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cowork-medical-bill-auditor

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Point Cowork at a folder of medical bills and insurance EOBs -- matches every bill to its explanation of benefits, catches duplicate charges, balance-billing, and bills that ignore your insurance, then drafts the dispute letters and phone scripts. Most medical bills contain errors; this finds them.

cowork-medical-bill-auditor/SKILL.md

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# Cowork Medical Bill Auditor

Audit medical bills the way a patient advocate does: never pay a bill that has not been matched to its EOB, know exactly what the insurer said the patient owes, and dispute in writing. Input: a folder of provider bills, insurance EOBs (explanation of benefits), and any payment records. This is billing-accuracy support, not medical or legal advice.

## Workflow

1. **Inventory and pair.** Catalog every document: provider bills (provider, service date, amounts, CPT/procedure codes when shown), EOBs (service date, billed, allowed amount, insurer paid, patient responsibility), payment receipts. Match each bill to its EOB by provider + service date + amounts.
2. **Audit each pair.** Check: bill's patient-owed amount vs. the EOB's patient-responsibility line (they must match); charges the EOB shows as insurer-paid or write-off still appearing on the bill; duplicate line items across bills for one visit; charges for services on dates with no corresponding visit; in-network providers billing above the allowed amount (balance billing, prohibited in most network contracts and, for many scenarios, under the No Surprises Act).
3. **Flag the unmatched.** Bills with no EOB (was the claim ever submitted to insurance?) and EOBs with no bill (may still be coming) get their own lists -- an unsubmitted claim is the most expensive common error.
4. **Report.** `bill-audit.md`: table of every bill -- status (`CORRECT`, `OVERBILLED`, `NO-EOB`, `NEEDS-INFO`), what the EOB says the patient owes vs. what the bill demands, and the discrepancy with both documents cited. Lead with total demanded vs. total actually owed per the EOBs.
5. **Draft the disputes.** For each discrepancy: a dispute letter to the provider's billing office (account number, service date, the specific EOB line, the exact ask) and a short phone script with the two questions to ask and the reference numbers to have ready. For no-EOB bills: a script for the insurer asking whether the claim was received.

## Rules
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