Real AI agent use cases, with sources and setup prompts

How to check a medical bill for errors and appeal an insurance denial with AI

Short answer: Ask the provider for an itemized bill with billing codes (CPT/HCPCS) and get the matching Explanation of Benefits (EOB) from your insurer. Remove your name, member ID and date of birth, then have ChatGPT or Claude compare them line by line for duplicate charges, wrong quantities, unbundled codes and care you never got, and price-check the codes on FAIR Health Consumer. For a denied claim, Fight Health Insurance or Counterforce Health (both free) draft the appeal letter from your denial letter; file the internal appeal within 180 days, and if it's upheld, request an independent external review within 4 months. Uninsured or self-pay and billed at least $400 over your good faith estimate? Dispute it with CMS within 120 days ($25 fee). At a nonprofit hospital, also apply for financial assistance.

Real setups: a Grok Bot medical bill auditor, a finance agent that found a year-old surgery bill in collections, an agent that files insurance claims from receipts, and a Show HN app that strengthens insurance appeals. 4 matching use cases below, each with a public source.

Looking for something else? Search all 1965 use cases or .

What you need

ToolWhat it does herePriceLink
Fight Health InsuranceDrafts insurance appeal letters from your denial letter, mostly open source. Has a free connector (MCP) for Claude, ChatGPT, Claude Code and Codex that looks up appeal rules, state help and insurer appeal contacts. Warns that drafts can contain wrong citations.Free / pay what you want; optional fax feeOfficial site
Counterforce HealthAI appeal letters from your denial letter, plus free one-on-one case help for complex cases; funded by NIH and University of Pennsylvania grants.Free for individualsOfficial site
ChatGPTReads uploaded bills and EOBs (PDF or photo), checks them line by line and drafts letters. Paid plans can add Fight Health Insurance as a custom MCP server.Free; Plus $20/moOfficial site
ClaudeSame bill and EOB review; any plan, including Free, can add one custom connector such as Fight Health Insurance.Free; Pro $20/mo ($17/mo billed yearly)Official site
FAIR Health ConsumerLook up typical in-network and out-of-network prices for a CPT code in your ZIP code to spot inflated charges.FreeOfficial site
Medicare Physician Fee Schedule Look-UpOfficial Medicare payment amounts per code and location: a floor for what a fair price looks like.FreeOfficial site
Dollar ForNonprofit that screens hospital bills for charity care and helps you apply for the hospital's financial assistance.FreeOfficial site
OllamaRuns an AI model on your own computer so bills never leave it.FreeOfficial site

Prices are from each official page, checked Oct 27, 2026; they exclude tax and can change. Swipe the table sideways on a phone.

Audit a medical bill for errors with ChatGPT or Claude

About 30-60 minutes once you have the documents. Works on free plans. You need the itemized bill and the EOB for the same dates of service.

  1. Request the itemized bill and your billing records. Call or message the billing office, or send this through the patient portal. HIPAA gives you a right to your billing records; the provider has 30 days to respond (one 30-day extension allowed).
    text
    Subject: Request for itemized bill and billing records - account [ACCOUNT NUMBER]
    
    Please send me a fully itemized bill for my care on [DATE(S) OF SERVICE] at [FACILITY], showing for every line:
    - the date of service
    - the CPT or HCPCS code (and revenue code for hospital bills)
    - the description and quantity
    - the charge, insurance payments, adjustments and my balance
    
    Under HIPAA's right of access (45 CFR 164.524), I also request a copy of my billing records for these dates.
    
    Please place this account on hold while I review it.
    
