How to dispute a medical bill.

Step 01

Get the itemized bill.

Most hospitals send a "summary" bill by default. It shows totals, not line items, and it's much harder to dispute because you can't see what you're being charged for.

Call the hospital's billing department and say exactly this: "I'd like to request a fully itemized bill with CPT and HCPCS codes for every charge. I understand this is required to be provided free of charge under federal regulations." They will mail or email it within 7-10 business days.

If they push back, cite the federal requirement (42 CFR 482.13 plus the Patient's Bill of Rights at most hospitals). Don't pay anything until you have the itemized version.

Step 02

Find the hospital's MRF.

The MRF is a JSON or CSV file the hospital is required to publish. There are two ways to find it:

Easier: open Itemized, search the procedure you had, find the hospital's row, and click the link in the row-expand. Itemized has already parsed and normalized the prices, so this is the path of least resistance.

Direct: visit {hospital-website}/cms-hpt.txt. For example, cedars-sinai.org/cms-hpt.txt. That file lists the URL of the current MRF. Follow the link, download the file. The raw file is large (often hundreds of MB) and requires technical skill to parse, which is why we built Itemized.

Step 03

Match each CPT code to its published rate.

For every line on your bill, find the same code in the MRF. Make a spreadsheet (or just a piece of paper) with these four columns:

• CPT/HCPCS code from the bill
• Description from the bill
• Amount billed
• Published rate from the MRF (cash-pay AND your insurer's negotiated rate)

This is the most tedious step. Expect 30-60 codes on a typical hospital bill. For each one:

• Search the MRF for the exact CPT/HCPCS code (5 digits for CPT, alphanumeric for HCPCS).
• Note the cash-pay rate. This is the price an uninsured patient would pay.
• Note the negotiated rate for your insurer (e.g., Aetna PPO, BCBS HMO, etc.).
• If a code is on the bill but NOT in the MRF, flag it. The hospital may be required to publish a rate for any code they bill for, depending on the procedure type.

If your hospital is in our dataset, you can save 80% of this work by using the comparison tool on Itemized. Search the procedure, find your hospital's row, expand it. The plan-by-plan negotiated rates are right there.

Step 04

Identify the disputable charges.

Three categories of disputable charges in roughly the order you'll find them:

4a. Charge exceeds the published rate

If you were billed $4,200 for a CPT 73721 (knee MRI) but the hospital's MRF shows their cash-pay rate is $1,800 and their Aetna PPO rate is $1,400, you have a clear discrepancy. The hospital must, at minimum, justify the difference. They usually can't, because they're required to honor what they published.

4b. Code upcoding

Compare the CPT codes on your bill against what your doctor's notes describe. A 99214 (a 25-30 minute "moderate complexity" visit) billed for what was clinically a 99213 (a 15-20 minute "low complexity" visit) is a 30-40% overcharge for office visits. Look at the time you actually spent and the complexity of the discussion.

Imaging studies are also frequently upcoded. A standard CT abdomen (74176) billed as a CT abdomen+pelvis with contrast (74178) is a 2-3× overcharge. The radiology report should specify exactly what was scanned.

4c. Surprise out-of-network charges

If you went to an in-network facility, the No Surprises Act (2022) generally protects you from out-of-network bills from radiologists, anesthesiologists, pathologists, ER physicians, and other facility-based providers. If a non-emergency provider was out-of-network and you didn't sign a written notice and consent form at least 72 hours before the procedure, the bill is likely disputable.

Symptoms: a separate bill from a doctor or group you don't recognize, with a higher patient responsibility than the EOB shows.

Step 05

Write the dispute letter.

Tone: formal, factual, citing federal law, not adversarial. Hospitals process these. The reps reading your letter aren't out to get you. They want to close the file.

Include these sections, in this order:

• Identifying info: your name, account number, date of service, billing date.
• Reason for dispute: "I believe the following charges exceed the published rates in your machine-readable file as required under 45 CFR 180.50."
• Itemized comparison: a table with each disputed line, the amount billed, the published rate, and the difference.
• Specific requests: "I request that the bill be corrected to reflect the published rates, that any payments already made beyond the published rate be refunded, and that the corrected bill be re-submitted to my insurer for processing."
• Deadline: 30 days for a written response.
• What you'll do if unresolved: "If unresolved, I will file complaints with the Centers for Medicare and Medicaid Services (the agency enforcing 45 CFR 180.50), my state attorney general, and the Consumer Financial Protection Bureau."

Use the template below as a starting point. Adapt the specifics. Don't copy verbatim — letters that read like form letters get ignored.

[Your name]
[Your address]
[Your phone]
[Your email]

[Date]

[Hospital billing department address]
Attn: Patient Financial Services / Billing Manager
CC: Compliance Officer

Re: Dispute of charges
Account number: [account #]
Patient: [patient name]
Date of service: [date]
Billing date: [bill date]

Dear Sir or Madam,

I am writing to formally dispute portions of the bill referenced above.
On review, several charges appear to exceed the rates [Hospital name]
publishes in its machine-readable file (MRF) as required under the
Hospital Price Transparency Rule (45 CFR 180.50).

The MRF I reviewed is located at:
[URL of the hospital's MRF]

The disputed charges are as follows:

CPT/HCPCS  | Description       | Billed     | Published rate | Difference
-----------+-------------------+------------+----------------+-----------
[code]     | [description]     | $[amount]  | $[rate]        | $[diff]
[code]     | [description]     | $[amount]  | $[rate]        | $[diff]
[code]     | [description]     | $[amount]  | $[rate]        | $[diff]

Total disputed amount: $[sum]

I request the following:

1. That [Hospital name] correct the bill to reflect the rates published
   in the MRF.
2. That any payments already remitted beyond the published rate be
   refunded.
3. That the corrected bill be re-submitted to my insurance carrier for
   processing as appropriate.
4. That all collection activity on the disputed amount be suspended
   while this dispute is reviewed, per the Fair Debt Collection
   Practices Act.

I request a written response within 30 days of receipt of this letter.

If this dispute is not resolved within 30 days, I intend to file
formal complaints with:
  - The Centers for Medicare and Medicaid Services
    (https://www.cms.gov/hospital-price-transparency)
  - The Office of the Attorney General, [your state]
  - The Consumer Financial Protection Bureau

Thank you for your prompt attention to this matter.

Sincerely,

[Your signature]
[Your printed name]

Enclosures:
  - Copy of itemized bill
  - Comparison table referencing MRF rates
  - Copy of insurance EOB

Step 06

Send, follow up, escalate.

Send. Mail certified, return receipt requested. Pay the $4 for tracking. Keep the green slip. Email a copy to the billing department too if you have an address.

Wait 30 days. Most hospitals respond within two weeks. Some take the full 30. If you hear nothing in 30 days, send a follow-up letter referencing the original (same content, "this is my second request").

Escalate (if needed). Three places to file:

• CMS Hospital Price Transparency complaint: cms.gov/hospital-price-transparency. CMS can fine hospitals that don't comply with the disclosure rule. They take complaints seriously.
• Your state attorney general: google "[your state] attorney general consumer complaint." Most states have an online form. Healthcare billing complaints get prioritized.
• Consumer Financial Protection Bureau: consumerfinance.gov/complaint. The CFPB handles medical-debt collection complaints and forwards them to the hospital with a deadline to respond.

The escalation step alone resolves the dispute in most cases. Hospitals don't want regulatory complaints on their record.