CARC 6 Active

OA-6: Procedure/Revenue Code Inconsistent with Patient Age

TL;DR

Adjustment in a COB or secondary payer context. Review the coordination of benefits details to determine the responsible party.

Action
Verify & Resubmit
Who Pays
Depends
Appeal
Yes
Patient Impact
Indirect
Disclaimer
This content is for informational purposes only and does not constitute professional billing advice. Always verify information against your payer contracts and current coding guidelines. Consult a certified billing specialist for specific claim issues.

What Does OA-6 Mean?

With OA (Other Adjustments), CARC 6 typically appears in a coordination of benefits (COB) context. Age inconsistency detected during secondary payer processing. The financial responsibility depends on the specific arrangement between payers — review the primary payer's EOB and the COB terms to determine the correct course of action.

CARC 6 appears on a remittance when the payer identifies an issue related to procedure/revenue code inconsistent with patient age. 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: patient's date of birth is entered incorrectly in the system, causing age calculation errors; Procedure code has age limits that do not match the patient's actual age (e.g., pediatric code for adult patient); Coder selected a CPT code with age restrictions when an age-appropriate alternative exists. The group code paired with CARC 6 determines who bears the financial responsibility — CO places it on the provider as a contractual obligation, OA indicates a coordination of benefits or other payer adjustment, PR shifts it to the patient.

Common Causes

Cause Frequency
Secondary payer age validation Age inconsistency detected during secondary payer processing Most Common

How to Resolve

  1. Review the coordination of benefits Examine the OA-6 adjustment to understand how it fits within the primary/secondary payer relationship or other multi-payer context.
  2. Verify primary payer adjudication Review the primary payer's EOB to understand the basis for the secondary payer's OA adjustment.
  3. Determine the responsible party Based on the COB review, identify whether the adjustment should be absorbed, billed to another payer, or if additional documentation is needed.
  4. Appeal or resubmit if needed Appeal with DOB verification and clinical documentation if the age-procedure combination is valid.
  5. Follow up Monitor the claim status and take additional action as needed based on the COB determination.
Appeal Guide

Appeal with DOB verification and clinical documentation if the age-procedure combination is valid.

Common RARC Pairings

The RARC code tells you exactly what triggered the OA-6:

RARC Description
MA130 Missing/incomplete/invalid information can be resubmitted Correct and resubmit to secondary payer →

How to Prevent OA-6

Also Filed As

The same CARC 6 may appear with different Group Codes:

CO-6 PR-6

Related Denial Codes

OA-4 — Procedure Code Inconsistent with Modifier OA-5 — Procedure Code Inconsistent with Place of Service OA-7 — Procedure/Revenue Code Inconsistent with Patient Gender OA-8 — Procedure Code Inconsistent with Provider Type/Specialty OA-9 — Diagnosis Inconsistent with Patient Age

Sources

  1. https://x12.org/codes/claim-adjustment-reason-codes
  2. https://revenuecyclemgmt.com/claim-adjustment-reason-codes/
  3. https://www.rivethealth.com/blog/carcs-rarcs-claim-adjustment-remittance-advice-codes
  4. Codes maintained by X12. Visit x12.org for official definitions.