Claude found double billing and cut a hospital bill down from $195,000

Matt Rosenberg received a hospital bill of around $195,000 after his brother-in-law died of a heart attack four hours after admission. Using Claude, he went through the detailed billing codes and negotiated the amount down sharply.

What they built

Rosenberg first obtained an itemized bill with standard CPT codes and gave it to Claude. Claude flagged double billing under Medicare rules, inpatient codes even though the patient was never admitted, and a ventilator charge that may not be billed on the same day as critical care. With Claude, he then wrote a letter demanding payment at Medicare rates. He checked the key findings himself and also used ChatGPT.

The result

The hospital gave in, and the bill ended up at $33,000–37,000 instead of around $195,000.

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