CO-5: Procedure Code Inconsistent with Place of Service

What Does CO-5 Mean?

With CO (Contractual Obligation), the CARC 5 adjustment is the provider's responsibility. The payer denied or reduced payment because of wrong POS code entered on the claim form that does not match where the service was rendered. The patient is not liable for this amount. If the denial is in error, the provider can correct and resubmit the claim or file an appeal with supporting documentation.

CARC 5 appears on a remittance when the payer identifies an issue related to procedure code inconsistent with place of service. This is a technical billing or coding problem that must be corrected before the claim can be processed for payment. The denial indicates the claim data did not meet the payer's adjudication requirements.

Common scenarios that trigger this adjustment include: wrong POS code entered on the claim form that does not match where the service was rendered; Billing POS 11 (office) for a procedure performed in a facility setting like ASC (POS 24) or hospital outpatient (POS 22); Using incorrect POS code for telehealth services (should use POS 02 or 10). The group code paired with CARC 5 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 remittance details Examine the CO-5 adjustment and any accompanying RARC codes to identify the specific reason for the denial.
2. Identify the root cause Determine which issue applies: incorrect place of service code, facility vs non-facility POS mismatch, telehealth POS error, among others.
3. Correct the claim Address the identified issue — update the claim data in your billing system to resolve the procedure code inconsistent with place of service problem.
4. Resubmit the corrected claim Submit the corrected claim following the payer's resubmission guidelines. Include any supporting documentation that addresses the denial reason.
5. Appeal if the original claim was correct If the POS code was correct, appeal with documentation proving the service was rendered at the billed location, including facility records and encounter notes. Resubmission with correction is typically faster.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-5:

How to Prevent CO-5

• Double-check POS codes before claim submission
• Train billing staff on current POS code guidelines
• Implement pre-submission claim scrubbing to catch POS mismatches
• Configure billing software defaults correctly for each service location
• Conduct regular audits of POS coding patterns

Also Filed As

The same CARC 5 may appear with different Group Codes:

Related Denial Codes