Got a medical bill? Check it against your EOB before you pay

Type in the bill's line items and your insurer's Explanation of Benefits (no names or member IDs); get mismatches, plain-word terms and a short script for the billing office.

What it does

No bot required. CMS, the federal agency behind Medicare and the No Surprises Act help desk, suggests a few checks before you pay a medical bill. Ask the provider's billing department for a detailed bill that lists each item and service. If you used insurance, get your Explanation of Benefits (EOB) from your insurer and make sure the "your share" amount matches the bill. You can also ask for your medical records and compare them, since you shouldn't be billed for anything that isn't in your records (some offices charge a records fee). Watch for double billing, which CMS says is especially common when more than one provider was involved. You can also look up each billing code online and check that it matches the care you got. The No Surprises Act (in effect since January 1, 2022) protects people with most private insurance from surprise out-of-network bills for emergency room visits, for care from an out-of-network provider at an in-network hospital, hospital outpatient department or ambulatory surgery center, and for air ambulance rides. In the ER, you can't be charged more than your plan's in-network cost-sharing. Ground ambulances generally aren't covered unless your state's law says so. Signing a "notice and consent" form gives up those protections, and signing it is your choice. Medicare, Medicaid, TRICARE, VA and Indian Health Service coverage already protect you from some surprise bills. If you didn't use insurance, you can usually get a good faith estimate when you schedule care at least 3 business days ahead, and if the bill is at least $400 more than the estimate, you may be able to dispute it within 120 days of the first bill, for a $25 fee. If paying is the problem, CMS says nonprofit hospitals must offer financial assistance to eligible patients, so ask about payment plans and a lower bill, and write down who you talked to and any reference numbers. Type the bill and EOB numbers into any chat AI (leave out names, member IDs and account numbers) and it lines them up, flags what doesn't match and drafts your questions. It can't tell you that you don't owe something. The billing office, your insurer or the No Surprises Help Desk (1-800-985-3059) can.

Copy-paste prompt

No bot needed: paste this into Grok, ChatGPT, or Claude.

Help me check a medical bill before I pay it. Use CMS's "Check your medical bill for errors," "Know your medical bill rights when using insurance," "Dispute a medical bill" and "Apply for medical bill financial assistance" pages as background. Explain; don't give legal advice, and don't tell me I don't owe something.

Did I use insurance for this care: [yes / no / not sure]. Type of plan: [job-based or Marketplace / Medicare / Medicaid / TRICARE / VA / none].
From the bill (no names, member IDs or account numbers): date of service, provider type (hospital, doctor, lab, ambulance), and each line: code, description, charge.
[paste lines]
Total billed: [ ]; amount due: [ ]
From my Explanation of Benefits (if I have one), for the same dates: billed, allowed, plan paid, "your share" or "you may owe," and any denial reason.
[paste lines]
Was this an ER visit, an in-network hospital or surgery center, or an air or ground ambulance: [ ]. Did I sign a "notice and consent" form: [yes / no / not sure].

1. Line up the bill and the EOB. Flag any line where my bill asks for more than the EOB's "your share," anything billed twice, and anything on the bill that isn't on the EOB.
2. Explain each term I'll see (allowed amount, deductible, copay, coinsurance, adjustment, denied) in one plain sentence.
3. Ask me questions to see whether No Surprises Act protections might apply (ER care; out-of-network provider at an in-network hospital, outpatient department or surgery center; air ambulance; whether I signed a notice and consent form; ground ambulance usually isn't covered unless my state's law says so). Tell me to confirm with the No Surprises Help Desk (1-800-985-3059) instead of deciding for me.
4. If I didn't use insurance, ask whether I got a good faith estimate. If the bill is at least $400 more than the estimate and the first bill is less than 120 days old, explain the dispute process and its $25 fee.
5. Draft a short phone script and a written request for an itemized bill, with my questions, and a line asking about financial assistance, a payment plan or a lower bill if I need it. Remind me to write down who I talked to and any reference numbers.
6. If my insurer denied part of the claim, remind me to follow the appeal steps in my plan documents and the denial notice.

What you need

• Any chat AI (Grok, ChatGPT, Claude)
• Your itemized bill
• Your Explanation of Benefits (EOB) from your insurer, if you used insurance

Sources

• CMS: Check your medical bill for errors
• CMS: Know your medical bill rights when using insurance (No Surprises Act)
• CMS: Dispute a medical bill (good faith estimate, $400, 120 days)
• CMS: Apply for medical bill financial assistance
• CMS: Talk to your provider about your medical bill
• Related: Open enrollment: compare your job's health plans
• Related: Write a calm complaint letter that gets an answer

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