80% of medical bills contain errors

They overbilled you.
We prove it.

Fight back. Win. Keep it all.

Start for free →See how it works
Keep every dollar you win
Legal letters in 60 seconds
USPS certified mail
🔒256-bit SSL Encryption
📬USPS Certified Mail
🤖Powered by Claude AI
⚡Results in Minutes
$88B*
medical debt in collections
80%*
bills with billing errors
1 in 3*
americans with medical debt

*Sources: CFPB (2022), Medical Billing Advocates of America, Kaiser Family Foundation (2022)

Built to make them back down

Built to make them back down.

AI bill analysis

Your bill. Every line. Scanned for errors, violations, and overcharges in seconds.

Legal letters generated

Dispute letters written to legal standards. Personalized to your case. Ready to send.

Certified mail delivery

Your letter. Their door. USPS certified mail with return receipt — the paper trail that makes them respond.

Insurance appeal support

Denied claims. Prior auth rejections. We generate the appeal letters that make insurers reconsider.

We don't take a cut

You win it. You keep it.

Most bill-fighting apps take a percentage of your savings. We don't. One flat fee — every dollar you recover goes in your pocket.

ServiceModelCostCut of savings
DoNotPayCharges monthly + upsells$36/mo + feesVaries
TrimTakes a cut of your savingsFree to start15% of savings
Rocket MoneyTakes a cut of your savings$4–12/mo30–60% of savings
BillFighter™Free to start. Flat monthly fee when you upgrade.$0–$19.99/mo0% — you keep 100%

BillFighter also offers a free plan with 5 bill analyses per month — no credit card required. Upgrade to Pro at $19.99/month when you're ready to send certified mail.

Pricing comparisons based on publicly listed plans. We think the math should be simple: you fought, you won, you keep it.

FAQ

Questions, answered.

Yes — disputing bills and requesting debt validation are federally protected rights under the Fair Debt Collection Practices Act (FDCPA) and various state consumer protection laws. You have the right to request an itemized bill, dispute errors, and demand debt validation.

No — sending dispute letters does not affect your credit score.

We track response deadlines and generate follow-up letters automatically.

Never. You keep 100% of everything you recover. We charge a flat $19.99/month, nothing more.

Medical bills, collection notices, EOBs, insurance denials, and prior authorization denials.

BillFighter uses AI to analyze bills and identify potential issues. Our analysis is thorough but not perfect. We recommend reviewing all findings and consulting a consumer rights attorney for complex or high-stakes cases.

Attorneys typically take 30–40% of your recovery. BillFighter charges a flat monthly fee and you keep everything you win. For complex cases, we also connect you with consumer rights attorneys who work on contingency.

How it works

Four steps. That's it.

01

Upload your bill

Take a photo or upload a PDF. Any bill. Any provider. We read every line.

02

Get an instant analysis

Our AI finds what they don’t want you to see — errors, violations, and every dollar you’re owed.

03

Generate and send letters

One click. A legally-sound letter lands in their mailbox via certified mail. Now they have to respond.

04

Track your cases

Every case tracked. Every deadline monitored. Every win recorded. You’ll know when they back down.

Security & Trust

Your privacy is protected.

BillFighter uses 256-bit SSL encryption to protect your documents. Your bills and personal information are never sold or shared with third parties. We are not a covered entity under HIPAA, but we treat your data with the same level of care. You are in control of your information at all times.

Bank-level encryption

All documents encrypted in transit and at rest.

No data selling

Your information is never sold to third parties. Ever.

You're in control

Delete your account and all data at any time.

Fight back. Win. Keep it all.

Stop paying bills you could fight. Stop handing percentages to apps that didn't earn them. Take it back.

Start for free →

Free plan includes 5 bill analyses per month. No credit card required.

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Not legal advice. BillFighter provides tools, not attorneys.