FHIR R4 MCP server — read, search, validate resources + SMART-on-FHIR auth (Epic/Cerner sandbox)
MCP MCP server exists for a simple reason — assistants are far more useful when they can act on MCP directly instead of describing what you should do. FHIR R4 MCP server — read, search, validate resources + SMART-on-FHIR auth (Epic/Cerner sandbox).
Every FHIR MCP server available today (June 2026) is a read proxy — they retrieve resources but never tell you whether the resource is valid. mcp-fhir adds HAPI profile validation as a first-class MCP tool. Composing fhir_read → validate_against_profile in one Claude session enables clinical AI pipelines that are actually safe.
You will need 2 environment variables: FHIR_BASE_URL, HAPI_VALIDATOR_URL. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.
Installation goes through your MCP client rather than a global install: point it at mcp-fhir on PyPI and it is fetched when the client starts. The copy-paste blocks for Claude Desktop, Claude Code and Cursor are further down this page.
Among the developer tooling options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes.
SyncDev reviews every entry in this directory against the project's own documentation before publishing, and revisits them as servers change.
{
"mcpServers": {
"fhir": {
"command": "uvx",
"args": ["mcp-fhir"],
"env": {
"FHIR_BASE_URL": "your-value",
"HAPI_VALIDATOR_URL": "your-value"
}
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
| Variable | Description | Required |
|---|---|---|
| FHIR_BASE_URL | Endpoint or connection string the server talks to. | Yes |
| HAPI_VALIDATOR_URL | Endpoint or connection string the server talks to. | Yes |
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