How to read an itemized medical bill

An itemized bill lists every service with its billing code, units and price. Reading it line by line is how most billing questions are found. Here is what to ask for, and the questions Med Bill Check raises when it checks a bill.

Checked 28 September 2026 against Medicare's 2026 fee schedule, July 2026 hospital outpatient rates and NCCI Medically Unlikely Edits

Step 1: ask for the itemized bill

Here is a letter asking for an itemized bill with codes and prices, and a hold on collections while you review it. Fill in the bracketed parts and send it yourself. See the letter.

It should show, for each charge, the date, a plain description, the billing code (CPT, HCPCS or revenue code), the number of units and the price, and if insurance was billed, what was billed, paid and adjusted.

Step 2: check each line

• Compare every line with your Explanation of Benefits if you have insurance.
• Look for duplicate lines, services you did not receive, and unit counts that look high.

Look up any code to see what it means and Medicare's rate for it: codes with guides.

What Med Bill Check flags

When you paste several lines, it checks each against Medicare's rate and raises these kinds of questions:

• Units above Medicare's daily limit. Medicare limits (MUE) are the most units Medicare pays automatically for one patient on one day. Going over is a reason to ask, not proof of an error, since some cases are allowed with records.
• The highest visit levels. Level 5 is the highest emergency or office visit level. It asks how the level was chosen and for the notes that support it.
• Hospital clinic facility fees. Code G0463 is a hospital facility fee for a clinic visit. It asks whether the clinic is billed as a hospital department, and whether a lower office rate applies.
• Charges far above what providers bill. It compares each line with what providers typically billed and suggests asking for the itemized price and any self-pay discount.
• Repeated codes. The same code on more than one line is worth a question.

Example: an emergency room bill

Four lines from an ER bill, as Med Bill Check reads them:

Total: $5,665.00 charged, about 4.15 times the $1,364.97 Medicare would pay for the priced lines.

Questions to ask the billing office:

• Code 99284 is charged at about 3.2 times what providers typically bill. Ask for the itemized price and any self-pay discount.
• Code 36415 is billed for 3 units, and Medicare's automated limit for one patient on one day is 2. Ask them to confirm the units.
• Level 5 is the highest emergency visit level, meant for the most complex cases. Ask how the level for code 99285 was chosen and for the notes that support it.

Example: a hospital-owned clinic

Questions to ask:

• Level 5 is the highest office visit level. Ask how the level for code 99215 was chosen and for the notes that support it.
• Code G0463 is a hospital facility fee for a clinic visit. Ask whether the clinic is billed as a hospital department, and whether a lower office rate applies.

Medicare limits (MUE) are the most units Medicare pays automatically for one patient on one day. Going over is a reason to ask, not proof of an error, since some cases are allowed with records. For hospital lines, the Medicare rate is the hospital's facility fee plus the doctor's part. General information, not medical, legal or financial advice. Medicare rates are a common benchmark, not what every plan or provider charges. For your own bill, check with the billing office, your insurer or your doctor.

Step 3: ask in writing

Ask for a charge to be reviewed, ask for a discount or payment plan, or, for a hospital bill, apply for financial assistance. Each letter asks the office to hold the account from collections while it looks.

Your rights

• No Surprises Act. Since 2022, most people with health insurance are protected from surprise bills for most emergency care, for out-of-network providers at in-network hospitals and surgery centers, and for air ambulances. You should only owe your in-network cost sharing. Official page
• Good Faith Estimate. If you are uninsured or not using insurance, providers must usually give you a Good Faith Estimate when you book care at least 3 business days ahead, or when you ask for one. Official page
• Bill above your estimate. If a provider bills at least $400 more than its Good Faith Estimate, you may be able to use the federal patient-provider dispute process. Start within 120 calendar days of the date on the bill. The fee is $25. Official page
• Free help. The No Surprises Help Desk answers questions about these rights on 1-800-985-3059. Official page

Sources

• CMS Medicare Physician Fee Schedule, 2026 (pfs.data.cms.gov)
• CMS Medicare Physician and Other Practitioners by Geography and Service, 2024 data (data.cms.gov)
• CMS NCCI Medically Unlikely Edits, effective 2026-10-01
• CMS Hospital Outpatient Prospective Payment System (OPPS) Addendum B, July 2026 (cms.gov), national unadjusted payment rates
• https://www.cms.gov/nosurprises
• https://www.irs.gov/charities-non-profits/billing-and-collections-section-501r6
• https://www.cms.gov/priorities/key-initiatives/hospital-price-transparency