Insurance denied your TMS coverage. What's the actual appeal path?

Insurance denials for TMS are common — some insurers deny 30-50% of prior authorization requests — but a real share of those denials get overturned on appeal. Knowing why you were denied is the first step, since the reason shapes your response. Common reasons insurers give: "not medically necessary," treatment-resistant depression criteria not met (many require documented failure of 4+ medications from different classes), the condition isn't FDA-cleared for TMS if you're seeking it off-label, or simply incomplete documentation. The appeals process typically has several levels: an internal appeal (level 1), a second internal appeal with a different reviewer if that's denied, then an external review by an independent organization, and — as a last resort — a complaint to your state insurance commissioner. You generally have 60-180 days from the denial to file, so don't sit on it. A strong appeal letter includes your full medication history with doses and reasons for discontinuation, a letter of medical necessity from your psychiatrist, your current PHQ-9 or similar score, and a direct response to the specific denial reason. Your TMS clinic's billing staff often have appeal templates and experience — ask them before you start from scratch. Patient advocacy groups like NAMI and Mental Health America can also help if you're stuck. https://tmslist.com/blog/tms-cost-insurance-denied-appeal/ Has anyone here successfully appealed a TMS denial? What made the difference — the documentation, the peer-to-peer call, or something else? This is general information, not medical advice.