Steal My Prompt Vol. 39: The Medical Bill Auditor

The bill says you owe four hundred dollars. The Explanation of Benefits from your insurer, for the same visit on the same day, says you owe sixty. Two numbers, one appointment, and nobody has offered to explain the gap.

Medical billing runs on the assumption that you will not check. The codes are opaque, the statements arrive weeks apart, and the math is split across documents nobody designed to be read together. Most people pay the larger number because disputing it feels harder than absorbing it.

Reconciling a coded bill against an EOB, line by line, is tedious enough that almost nobody does it. That is the part this prompt takes off your hands. You paste or upload the itemized bill and the EOB, and it lines them up, surfaces every place the bill asks for more than your insurer says you owe, flags likely errors, and drafts the questions for the billing office. It does not decide who is right. It builds the case so you can.

A medical bill is not a verdict. It is an opening number.

What You Can Use This For

• A maternity or childbirth bill, which bundles dozens of services across providers and is among the most error-prone you will ever get
• A hospital or emergency room bill, where charges pile up fast and an itemized breakdown is rarely provided unless you ask
• Any bill that does not match the EOB your insurer sent for the same care
• A surprise charge from a provider you do not remember seeing, like a separate lab, an anesthesiologist, or a facility fee
• Any bill before you pay it, as a standing habit rather than a one-time fight

How to Use It

Step 1. Pick your tool. Claude, ChatGPT, Microsoft Copilot, or Gemini on the free tier. The prompt is model-agnostic.

Step 2. Get the itemized bill, not the summary. This is the step almost everyone skips. The default statement shows a single total; you want the itemized version that lists every code, charge, and date. Request it from the billing office or the patient portal. You cannot audit what you cannot see.

Step 3. Get the matching Explanation of Benefits from your insurer. It lives in their portal or app under claims, filed by the visit date. The EOB is the document that tells you what you actually owe.

Step 4. Give both to the prompt. Paste the text, or photograph the documents and upload the images. Claude, ChatGPT, Microsoft Copilot, and Gemini all accept photo uploads on the free tier, so a clear picture of a paper bill works as well as typed text. Then run.

Step 5. Read the discrepancies the prompt flags, then contact the billing office with the questions it drafted. Reference the EOB for each line, and ask them to correct or explain it.

Pro tip: Do not pay a medical bill the day it arrives if something looks off. Request the itemized version and run it through the prompt first. A charge can be disputed even in collections, but questioning it before money changes hands is far easier than clawing it back.

The Prompt

You are my medical bill auditor. I am going to give you an itemized medical bill and the Explanation of Benefits, or EOB, that my insurer sent for the same care. I may paste them as text or upload them as photos; if I upload photos, read every line item carefully from the images. Your job is to reconcile the two, find discrepancies, and help me prepare to question the bill. You are an auditor and a question-generator. You do not give medical, legal, or financial advice, and you do not decide who is correct. You surface what does not match and turn it into questions.

Here is what I am giving you:

The itemized bill: [PASTE OR UPLOAD THE ITEMIZED BILL, WITH CHARGES, CODES, AND DATES]

The Explanation of Benefits: [PASTE OR UPLOAD THE EOB FOR THE SAME CARE]

My situation, if relevant: [ANYTHING WORTH KNOWING, SUCH AS A VISIT I DO NOT RECOGNIZE OR A CHARGE I EXPECTED TO BE COVERED]

Work through this in order.

1. Reconcile. Build a table that lines up each charge on the bill against what the EOB says for the same service: amount billed, amount the insurer allowed, amount the insurer paid, and the amount the EOB lists as my responsibility. Place the bill's "amount due" directly beside the EOB's "patient responsibility" so any gap is visible at a glance.

2. Flag the gaps. List every line where the bill asks me to pay more than the EOB says I owe, and state the specific dollar difference on each. This is the highest-value finding.

3. Surface possible errors. Using only what I gave you, point out anything that fits a common billing-error pattern: a duplicate charge, a charge on a date I said I was not there, a service usually bundled into another code but billed separately, or a charge marked as my responsibility that the EOB shows the insurer already paid. Do not assert fraud. Frame each one as something to ask about.

4. Build the dispute. Draft a short, factual message I can send to the billing office. List the lines I am questioning, reference the EOB for each, and request either a corrected bill or a written explanation.

Rules. Use only the documents and information I gave you. Do not invent charges, codes, or amounts. Do not state that a charge is definitely wrong or fraudulent; frame findings as discrepancies and questions. Where a number is missing or unclear, say so rather than guessing. Output clean, labeled text I can act on, with no preamble.

Transparency and Notes

• This prompt reconciles documents and drafts questions. It is not legal or financial advice, and it cannot tell you that a charge is definitively wrong. It shows you where the numbers do not match so you can ask the right questions of the people who can correct them.
• A summary bill cannot be audited. Request the itemized statement, which a reputable billing office will provide.
• Privacy: a medical bill and an EOB carry your name, account numbers, and details about your care. Remove identifiers before pasting or uploading into a consumer AI tool, which is not HIPAA covered.
• Built and tested in Claude, free-tier compatible across the four major tools.
• This is a tool for organizing and questioning a bill. It is not a guarantee of savings and not a substitute for a patient advocate or your insurer's formal appeals process.