> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.cail.health/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.cail.health/_mcp/server.

# Overview

CAIL Health is healthcare access infrastructure for HMOs, provider networks, and health system operators. It sits between care-seeking demand and care capacity, helping organizations route members to the right available provider, understand network gaps, and monitor access performance across regions.

CAIL is not a symptom checker or a standalone healthcare app. It is an access layer for provider discovery, network availability, pathway-aware routing, jurisdiction-aware navigation, verification, demand analytics, and operational intelligence.

Healthcare resources on the wire are modeled in [FHIR R4](https://hl7.org/fhir/R4/) where appropriate. Regional differences such as provider taxonomy, emergency-care terminology, payer or HMO network rules, service availability, eligibility, and jurisdiction-specific routing semantics are resolved per jurisdiction, so the same endpoint can behave correctly across the regions CAIL supports.

## Where to start

* New here? Read the [Glossary](/glossary) for the vocabulary used across these docs.
* Want to understand a specific subject? Browse [Concepts](/concepts/fhir-r4-in-cail).
* Looking for the contract every endpoint shares? See the [Error envelope](/reference/error-envelope) and [Pagination](/reference/pagination) references.