The FHIRfly Blog
Healthcare APIs, FHIR interoperability, and building better clinical data integrations.
CVX Code Lookup API: Vaccine Codes to FHIR Immunizations
CVX is the vocabulary every immunization record speaks. Here's how to look up and search vaccine codes, crosswalk them to NDC, and build a FHIR Immunization — with working TypeScript.
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MCP vs REST: What Two Real Integrations Taught Us
Two developers integrated our clinical coding API in the same week. One shipped, one gave up in three hours. The difference was not the data — it was discoverability.
Our Most Expensive Search Index Served Zero Queries
A database CPU alert sent us hunting for a traffic spike. What we found instead was an autocomplete index over 9.6M providers that nothing ever queried.
Add the FHIRfly MCP Server to Claude, Cursor & Windsurf
Step-by-step setup for the FHIRfly MCP server in Claude Desktop, Claude Code, Cursor, Windsurf, and VS Code — with config, verification, and troubleshooting.
The Healthcare Data API for AI Agents: NPI, Drugs, Codes as Tools
How to give an AI agent grounded access to healthcare reference data — providers (NPI), drugs (NDC, RxNorm), diagnoses (ICD-10, SNOMED), labs (LOINC), and more — via an MCP server or a REST API, with copy-paste examples.
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.
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.
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