Fewer than 1% of denied claimants appeal — and of those who do with a proper letter, 57–80% succeed. The right tool makes all the difference.
We compared AI letter generators, nonprofit patient advocates, regulatory complaint systems, insurance broker networks, and hospital-side advocates to give you an honest picture of what works and when.
Start My Free Appeal →We cover what each tool does, who it's best for, what it costs, and its limitations — honestly.
These tools aren't mutually exclusive. Here's a recommended sequencing approach depending on your situation.
Generate your internal appeal letter with ClaimBack. If your denial is from a hospital, simultaneously ask their patient financial advocate to help. File the internal appeal first — this is legally required before most other escalation paths open to you.
If your internal appeal is denied, request external review from an independent review organization (IRO). In the US, this right is guaranteed under the ACA for most non-grandfathered plans. ClaimBack's Full Fight plan includes escalating letters for this stage.
Simultaneously or after internal review, file a complaint with your state's Department of Insurance. This is free, creates a regulatory record, and often prompts the insurer to take your claim more seriously.
If your case involves a serious illness and you need sustained help, contact the Patient Advocate Foundation for free case management support.
If you've exhausted administrative remedies and the claim amount justifies legal fees, consult an insurance attorney about ERISA litigation or a bad faith claim.
See your appeal grounds, the regulations that protect you, and the strength of your case — free, in 3 minutes, no login required.
Start My Free Appeal →The best tool depends on your situation. For most standard denials — medical necessity, prior authorization, out-of-network — ClaimBack is the fastest and most cost-effective starting point, generating a professionally written, regulation-citing letter in 3 minutes. For serious diagnoses with complex ongoing needs, the Patient Advocate Foundation provides free human case managers. For regulatory escalation after a failed internal appeal, filing with your state insurance commissioner is free and often effective. These tools work best when layered — start with ClaimBack, then escalate as needed.
Yes. ClaimBack offers a free claim analysis with no credit card required. The Patient Advocate Foundation provides free case management for qualifying patients. Filing a complaint with your state insurance commissioner is free. Your hospital's patient financial advocate service is free. NAHU broker referrals are free to look up. The paid portion of most services (like ClaimBack's appeal letter at $12) is substantially less expensive than legal alternatives.
Studies consistently show that 57–80% of internal insurance appeals succeed when supported by a properly documented appeal letter that cites the relevant clinical and regulatory criteria. The critical fact is that fewer than 1% of people who receive a denial actually appeal — meaning the vast majority of denied claims are abandoned without a challenge. Of those who do appeal with a well-structured letter, the majority win.
Start by identifying what you need: if you need a well-written letter quickly, start with ClaimBack. If your case is a serious illness and you need sustained support, contact the Patient Advocate Foundation. If you've already filed an internal appeal and been denied, file a complaint with your state commissioner or request external review. If your denial involves a hospital, call their patient financial advocate. These aren't mutually exclusive — you can use ClaimBack to draft your appeal letter, and simultaneously file with your state commissioner if the situation warrants it.
Yes, with some variation. ClaimBack supports Medicare Advantage and Medicaid plan denials with CMS-specific regulatory citations. The Patient Advocate Foundation works with Medicare patients. State insurance commissioners have limited authority over traditional Medicare (which is federally regulated) but can help with Medicare Advantage plans. For traditional Medicare denials, the appropriate path is through the Medicare appeals process managed by CMS.
ClaimBack provides AI-assisted document drafting. We are not a law firm and do not provide legal advice. Third-party tools listed here are independent organizations. Inclusion does not constitute an endorsement of their specific services. Always verify current pricing, availability, and eligibility directly with the provider.