    Thank you,
    [YOUR NAME]  [PHONE]
  2. Download the EOB. Log in to your insurer's website or app, open Claims, and download the Explanation of Benefits for the same dates of service. It lists what was billed, what the plan allowed, what it paid and what you owe.
  3. Remove personal details. Consumer AI chats aren't covered by HIPAA. Redact before you upload; the AI only needs the numbers and codes.
    text
    Black out or delete before uploading:
      name, address, phone, email
      date of birth, Social Security number
      insurance member ID, group number
      account / MRN / claim numbers (replace with [ACCT], [CLAIM])
    
    Keep:
      dates of service, CPT/HCPCS/revenue codes, descriptions,
      quantities, charges, allowed amounts, payments, adjustments,
      patient responsibility, denial reason codes
  4. Run the audit. Start a new chat, upload both files and paste the 'Audit my itemized bill against my EOB' prompt below. Ask it to quote the exact line for every problem so you can check it.
  5. Price-check the codes. For each large line, search the CPT/HCPCS code on FAIR Health Consumer with your ZIP code and on the Medicare Physician Fee Schedule Look-Up. A charge several times the typical in-network price is worth questioning, especially if you're uninsured or out of network.
  6. Prefer to keep it on your computer?. Run the same prompt with a local model. Smaller models make more mistakes, so double-check every flagged line.
    shell
    # macOS (Homebrew)
    brew install poppler ollama
    # Debian/Ubuntu: sudo apt install poppler-utils, then install Ollama from ollama.com/download
    
    ollama pull qwen3:8b
    pdftotext -layout itemized-bill.pdf bill.txt
    pdftotext -layout eob.pdf eob.txt
    
    # paste the audit prompt from this guide into prompt.txt first
    ollama run qwen3:8b "$(cat prompt.txt) ITEMIZED BILL: $(cat bill.txt) EOB: $(cat eob.txt)"
  7. Send the dispute. Use the patient portal or a letter you can track, keep a copy, and write down who you spoke to and when on every call.
    text
    Subject: Billing dispute - account [ACCT], dates of service [DATES]
    
    I reviewed my itemized bill against my insurer's Explanation of Benefits and found these problems:
    
    1. Line [#], [CODE] [DESCRIPTION], [DATE]: charged [TIMES] times; my records show [ONE].
    2. Line [#], [CODE]: billed to me, but my EOB shows patient responsibility of $[AMOUNT].
    3. Line [#], [CODE]: [service I did not receive / dated after discharge].
    
    Please correct these lines, send a revised itemized bill, and keep the account out of collections while this is reviewed.
    
    [YOUR NAME]  [PHONE]

    If the bill is an out-of-network surprise from an emergency or an in-network hospital, also file a complaint at cms.gov/medical-bill-rights/help/submit-a-complaint or call 1-800-985-3059.

Appeal an insurance denial with Fight Health Insurance in Claude or ChatGPT

For any denied claim or prior authorization. You need the denial letter, your plan documents and, ideally, a letter from your doctor. Nothing is sent to your insurer until you send it.

  1. Note your deadlines. Most plans: internal appeal within 180 days of the denial notice. The insurer decides within 30 days (care not yet received), 60 days (care already received) or 72 hours (urgent). Your state's Consumer Assistance Program can file the appeal for you for free.
  2. Connect Fight Health Insurance to your assistant. Free, no account or API key. In the chat apps:
    text
    Claude (web or desktop, any plan):
      Customize > Connectors > + Add > Add custom connector
      Name: Fight Health Insurance
      MCP server URL: https://www.fighthealthinsurance.com/mcp
      Authentication: No sign in
    
    ChatGPT (web, Plus/Pro/Business):
      chatgpt.com/plugins > Add > Create custom MCP server
      (if missing: Settings > Security and login > Developer mode on)
      Server URL: https://www.fighthealthinsurance.com/mcp
      Authentication: No authentication
      Then type @Fight Health Insurance in a chat
  3. Or from the command line.
    shell
    # Claude Code
    claude mcp add --transport http fight-health-insurance https://www.fighthealthinsurance.com/mcp
    
