> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://help.truemed.com/letters-of-medical-necessity-lm-ns/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://help.truemed.com/_mcp/server.

# Letters of Medical Necessity (LMNs)

## Docs

- [What is a Letter of Medical Necessity?](https://help.truemed.com/letters-of-medical-necessity-lm-ns/lmn-basics/what-is-an-lmn.md): Learn what a Letter of Medical Necessity is, why it's required for HSA/FSA purchases, how long it's valid, and how it works across merchants and subscriptions.
- [LMN Requirements](https://help.truemed.com/letters-of-medical-necessity-lm-ns/lmn-basics/lmn-requirements.md): What a valid Letter of Medical Necessity must contain, how Truemed's clinical process meets those standards, and what to check if your LMN is questioned by your HSA/FSA administrator.
- [LMN Status & Troubleshooting](https://help.truemed.com/letters-of-medical-necessity-lm-ns/lmn-status-troubleshooting.md): Learn how to check your LMN status, what to do if you didn't receive a confirmation email, how to troubleshoot a missing or rejected LMN, and when to reach out to support.
- [Updating Your LMN](https://help.truemed.com/letters-of-medical-necessity-lm-ns/updating-your-lmn.md): Learn how to correct or update your Letter of Medical Necessity, including diagnosis changes, merchant corrections, personal detail updates, and renewals.
- [LMN Requests](https://help.truemed.com/letters-of-medical-necessity-lm-ns/lmn-requests.md): How to request a Letter of Medical Necessity for new purchases, past purchases, non-partner merchants, dependents, and new products.
- [Gym & Fitness Studio Membership LMN](https://help.truemed.com/letters-of-medical-necessity-lm-ns/gym-fitness-studio-membership-lmn.md): How to use your HSA/FSA funds for a gym or fitness studio membership by getting an LMN through Truemed.