CO-256: Not payable under managed care contract

The payer is telling you the service, code, or scenario is not payable under the managed care agreement you billed under. In other words, the contract itself says they do not owe for this line, or they owe zero in the way you billed it. Mechanically, the payer matches the billed plan and provider against the managed care contract terms, covered services list, and benefit carve outs. If the code, modifier, place of service, or level of care is listed as non covered under that contract, the payer assigns CO-256 and sets the allowed amount to zero as a contractual adjustment.

In behavioral health this often hits when a managed behavioral health organization has a very narrow covered list for certain levels of care. For example, a PHP day billed with a revenue code or HCPCS the MCO does not list for that plan, even though the state Medicaid fee schedule shows the code in general. The general program may cover PHP, but the specific managed care plan the member is enrolled in does not cover PHP at your facility type. You also see CO-256 on telehealth behavioral visits when the MCO's telehealth policy for that specific product does not include behavioral codes like 90853 group or certain IOP per diems. The same provider may be paid for in person 90853, while 90853 with modifier 95 comes back CO-256 because the contract only covers telehealth for psychiatry, not therapy groups. Another behavioral pattern is MAT and OTP billing. Some managed Medicaid plans carve methadone and OTP services out to a separate behavioral vendor. If you bill the medical MCO instead of the behavioral carve out, they deny with CO-256 because under that managed care contract OTP is not a covered service at all.

• Confirm the member's exact plan and product type, and verify if behavioral health is carved out to a separate payer.
• Pull the managed care contract and fee schedule or coverage list for your facility type and check if the billed code, modifier, and level of care are listed as covered.
• If you used a code, modifier, or revenue code that is not on the contract crosswalk, recode to a covered equivalent that accurately reflects the service and rebill as a corrected claim.
• If the claim went to the wrong payer or benefit line, correct the payer selection, attach the original denial, and submit a new claim to the correct managed behavioral health or medical plan.
• If the service truly should be covered under the contract language, submit an appeal with contract excerpts, authorization proof, and clinical notes that show the service meets the contracted benefit definition.
• If the denial is contractually correct and there is no billing error, adjust off the CO-256 amount in your system and update any patient estimate that assumed coverage.

• At intake, verify not only eligibility but also whether behavioral health and SUD services are covered under the member's specific managed care product and which entity holds the behavioral benefit.
• Maintain a payer specific code and revenue code crosswalk for IOP, PHP, residential, detox, MAT, and telehealth so staff only use codes listed as covered under each contract.
• Build front end edits in your billing system to flag claims where a code level of care, modifier, or place of service is not allowed for that payer's managed care contract.
• Review new and renewed managed care contracts with clinical and billing leaders so service offerings align with covered levels of care and telehealth rules before patients start.