OA-22: Care Covered by Another Payer (COB)

What Does OA-22 Mean?

OA-22 is less common and appears when the payer classifies the COB adjustment as an administrative matter rather than a contractual obligation. This can occur in situations where the COB order is ambiguous, multiple payers are coordinating, or the payer needs additional information to determine their position in the payment sequence. The OA designation does not assign the amount to the provider's contractual write-off or the patient's responsibility — it is held pending resolution of the COB question.

When CARC 22 appears on a remittance, the payer is telling you that they believe another insurance carrier should process this claim first under coordination of benefits (COB) rules. The payer is not saying the service is not covered — they are saying they are the wrong payer to be billed at this point in the sequence. Until the correct primary payer adjudicates the claim, the secondary (or tertiary) payer will not process it.

This is one of the most common COB-related denials in medical billing and arises from the complexity of patients holding multiple active insurance policies. The typical triggers include submitting to the secondary payer before the primary processes the claim, outdated COB information in the payer's records (the patient acquired new primary coverage but the secondary was not updated), or Medicare Secondary Payer situations where employer-sponsored insurance should be billed first. The RARC MA04 frequently accompanies CARC 22, explicitly stating that secondary payment cannot be considered without primary payer payment information.

COB-related denials account for an estimated 15 to 20 percent of all claim denials industry-wide, and each reworked claim carries a cost of $25 to $50 in staff time and administrative overhead. The resolution is procedural rather than clinical: determine the correct COB order, submit to the primary payer, wait for their adjudication, and then forward the claim to the secondary payer with the primary's EOB. Preventing these denials requires consistent insurance verification workflows that capture all active policies — not just the card the patient presents — at every visit.

How to Resolve

Determine the correct primary/secondary payer order, submit to the primary payer first, then bill the secondary payer with the primary's EOB.

1. Review the ERA for COB-specific information requests Check for RARCs that specify what COB information the payer needs — often MA04 requesting primary payer identity or payment information.
2. Verify and provide COB information Confirm the patient's complete insurance coverage, determine the correct payer order, and provide the payer with the requested COB documentation.
3. Submit to the correct primary payer if needed If you have not yet billed the primary, submit there first. Once adjudicated, provide the primary's EOB to the secondary payer.

How to Prevent OA-22

• Collect all insurance policy information including policy numbers and group numbers for every active plan during patient registration
• Verify COB order with all involved payers before initial claim submission
• Flag patients with multiple insurance policies in your scheduling system for proactive COB verification at every visit

Also Filed As

The same CARC 22 may appear with different Group Codes:

Related Denial Codes