OA-16: Missing Information or Billing Error

What Does OA-16 Mean?

With OA (Other Adjustments), CARC 16 typically appears in a coordination of benefits (COB) context. Secondary claim submitted without the primary payer's EOB or remittance data, so the secondary payer cannot adjudicate. 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 16 is used when the payer determines that missing information or billing error. The claim could not be processed as submitted because required information was absent, incomplete, or did not meet the payer's submission standards.

Common scenarios that trigger this adjustment include: incorrect date of birth, misspelled name, wrong member ID, or gender mismatch between the claim and the payer's enrollment file; Inactive NPI, missing PECOS enrollment, wrong taxonomy code, or ordering/referring provider not on file with the payer; Service required prior authorization but the auth number was not included on the claim, or the authorization expired before the date of service. The group code paired with CARC 16 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 coordination of benefits Examine the OA-16 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. Follow up Monitor the claim status and take additional action as needed based on the COB determination.

Common RARC Pairings

The RARC code tells you exactly what triggered the OA-16:

How to Prevent OA-16

• Attach the primary payer's EOB when submitting secondary claims to prevent missing remittance information
• Verify coordination of benefits data is current and accurate before filing secondary claims
• Use electronic attachments and automated COB workflows to ensure all required supporting documentation is included

Also Filed As

The same CARC 16 may appear with different Group Codes:

Related Denial Codes