    # Codex CLI
    codex mcp add fight-health-insurance --url https://www.fighthealthinsurance.com/mcp

    Then start claude or codex and ask, for example: 'Using Fight Health Insurance, my MRI was denied as not medically necessary. Where do I start?'
  4. Get the draft letters. Share the denial letter and accept the offer to swap your name and member ID for placeholders. Fight Health Insurance asks before receiving the letter, then returns up to three draft appeal letters to your chat (or finish on its website). No connector? Upload the denial at fighthealthinsurance.com or counterforcehealth.org instead.
  5. Ask your doctor for a letter of medical necessity. This is often what wins an appeal. Send this through the patient portal:
    text
    Hi Dr. [NAME],
    
    [INSURER] denied [TREATMENT/DRUG/TEST] on [DATE] as "[DENIAL REASON from the letter]". I'm appealing and the deadline is [DATE].
    
    Could you write a letter of medical necessity covering:
    - my diagnosis and how long I've had it
    - treatments already tried and why they failed or can't be used
    - why [TREATMENT] is needed now and the risk of not having it
    - any guidelines or studies that support it
    
    Please send it to me or fax it to [APPEALS FAX] with claim [CLAIM #]. Thank you!
  6. Check, edit and send it yourself. Verify every study, guideline and law the letter cites; AI drafts can invent citations. Fill in the placeholders, attach the doctor's letter and records, and send it through the channel on the denial letter (portal, fax or mail). Keep proof of the date sent.
  7. If it's denied again, request an external review. You have 4 months after the final denial. Standard reviews are decided within 45 days, urgent within 72 hours, and the insurer must follow the decision. Any state fee is at most $25 and refunded if you win.
    text
    Subject: Request for external review - claim [CLAIM #]
    
    My plan, [PLAN NAME], issued a final adverse determination on [DATE] upholding the denial of [SERVICE]. I request an independent external review.
    [Add "expedited" and why if waiting would seriously harm my health.]
    
    Enclosed: the final denial letter, my internal appeal, my doctor's letter of medical necessity, and the relevant medical records.

Uninsured, self-pay or can't afford it: dispute the estimate and ask for financial assistance

For bills you're paying without insurance, or any hospital bill you can't afford. Both routes can cut the amount you owe even when there's no billing error.

  1. Check whether you can use the federal dispute process. If you scheduled care at least 3 business days ahead (or asked for one), the provider owed you a good faith estimate.
    text
    Before you start, check:
      Care was on or after Jan 1, 2022
      You were uninsured or chose not to use insurance (self-pay)
      You got a good faith estimate (GFE) in writing
      Bill total minus GFE for that provider >= $400
      Within 120 calendar days of the first bill
    
    File at: cms.gov/medical-bill-rights/help/dispute-a-bill
    Help desk: 1-800-985-3059
    Fee: $25 (deducted from what you owe if you win)
  2. Ask a nonprofit hospital for financial assistance. Nonprofit hospitals must have a financial assistance policy and accept applications for at least 240 days after the first bill after discharge. They can't start extraordinary collection actions (like credit reporting or lawsuits) for 120 days. Dollar For can screen your eligibility for free.
    text
    Subject: Financial assistance application - account [ACCT]
    
    Please send me your Financial Assistance Policy, the plain-language summary and the application for my account [ACCT] (dates of service [DATES]).
    
    While my application is pending, please pause collection activity on this account.
    
    Household size: [#]   Annual household income: $[AMOUNT]
  3. Negotiate what's left. Use the 'Negotiate a self-pay balance' prompt to prepare: ask for the self-pay or prompt-pay discount, a price closer to the FAIR Health or Medicare amount, and an interest-free payment plan. Get any agreement in writing before you pay.

Copy-paste prompts

Written for this setup. Replace anything in [brackets] before you send it.

1. Audit my itemized bill against my EOB

You have both documents, with personal details removed.

