OA-16: Missing Information or Billing Error

What Does OA-16 Mean?

OA-16 indicates that required information is missing but responsibility is not clearly assigned to the provider or patient. This most commonly appears on secondary claims when primary payer remittance data is missing or incomplete. The OA Group Code means this is an informational adjustment that requires case-by-case review.

CARC 16 is one of the most frequently encountered denial codes in medical billing. It fires when the payer's adjudication system determines that the claim lacks information needed to process it, or that submitted data contains errors preventing proper adjudication. The code is intentionally broad — the accompanying RARC code is what tells you the specific problem.

The financial impact of CARC 16 depends entirely on the Group Code. When filed as CO-16, the provider bears the cost and must correct and resubmit. When filed as PR-16, the patient is financially responsible — typically because they failed to provide necessary information like current insurance details or a required referral. OA-16 appears most often on secondary claims where primary payer remittance data is missing.

Despite being common, CARC 16 denials are among the most preventable. Most stem from data entry errors, missing fields, or outdated patient information — all issues that front-end verification and claim scrubbing can catch before submission.

Common Causes

How to Resolve

Resolution depends on the Group Code: CO requires correction and resubmission, PR may require patient contact or billing, and OA typically needs additional documentation.

1. Review the RARC code Identify the specific missing information — most often primary payer remittance or coordination of benefits data.
2. Gather missing documentation For secondary claims, obtain the primary payer's EOB or remittance advice. For COB issues, verify the coordination of benefits data.
3. Resubmit with attachments Resubmit the claim with the required supporting documentation attached.
4. Contact payer if unclear If the RARC doesn't clearly indicate what's needed, call the payer's provider services line for guidance.

Common RARC Pairings

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

How to Prevent OA-16

• Always attach primary payer EOB when filing secondary claims
• Verify coordination of benefits data is current before filing
• Use automated COB workflows to ensure required documentation is included

General Prevention

• 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