What FHIR resources can this validator check?

The validator supports Patient, Claim, Coverage, Observation, Encounter, Practitioner, Organization, Condition, MedicationRequest, DiagnosticReport, and Bundle resources.

Does this send my FHIR data to a server?

No. All validation runs entirely in your browser using JavaScript. No data is sent to any server.

What FHIR version does this support?

This validator supports FHIR R4 (4.0.1), the current stable release required for CMS interoperability rules.

Free Tool

FHIR R4 Resource Validator

Paste any FHIR R4 resource — Patient, Claim, Coverage, Observation, Encounter — and instantly validate required fields, data types, and coding systems. Runs entirely in your browser.

Load example resource:

FHIR R4 Resource JSON

Validation results will appear here

Load an example or paste your own FHIR resource

What is FHIR R4?

HL7 FHIR (Fast Healthcare Interoperability Resources) R4 is the current stable version of the FHIR standard, released in 2019 and required by CMS for interoperability compliance under the 21st Century Cures Act. FHIR R4 defines structured resource types for representing clinical, administrative, and financial healthcare data as JSON or XML.

Healthcare data engineers working with FHIR APIs, EHR integrations, or CMS interoperability rules need to validate FHIR resources to ensure required fields are present, data types are correct, and coding systems like ICD-10, LOINC, and SNOMED CT are properly referenced.

Learn more in the HL7 FHIR R4 guide or browse clinical healthcare data terms.