I've uploaded my itemized medical bill and my insurer's Explanation of Benefits (EOB) for the same dates of service. Act as a careful medical billing auditor.
1. Make a table matching every bill line to an EOB line: date, CPT/HCPCS/revenue code, description, quantity, billed, allowed, plan paid, my responsibility.
2. Flag: duplicate charges, quantities that don't fit the stay, charges dated after discharge, unbundled codes that are normally billed together, lines missing from the EOB, and any amount I'm billed above the EOB's patient responsibility.
3. For each flag, quote the exact line, explain why it may be wrong in plain words, and rate your confidence (high/medium/low).
Don't guess what a code means; if you're unsure, say so and tell me what to ask the billing office.

2. Explain my EOB in plain English

An EOB or denial letter you don't understand.

Explain this Explanation of Benefits line by line in plain English: what was billed, what my plan allowed, what it paid, what went to my deductible, coinsurance or copay, and what I actually owe. Translate every reason or remark code (like CO-97 or PR-1) into a sentence. Then tell me which lines, if any, look like they were denied and could be appealed, and what information the insurer probably wants.

3. Price-check the codes on my bill

After the audit, for the biggest charges.

Here are the codes and charges from my bill: [CODE - DESCRIPTION - CHARGE, one per line]. My ZIP code is [ZIP] and I'm [insured in network / out of network / uninsured].
For each code, tell me what to search on FAIR Health Consumer and the Medicare Physician Fee Schedule Look-Up, what range would be normal, and which charges look high enough to question. Don't make up prices: give me the lookups to do, and I'll paste the results back.

4. Write my billing dispute letter

You've confirmed specific errors.

Write a short, polite but firm billing dispute letter to [PROVIDER] for account [ACCT]. Errors I've confirmed: [paste the flagged lines and why each is wrong].
Ask them to correct each line, send a revised itemized bill, and keep the account out of collections while it's reviewed. Number the issues, include the dates and codes, keep it under one page, and end with a 30-day response request. Use placeholders for my name and contact details.

5. Draft my insurance appeal (with Fight Health Insurance)

Claude or ChatGPT with the Fight Health Insurance connector on.

Using Fight Health Insurance, help me appeal this denial. [Paste the denial letter with name and member ID replaced by placeholders.]
First tell me which appeal rules apply to my plan type, my deadline, and the insurer's appeal contact. Then get draft appeal letters. Before you send my letter anywhere, show me exactly what you'll send and wait for my OK. After the drafts come back, list every study, guideline or law each letter cites so I can verify them.

6. Write the appeal myself, without a connector

Any AI chat.

Write a first-level internal appeal letter to [INSURER] for claim [CLAIM #], denied on [DATE] for: "[exact denial reason]". Treatment: [WHAT]. Diagnosis: [WHAT]. Treatments already tried: [LIST]. My doctor supports it because: [REASONS].
Address the exact denial reason, quote the relevant part of my plan document [paste it], request a full review by a qualified clinician, and ask for a copy of the claim file and criteria used. Don't cite any study or guideline unless I've given it to you; leave [CITATION] placeholders instead.

7. Prepare a phone call with billing or my insurer

Before you call.

I'm calling [billing office / insurer] about [the problem]. Give me a call script: how to open, the 5 most important questions to ask, what to say if they say it's correct or refuse, how to ask for a supervisor, and what to request in writing. Add a note-taking template for the date, time, rep's name, reference number and what they promised.

8. Negotiate a self-pay balance

Bill is correct but you can't pay it all.

I owe [AMOUNT] to [HOSPITAL/PROVIDER], a [nonprofit / for-profit] hospital, for [SERVICE]. My household income is about [AMOUNT] for [#] people, and I can afford about [AMOUNT] a month. FAIR Health shows a typical price of about [AMOUNT].
Write a script and a short letter asking for (1) financial assistance screening, (2) a self-pay or prompt-pay discount toward the typical price, and (3) an interest-free payment plan, in that order. Remind me to get the final agreement in writing.

