How to Dispute a Medical Bill

A confusing bill is worth checking before you pay. Start by matching the bill to the EOB, service dates, and itemized charges. This guide gives you a practical review sequence without assuming that every unusual line is an error.

Step 1: Get the itemized bill

The bill you received in the mail is a summary. It lumps charges together. You want the itemized statement, also called the UB-04 for hospital bills or the CMS-1500 for physician charges. Every line has a CPT or HCPCS code and a dollar amount.

Call the billing department and ask for an itemized bill in writing. Ask when it will arrive and how to follow up. Do not assume the No Surprises Act creates a universal 30-day itemized-bill deadline; rights and timelines depend on the bill, payer, provider, and state.

Step 2: Check every code

Once you have the itemized bill, you are hunting for four things:

• Duplicate charges — the same CPT code billed twice on the same day, usually without a modifier justifying it. This is the single most common error.
• Upcoding — a less intense service billed as a more intense one. Example: a 15-minute office visit (99213) billed as a 40-minute visit (99215) at triple the price.
• Unbundling— procedures that are supposed to be grouped together but were split into separate line items to inflate the total. The NCCI edits define which codes can't be billed together.
• Phantom services — procedures listed that never happened. Cross-check against your discharge summary.

For each code, confirm the date, service setting, locality, and code details before using a CMS fee schedule as a reference. A gap between the billed amount and a Medicare reference is a question to raise, not proof that the charge is wrong or unreasonable.

Step 3: Build your legal case

A dispute letter that cites specific law gets answered. A dispute letter that just says "this is too much" gets ignored. Use these references depending on your situation:

• No Surprises Act (2022) — protects against out-of-network billing at in-network facilities, and gives you the right to a good-faith estimate before any scheduled service over $400.
• Fair Debt Collection Practices Act (FDCPA) — if the bill has been sent to collections, you have 30 days from first contact to demand debt validation in writing. Until they validate, they cannot continue collections.
• Hospital charity care (IRS 501(r))— nonprofit hospitals are legally required to provide financial assistance to patients under a published income threshold. Most patients never apply because they don't know it exists.
• State-specific rights — every state has its own billing protections. California, New York, Texas, and Florida have particularly strong consumer protections.

Step 4: Send the dispute letter

A good dispute letter is:

• In writing, sent certified mail or fax (not email unless they respond to email)
• Specific — references line items, CPT codes, and dollar amounts
• Grounded in law — cites the relevant federal or state statute
• Firm but professional — no threats, no profanity, no emotion
• Dated and signed, with a reasonable follow-up date for a written response

The analyzer helps identify possible review points from your bill. Pro letter drafts are gated; you still review, edit, and verify any wording before sending it.

Step 5: Escalate if ignored

If the provider does not respond in 30 days, or responds dismissively, you have three escalation paths:

1. State insurance commissioner complaint — file online in 10 minutes. The commissioner will open a file and the provider has to respond in writing, which they take more seriously than your letter.
2. CFPB complaint — the Consumer Financial Protection Bureau handles medical debt collection issues. File at consumerfinance.gov. Creates a formal record and often results in resolution.
3. Small claims court — for disputes under roughly $10,000 (varies by state), you can file directly. Filing fees are low, lawyers not required, and many providers settle rather than show up.

Common mistakes that kill your dispute

• Paying a partial amount while disputing — this can be interpreted as accepting the bill. Dispute first, pay nothing, then pay the corrected amount.
• Waiting too long — provider dispute windows are often 90-180 days. After that, your options shrink fast.
• Calling instead of writing — phone calls leave no record. Every call should be followed by a written summary sent certified mail.
• Giving up after one "no" — the first response is almost always a denial. Escalate.

Frequently asked questions