CO-256CO group · Benefit

CO-256 denial code: not payable under the managed care contract

CO-256 usually means the money for this service went somewhere else, not that nobody owes it.

CO-256 fires where a service is not separately payable under a managed care contract. Capitation and delegated arrangements are the usual reason: the payment sits with a medical group or IPA rather than with the plan.

What CO-256 means

Under capitation, a group receives a per-member payment covering defined services, and claims for those services are the group's responsibility rather than the plan's. The practical problem is that the delegation is invisible on the member's card. Establishing who holds the risk for this service — the plan or a delegated group — is what determines where the claim should have gone, and it is usually available from the plan's provider services.

Why CO-256 fires

  • The service is capitated to a delegated medical group or IPA.
  • The claim went to the plan where a delegated entity is responsible.
  • The contract excludes the service from fee-for-service payment.
  • The member is assigned to a group the practice does not contract with.

Is CO-256 worth appealing?

Sometimes worth appealing

Establish who holds the risk before appealing. Where a delegated group is responsible, the claim goes there; where the plan is wrong about delegation, that is what the appeal says.

How to resolve or appeal CO-256

  1. 1

    Ask who is delegated for this service

    The plan's provider services can identify the responsible entity.

  2. 2

    Redirect rather than appeal

    Where a group holds the risk, the claim belongs with them and the filing clock is running.

CO-256 — frequently asked

How do I know a member is capitated?
Rarely from the card. Eligibility responses sometimes name the delegated group, and provider services can confirm it — but it usually takes asking.
Does the filing clock keep running?
Yes, and misrouting does not stop it. Establishing the right entity quickly matters more than the appeal.

Related guides

CO-24 · Coordination of benefitsCO-160 · BenefitCO-96 · Benefit

Sources

Reason-code meanings are paraphrased from the X12 Claim Adjustment Reason Code list for plain-language reference; they are not reproduced verbatim. This is general information, not legal, coding, or medical advice — always confirm against the payer's remittance and policy.

Turn this CO-256 denial into a signed appeal

Upload the denied EOB and Merits builds a complete CO-256 appeal — the argument, the payer's own coverage criteria, and your federal appeal rights, every claim cited to a named source. $9 a letter. No account.

Appeal a denial →