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API · HL7 FHIR R4

HL7 FHIR R4. NPI-keyed.

Practitioner, Organization, Location, Coverage, HealthcareService. US Core 6.1.0. SMART on FHIR auth. p99 under 300ms on single-record lookups.

Get API access →Try the FHIR sandbox →

Pilot access is operator-approved · No charge during pilot

One call. Four languages.

Every response carries provenance metadata.

 

_source names the federal dataset. _methodology pins the pipeline version. _confidence indicates the match tier.

_confidence:95%

REST API

Query with curl, JavaScript, or Python.

# Provider lookup by NPI
curl -H "Authorization: Bearer $FONTEUM_KEY" \
  "https://fonteum.com/api/v1/providers/1234567890"

# Specialty supply by state
curl -H "Authorization: Bearer $FONTEUM_KEY" \
  "https://fonteum.com/api/v1/specialties?state=CA&limit=25"

# Dataset freshness (no auth)
curl "https://fonteum.com/api/freshness"

Full spec: openapi.json · Postman collection

Interactive Docs

Explore the API.

5Source: Fonteum API SLA · Dataset: fonteum-api · Snapshot: 2026-05-27
5
Source
Fonteum API SLA
Source URL
https://fonteum.com/sla
Dataset
fonteum-api
Snapshot
2026-05-27
Fetched
2026-05-27T17:45:57.894Z
Methodology
v2026.05.0
Confidence
100%
Availability
present
License
CC-BY-4.0
Pipeline
2603964
5

FHIR resources

US Core 6.1.0 compliant

17+Source: Fonteum API SLA · Dataset: fonteum-api · Snapshot: 2026-05-27
17+
Source
Fonteum API SLA
Source URL
https://fonteum.com/sla
Dataset
fonteum-api
Snapshot
2026-05-27
Fetched
2026-05-27T17:45:57.894Z
Methodology
v2026.05.0
Confidence
100%
Availability
present
License
CC-BY-4.0
Pipeline
2603964
17+

Source families

Federal: CMS, HHS-OIG, HRSA, BLS, BEA, Census

<300msSource: Fonteum API SLA · Dataset: fonteum-api · Snapshot: 2026-05-27
<300ms
Source
Fonteum API SLA
Source URL
https://fonteum.com/sla
Dataset
fonteum-api
Snapshot
2026-05-27
Fetched
2026-05-27T17:45:57.894Z
Methodology
v2026.05.0
Confidence
100%
Availability
present
License
CC-BY-4.0
Pipeline
2603964
<300ms

p99 latency

Single-record lookups

v4Source: Fonteum API SLA · Dataset: fonteum-api · Snapshot: 2026-05-27
v4
Source
Fonteum API SLA
Source URL
https://fonteum.com/sla
Dataset
fonteum-api
Snapshot
2026-05-27
Fetched
2026-05-27T17:45:57.894Z
Methodology
v2026.05.0
Confidence
100%
Availability
present
License
CC-BY-4.0
Pipeline
2603964
v4

Provenance fields

On every response

Five FHIR resources · US Core 6.1.0

Every resource carries row-level provenance.

Practitioner

NPI-keyed individual provider records. Name, specialty, address, Medicare enrollment status.

CMS

Organization

CCN-keyed facility and group records. Linked to Care Compare quality data.

CMS

Location

Physical care delivery sites. Nursing homes, dialysis centers, home health agencies, ASCs.

CMS

Coverage

Medicare enrollment status for providers eligible to order and refer services.

CMS

HealthcareService

Service-line records for home health agencies and hospice facilities.

CMS

Authentication

Bearer token · SMART on FHIR.

Production: SMART on FHIR client credentials flow. Pilot: Bearer token issued by the operator within 1 business day.

Base URL: https://api.fonteum.com/fhir/r4

OpenAPI spec: /docs/api

Get access

Pilot access in 1 business day.

Submit a request with your use case and expected query volume. Operator-approved. No charge during the pilot period.

Request access →Download audit packSee pricing →

Compliance posture

Methodology · Corrections log · Editorial policy

fonteum

Product

  • Data
  • API
  • Methodology
  • Sources
  • Freshness
  • Citations

For buyers

  • AI agents
  • RAG developers
  • Compliance
  • Researchers
  • Developers

Reference

  • Compare
  • llms.txt
  • Agent card
  • Audit pack
  • Pilot intake
  • Research

Sourced from federal agencies. Fonteum, Inc., Delaware C-corp. © 2026.