The FHIRfly Blog
Healthcare APIs, FHIR interoperability, and building better clinical data integrations.
LOINC Code Lookup API: Search Lab Tests and Build FHIR Observations
LOINC identifies every lab test and clinical observation in healthcare. Here's how to look up codes, search by component and specimen, read the six-axis model, and drop the result into a FHIR Observation — with working TypeScript.
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NDC → RxNorm → SNOMED: Crosswalk Any Drug Code in One API Call
Stop stitching RxNav calls to NDC flat files. Here's how to crosswalk a drug code across NDC, RxNorm, and SNOMED in a single API call — with working TypeScript.
Drug Prior Auth Goes FHIR: What Developers Need to Build
CMS-0062-P extends FHIR prior auth mandates to drugs. Here's every terminology lookup your implementation needs — with working TypeScript code.
What You Can Build with a Free Healthcare Coding API
NDC, ICD-10, LOINC, SNOMED, NPI, and more — all from a single API. Here's what FHIRfly's free tier actually gives you and why healthcare data doesn't need an enterprise contract.
Why Healthcare Data APIs Are Having a Moment
Regulations, AI agents, and TEFCA are converging to make healthcare APIs essential infrastructure. Here's what's driving the shift.
ICD-10 Code Lookup API: Search Diagnoses and Procedures Programmatically
ICD-10 has 126,000+ codes across diagnoses (CM) and procedures (PCS). Here's how to look up codes, search by description, and get FHIR codings and HCC mappings — with working TypeScript examples.
NDC Lookup API: Get Drug Names, Ingredients, and Package Data in Seconds
Every healthcare app that touches medications needs NDC data. Here's how to look up drug products, search by name or ingredient, and enrich claims with structured drug info — with working TypeScript code.
Information Blocking Fines Are Real Now
ONC is issuing nonconformity letters to EHR vendors. OIG can stack $1M fines per violation. Nearly 1,600 complaints are in the queue. Here's what health IT developers need to know.
Agentic Prior Auth: Grounding the 72-Hour Clock
CMS-0057-F puts payers on a 72-hour clock for expedited prior auth. LLM agents can close the gap — but only if they're grounded against NCCI, MUE, coverage, and terminology data they can trust.
What Rural Hospitals Actually Need for Interoperability
The $50B is flowing and September's deadline looms. Rural hospitals don't need another framework — they need tools that work today.
Azure API for FHIR Retires in September — Your Options
Microsoft is shutting down Azure API for FHIR on September 30, 2026. Here's what breaks, what the migration looks like, and what your realistic options are.
Introducing @fhirfly-io/fhir-builder v1.0.0
Build valid FHIR R4 resources in TypeScript with a fluent API. Zero dependencies, 13 resource builders, build-time validation, and bundle reference resolution.
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