CO-122: Psychiatric Services Reduction

What Does CO-122 Mean?

With CO (Contractual Obligation), the CARC 122 adjustment for psychiatric services reduction is a contractual reduction. The provider absorbs this amount per the payer contract or regulatory payment methodology. The patient is not responsible for the adjusted amount. Review the remittance to confirm the adjustment is consistent with your contract terms.

CARC 122 means the payer adjusted the payment based on psychiatric services reduction. The reimbursement was calculated using the payer's fee schedule, contracted rate, or regulatory payment methodology rather than the billed charge.

Common scenarios that trigger this adjustment include: the plan applies a reduction or limitation on outpatient mental health services that differs from medical/surgical benefits, resulting in lower reimbursement; Historically, Medicare applied a reduction to outpatient psychiatric services (the outpatient mental health treatment limitation). While largely eliminated by the MHPAEA, some legacy adjustments may still appear; The payer applies different cost-sharing or coverage limits for mental health services compared to medical/surgical services, which may violate mental health parity requirements. The group code paired with CARC 122 determines who bears the financial responsibility — CO places it on the provider as a contractual obligation, PR shifts it to the patient, OA indicates a coordination of benefits or other payer adjustment.

Common Causes

How to Resolve

1. Review the adjustment against contract terms Compare the CO-122 adjustment with your payer contract to confirm the reduction is consistent with agreed terms or regulatory methodology.
2. Verify the adjustment amount Confirm the dollar amount of the adjustment is calculated correctly based on the contracted rate and the service provided.
3. Appeal if the adjustment is incorrect Appeal if the mental health benefit reduction violates MHPAEA parity requirements. Include documentation comparing the plan's mental health cost-sharing and limitations against its medical/surgical benefits. Reference MHPAEA compliance requirements and provide clinical documentation supporting the services.
4. Process the contractual adjustment If the adjustment is correct per contract terms, process it accordingly in your billing system. This amount cannot be transferred to the patient.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-122:

How to Prevent CO-122

• Review payer contracts for mental health benefit limitations and parity compliance
• Use correct CPT codes for psychiatric services to ensure proper adjudication
• Monitor mental health visit counts per patient to avoid exceeding plan limits
• Stay informed about mental health parity law updates and their impact on reimbursement
• Document the medical necessity of psychiatric services to support coverage in case of dispute

Also Filed As

The same CARC 122 may appear with different Group Codes:

Related Denial Codes