.resource.profile, none of them US Core, CARIN, or Da Vinci; also checked rest.resource.supportedProfile, instantiates, imports, meta.profileI1 Spec ↗
Note: SMART discovery not applicable: a Provider Directory API is public by designI2 Spec ↗
Note: OAuth security not applicable: a Provider Directory API is public by designI3 Spec ↗

Observed since 2026-08-19; no changes to declared capability recorded.

Registry provenance

How this entry was verified

live CapabilityStatement fetch (fhirVersion 4.0.1, 9 resource types); implementation.url matches the requested base exactly. The document names the platform operator, not the brand: publisher 'Optum', software 'optum-flex-server-default' 4.4.2.4. Attribution to UnitedHealthcare rests on UnitedHealthcare publishing this server's capability-statement URL on its own site, under the heading 'Authorization NOT Required Endpoints', at https://www.uhc.com/legal/interoperability-apis/patient-access-api. The two strings that page labels 'Base request URL' answer 403 (https://flex.optum.com/fhirpublic) and 502 (https://flex.optum.com/fhirpublic2025); the metadata URL printed beside them is the one that works, and this entry is its base (recorded 2026-08-19). No later re-check is recorded, so the date above is the last time anyone checked this entry against the live endpoint.

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This is an observational snapshot of a public, unauthenticated surface. It is not an audit, a ranking of care quality, or a statement about anyone's regulatory compliance. See how we grade.