A denied therapy claim isn’t the final word. You have a legal right to appeal it, and a real chance of winning. US law gives you two formal steps: an internal appeal with your own insurer, and, if that fails, an external review by an independent reviewer who does not work for your insurance company at all.
Here is exactly how the process works and how to give yourself the best odds.
Why Therapy Claims Get Denied
Understanding the reason behind a denial shapes how you appeal it. Common reasons include:
- “Not medically necessary” — the most common reason cited, especially for ongoing or intensive treatment
- Out-of-network provider — your plan does not cover (or barely covers) the specific therapist you saw
- Missing prior authorization — the service needed pre-approval that was not obtained before treatment
- Coding or billing errors — a mismatched diagnosis code, procedure code, or clerical mistake on the claim itself
- Session or benefit limits reached — you have used up a capped number of covered visits for the year
- Plan exclusion — the specific service (like couples counseling) is not covered under your plan at all
Your denial letter is required to state the specific reason. If it does not clearly explain why, that is your first call to make and ask your insurer to clarify in writing before you do anything else.
Step 1: File an Internal Appeal
This is your first formal challenge, made directly to your insurance company.
- Request the denial reason in writing, if you do not already have it. Insurers are required to explain why a claim was denied and how to dispute it.
- Gather supporting documentation. Ask your therapist for a letter explaining medical necessity. Such as, why this treatment, at this frequency, is clinically appropriate for your diagnosis.
- Submit a written appeal following your plan’s specific process, found in your denial letter or plan documents. Include your policy number, claim number, the service in question, and your supporting documentation.
- Track your deadline. Under federal rules, you generally have up to 180 days from the date of the denial notice to file an internal appeal but check your specific plan documents, since some state rules differ.
- Ask for expedited review if it is urgent. If delaying treatment would seriously harm your health, your insurer must speed up the appeal process rather than making you wait for the standard timeline.
What to Include in Your Appeal Letter
A strong appeal letter is specific, not just emotional. Include:
- Your name, policy number, and the claim or reference number
- The exact service and dates being appealed
- A clear statement of why the treatment is medically necessary and it is ideally backed by your therapist’s clinical notes
- Any relevant diagnosis (e.g., generalized anxiety disorder, major depressive disorder) tied to a recognized diagnostic code
- A request for a specific outcome: “I am requesting that this claim be reprocessed and paid in full.”
If You Think It’s a Parity Violation
If your denial seems to treat mental health care more restrictively than physical health care under the same plan like stricter visit limits, higher copays, or tougher prior authorization requirements than for comparable medical care. This may violate the Mental Health Parity and Addiction Equity Act. You can:
- Ask your insurer directly to explain how the mental health limitation compares to an equivalent medical/surgical limitation (they are required to be able to answer this)
- File a complaint with your state’s Department of Insurance
File a complaint with the US Department of Labor if your plan is employer-sponsored (ERISA-governed).
A Realistic Timeline
| Step | Typical Deadline |
| File internal appeal | Up to 180 days from denial notice |
| Insurer responds to internal appeal | Weeks, faster if urgent |
| Request external review (if denied again) | Roughly 120 days from final internal denial |
| External reviewer’s decision | Binding — insurer must comply |
Exact numbers vary slightly by state and plan type, so always check the specific deadlines printed on your denial letter.
The Bottom Line
A denial is a starting point for negotiation, not the end of the road. Between your right to an internal appeal and an independent external review, you have real leverage especially with a clear, well-documented letter from your therapist backing you up. Don’t let the first “no” stop you from getting care you are entitled to.
