Skip to content
DenialPath
COVerified

45: Charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement.

The payer is telling you the billed charge is higher than the amount their fee schedule or contract allows for this service. The difference between what you billed and what the payer allows becomes a contractual write off, not something you can bill the patient for when an in network contract is in place.

What the group code means

CO
Contractual Obligation. The provider is responsible and the amount cannot be billed to the patient.

Why it fires

  • Billed charge exceeds the payer's fee schedule or contracted rate for the CPT/HCPCS code
  • No modifier or documentation was included that could justify an exception to the fee schedule
  • Fee schedule updated on the payer side (annual CMS or payer update) and the practice's charge master was not

Corrective actions, ranked

  1. 1

    Verify the contract rate

    Pull the current fee schedule or contract rate sheet for this payer and CPT code and confirm the allowed amount matches what was paid.

  2. 2

    Write off per contract

    If the allowed amount is correct per contract, adjust off the difference. This is a standard contractual adjustment, not an error.

  3. 3

    Check for a fee schedule update lag

    If the payer recently updated its fee schedule, confirm the correct effective date was applied to this date of service.

Is it worth appealing

Low appeal value

Appeal only if you can show the payer used the wrong fee schedule, wrong contract year, or the code is not actually subject to that schedule. Otherwise this is a routine contractual write off and not appealable.

Source:X12 Claim Adjustment Reason CodesVerified

Retrieved 2026-07-18.

Do not let this happen again

Scrub the claim against NCCI PTP and MUE edits before you submit, free and in your browser.

Scrub a claim

DenialPath provides billing and administrative guidance based on published CMS and X12 sources. It is not medical advice, not a coverage determination, and not a guarantee of payment. NCCI and MUE edits are republished quarterly and payer policies vary by contract. Always confirm against the payer's own current policy before submitting or appealing.