What is coordination of benefits in medical billing?

Coordination of benefits, or COB, is the process that determines which insurance plan pays first when a patient has more than one policy. Getting the payer order wrong is one of the top reasons secondary claims stall.

Why do secondary payer claims take longer to process than primary claims?

Secondary claims need the primary payer’s explanation of benefits attached before submission. Any delay, error, or mismatch in that data adds a full extra review cycle on top of the primary claim’s own processing time.

What is the birthday rule in coordination of benefits?

The birthday rule sets the primary plan for a dependent covered by both parents. The parent whose birthday falls earlier in the calendar year, month and day only, holds the primary plan.

Is Medicare always the primary payer?

No. Medicare is secondary when a patient is still working and covered by an employer plan from a company with 20 or more employees, or in certain workers compensation and liability cases.

What happens when a claim is submitted to the wrong payer as primary?

The payer that receives the claim as primary, but is actually secondary, denies it or returns it for correction. The practice then has to identify the correct primary payer and resubmit, which adds days or weeks to resolution.

How does an outdated COB record cause claim delays?

Payers only know about a patient’s other coverage if that information is current in their system. A patient who changed jobs or added a spouse’s plan without updating COB data will trigger denials until the payer’s records catch up.

What is a Medicare Secondary Payer questionnaire?

It is a set of questions Medicare requires providers to ask at registration to confirm whether another payer should be billed first. Skipping it or recording it inaccurately is a common source of COB denials.

Can a secondary claim be denied even if the primary claim was paid correctly?

Yes. A secondary payer can deny a claim over COB data alone, even when the primary payer processed and paid its portion without any issue.

What information does a secondary payer need that a primary payer does not?

Secondary payers need the primary payer’s explanation of benefits, including allowed amount, paid amount, and adjustment codes, attached to the claim before they will process it.

How often should a practice re-verify COB information?

COB status should be checked at every visit, not just annually, because employment changes, plan enrollment, and dependent coverage can shift at any point in the year.

Coordination of benefits errors: why secondary payer claims take 3x longer to resolve

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