Calculating Medicare Payments, Write-Offs, Limiting Charges, and Allowed Amounts: Calculate the following amounts for a participating provider who bills Medicare: Submitted charge (based on provider's regular fee for office visit) $75 Medicare physician fee schedule (MPFS) allowed amount $60 Coinsurance amount (paid by patient or supplemental insurance) $12 Medicare payment (80 percent of the MPFS allowed amount) $ Medicare write-off (not to be paid by Medicare or the beneficiary) $