Fix a preventive visit or screening that was billed as diagnostic
If a checkup or screening was coded as diagnostic, you may be billed for care your plan covers at no cost. AI can spot the coding and script the call.
Part of: How to negotiate a medical bill
1. Copy this prompt
Paste it into ChatGPT, Claude, Gemini or Grok (the free versions work), then replace the [highlighted brackets] with your details. Leave out account numbers and SSNs.
Here is my itemized bill and EOB for a [SERVICE, e.g. annual physical / screening colonoscopy] on [DATE], with personal details removed: [PASTE]. My plan is [PLAN TYPE, e.g. employer plan, ACA marketplace]. 1) Explain each code and modifier in plain English. 2) Tell me whether this looks like it was billed as preventive or diagnostic, and why. 3) List what I should check in my plan documents and on healthcare.gov's preventive services list. 4) Write a short, polite script asking the provider's billing office to review the coding against the visit notes and resubmit if appropriate. Mark anything you're unsure about.
2. Follow these steps
(stored only in your browser; uncheck to erase)
What to expect, and what to do if they say no
What happened when people tried it
Reported The poster says the roughly $600 charge was removed after the call.
What the AI did: A Reddit user had ChatGPT review the billing codes for a routine procedure. It flagged that services were billed as diagnostic rather than preventive, which changed how insurance covered them, and gave a script for calling the clinic.
Source: Reddit r/ChatGPT · 2025 · Self-reported; not independently verified
Why this works
The problem: ACA-compliant plans cover many preventive services at no cost in-network, but a coding choice (diagnostic vs preventive) can turn a free screening into a bill.
How AI helps: A chatbot can read your EOB and itemized bill, explain the codes and modifiers, and write a script asking the provider to review the coding.
Tools & what they cost
| Tool | Cost |
|---|---|
| ChatGPT | Free option available (Paid upgrades exist, but the free version works for this) Free tier; paid plans available |
| Claude | Free option available (Paid upgrades exist, but the free version works for this) Free tier; paid plans available |
| HealthCare.gov: Preventive care benefits | Free (No cost at all) Free |
What do these labels mean?
- Free No cost at all.
- Free option available Paid upgrades exist, but the free version works for this.
- Costs money You pay a set price or subscription.
- Takes a cut of savings Charges a percentage of what it saves you.
- Time · Difficulty Our estimates for a typical first try, not guarantees.
- Reported What the linked source says happened, often self-reported. Your results will vary.
Watch out for
- Sometimes diagnostic coding is correct (for example, if a problem was found or discussed during the visit). Ask for a review; don't insist.
- Preventive coverage rules depend on your plan type and network. Grandfathered and short-term plans may differ.
- Redact identifiers before uploading medical documents.
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Sources
- https://www.reddit.com/r/ChatGPT/comments/1kkwp9s/chatgpt_saved_me_600_by_reviewing_medical_billing/
- https://www.healthcare.gov/coverage/preventive-care-benefits/
Last verified 2026-10-19. Not financial, legal, tax or medical advice. Disclaimer.