Safety checklist

Related guides: How to negotiate bills and get refunds with an AI agent · How to scan and organize receipts and paperwork with AI (ChatGPT, Paperless-ngx) · How to use AI agents for fitness and health · How to run a private ChatGPT at home on your own computer (Ollama + Open WebUI) · How to use AI for taxes, bills and budgets: build a budget from bank CSVs, catch bill increases and check your tax return · How to review contracts, leases and fine print with AI

What it costs

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Real examples (4)

Common questions

How do you check a medical bill for errors and appeal an insurance denial with AI?
Ask the provider for an itemized bill with billing codes (CPT/HCPCS) and get the matching Explanation of Benefits (EOB) from your insurer. Remove your name, member ID and date of birth, then have ChatGPT or Claude compare them line by line for duplicate charges, wrong quantities, unbundled codes and care you never got, and price-check the codes on FAIR Health Consumer. For a denied claim, Fight Health Insurance or Counterforce Health (both free) draft the appeal letter from your denial letter; file the internal appeal within 180 days, and if it's upheld, request an independent external review within 4 months. Uninsured or self-pay and billed at least $400 over your good faith estimate? Dispute it with CMS within 120 days ($25 fee). At a nonprofit hospital, also apply for financial assistance.
Can AI find errors in my medical bill?
Yes, if you give it the itemized bill with CPT/HCPCS codes and your EOB. ChatGPT and Claude are good at spotting duplicate lines, quantities that don't make sense, charges after discharge and lines the insurer denied that you're being billed for. They can misread codes, so check each flagged line against the code description and ask the billing office before you assume it's wrong.
Is it safe to upload my medical bill to ChatGPT or Claude?
Consumer AI chats are not covered by HIPAA. Black out your name, address, date of birth, member ID, account number and Social Security number first; the codes, dates and amounts are all the AI needs. To keep everything on your computer, run a local model with Ollama.
How long do I have to appeal a health insurance denial?
For most US plans, 180 days from the denial notice for the internal appeal. The insurer must decide within 30 days for care you haven't had yet and 60 days for care you already got (72 hours if urgent). If the denial is upheld, you have 4 months to request an external review.
What is an external review?
An independent reviewer, not your insurer, decides whether the denial was right. Standard reviews are decided within 45 days and urgent ones within 72 hours, and the insurer must accept the result. Any state fee is at most $25 and is refunded if you win.
Are the AI appeal tools really free?
Fight Health Insurance is free or pay-what-you-want (faxing is an optional small fee) and works without an account through its connector for Claude and ChatGPT. Counterforce Health is free for individuals and says it takes no insurer money. Both write drafts you check and send yourself.
What if I'm uninsured and the bill is far above the estimate?
If you got a good faith estimate and the bill is at least $400 more, you can start a patient-provider dispute with CMS within 120 days of the bill. The fee is $25. You can also call the No Surprises Help Desk at 1-800-985-3059.
Can a hospital bill hurt my credit?
Equifax, Experian and TransUnion don't report paid medical collections, medical collections under $500, or medical debt less than a year old. The 2025 federal rule removing all medical debt from credit reports was struck down, so larger unpaid bills can still appear. Nonprofit hospitals must give you at least 240 days to apply for financial assistance.
Which AI tools do people use to check a medical bill for errors and appeal an insurance denial?
Across the 4 sourced use cases in this guide, the most used tools are Grok Bot, Claude Duet, Gemini, Muse.
How much does it cost to get started?
0 of the 4 use cases can start on a free plan. The most common paid starting price is $30/mo (2 use cases). Prices come from each tool's official pricing page.
How long does setup take?
1 of the 4 use cases lists a setup time of an hour or less. Each card shows the setup time the builder reported.
Are these real examples?
Yes. Every use case links to its public source (an X post, a Hacker News thread or a GitHub repo) with the author and date, so you can check it yourself.

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