Provider Write-Off

A provider write-off (or contractual adjustment) is the difference between a provider's billed charge and the allowed amount under their network contract with the health plan. When a provider is in-network, they've signed a contract agreeing to accept the negotiated rate as payment in full — anything they billed above the allowed amount gets written off the ledger. The patient never owes that difference.

Write-offs are the reason in-network care is so much less expensive than out-of-network care. A hospital might bill $8,400 for a colonoscopy at its chargemaster rate; the in-network allowed amount might be $1,120; the $7,280 gap is the contractual write-off. That's not a discount the hospital is granting out of goodwill — it's a legal obligation under the network contract they signed with the carrier. Out-of-network providers didn't sign that contract, so the write-off doesn't happen automatically, and the balance-billing question depends on state law and the No Surprises Act. On self-funded plans, the write-off math is directly visible on every claim: the TPA reports the billed amount, the allowed amount (which becomes the plan's cost), and the write-off amount that never left the plan's pocket. This visibility is one of the underappreciated advantages of self-funding — the plan sponsor sees the actual claim economics rather than an aggregated premium.

The takeaway: when reading a medical bill or EOB, the write-off amount is not a real number owed by anyone — it's the difference between the provider's asking price and the contractual reality. Focus on the allowed amount and the patient responsibility.