How many antidepressants do I need to try before TMS is covered?

It depends on the plan. Many require two to four failed trials from different classes at adequate dose and duration.

Does Medicare cover TMS?

Medicare covers TMS for treatment-resistant depression under local coverage determinations with criteria similar to private plans.

Does insurance cover TMS for OCD or anxiety?

TMS is FDA-cleared for OCD and smoking cessation in addition to depression, but many plans cover it only for depression. Coverage for other uses often needs an appeal.

Can I appeal if I couldn't tolerate the medications?

Yes. Intolerance due to side effects usually counts as a failed trial if it's documented.

TMS Therapy Insurance Denial: How to Appeal

By AppealFlow editorial•5 min read•Published October 2026

Insurers usually cover TMS (transcranial magnetic stimulation) for major depressive disorder only after you've tried a set number of antidepressants without enough benefit, often two to four from different classes, at adequate doses and durations, plus a trial of psychotherapy. Most denials come from incomplete medication history. An appeal that lists each medication, dose, duration and outcome, with a depression rating score, and raises mental health parity where criteria look stricter than for comparable medical care, has the best chance.

What Criteria Do Plans Use for TMS?

Key Takeaway: Get the exact policy; the number of drug trials differs.

Diagnosis of major depressive disorder, often moderate to severe, confirmed by a rating scale such as PHQ-9 or HAM-D
Failure or intolerance of a set number of antidepressants, often from at least two classes, each at an adequate dose for a set period (commonly 6 weeks)
A trial of evidence-based psychotherapy
No contraindications, such as non-removable metal in or near the head
Treatment prescribed by a psychiatrist

Why Was TMS Denied?

Key Takeaway: Almost always paperwork about past treatment.

The plan may say you haven't tried enough medications, that a trial was too short or the dose too low, that psychotherapy isn't documented, or that a repeat course isn't justified. Pharmacy records and old notes can often fill these gaps.

How Do I Appeal a TMS Denial?

Key Takeaway: Build a clean medication timeline.

Ask for the plan's TMS policy and the criteria used.
Ask your pharmacy for a dispensing history; it proves medication names, doses and dates.
With your psychiatrist, make a table: drug, class, dose, start and stop dates, and outcome (no response, partial response, side effects).
Document therapy: provider, type, dates.
Include current rating scale scores and how depression affects work and daily life.
If criteria seem stricter than for comparable medical treatments, raise federal mental health parity. See the mental health denial appeal guide.
File by the deadline and request external review if denied.

What About Repeat TMS Courses?

Key Takeaway: Plans often cover them with evidence of earlier benefit.

Many policies cover a repeat course if the first course produced a clear response (often at least 50% improvement in scores) and symptoms later returned. Keep your scores from the first course; they're the key evidence.

Related Guides

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Sources

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Disclaimer: This article is for educational purposes only and does not constitute medical, legal, or financial advice. Plan terms, state laws, and federal rules vary and change. Check your plan documents and denial notice, and consider a licensed professional or your state consumer assistance program. See our full disclaimer.