CO-243: Service lacked required network or PCP okay

The payer is telling you that the member's benefit requires a network provider or primary care provider to authorize the service, and that did not happen according to their records. In network-managed plans, this can mean the PCP did not approve the referral, or the contracted behavioral network never issued the referral or service authorization. Mechanically, the claim is hitting an authorization or referral edit tied to the member's product and to your NPI and taxonomy. The payer applies a contractual adjustment with CO-243 to all or part of the charge, which means the denied amount is not billable to the patient unless you overturn the decision through correction or appeal.

In behavioral health, CO-243 shows up often with HMO and narrow-network products where a medical PCP or a behavioral gatekeeper has to okay specialty care. Example: a PHP or IOP admit for a commercial HMO where the plan requires a PCP referral into outpatient psychiatry before higher levels of care, and that step never occurred in the system. You will also see CO-243 when a behavioral-health carve-out vendor manages the mental health benefit and expects specific network referrals before residential, detox, or OTP services. The facility might have a valid treatment authorization from the carve-out, but the health plan's core system does not see the required PCP or network referral link, so the per-diem UB-04 days deny. Telehealth can trigger this too. A patient may have a PCP-to-psychiatry referral on file for in-person visits only, but the payer's edit requires a separate referral or network approval for telehealth codes with modifier 95 or 93. Group therapy codes or family sessions can fail under CO-243 when the referral is tied only to individual psychotherapy or to a single clinician rather than the facility.

• Confirm the member's product type and whether a PCP referral or network gatekeeper approval is required for behavioral services.
• Check your records for any referral numbers, authorization IDs, or concurrent review approvals that may not have been placed on the claim.
• Contact the payer or behavioral carve-out to verify if a referral or PCP authorization exists in their system and confirm the correct number and date range.
• If a referral exists, submit a corrected claim with the referral or authorization indicator and reference number in the required fields.
• If no referral exists but the PCP or gatekeeper did direct care, obtain a retroactive referral in writing when the plan allows it, then appeal with supporting notes and PCP documentation.
• If the plan never covers services without prior network or PCP authorization and retro approval is not allowed, document the CO-243 as a contractual write-off and update any patient estimate or financial notes.

• At verification, confirm if the plan requires PCP or network referrals for each behavioral level of care, including PHP, IOP, residential, detox, and telehealth.
• Build intake checklists and EHR fields that capture PCP name, referral status, and required referral or authorization numbers before scheduling.
• Configure claim scrubber rules to flag behavioral claims lacking a required referral or gatekeeper authorization when the plan code indicates that requirement.
• Review high-volume HMO and carve-out contracts with your utilization review and intake teams so they know which services must flow through a PCP or network gatekeeper.