Duplicate Crossover Claim

Duplicate of a claim processed, or to be processed, as a crossover claim. The payer received a direct submission while the same claim is already in the crossover pipeline from the primary plan.

What This Means in Behavioral Health

N522 appears with CO-18 on BH claims when Medicare or a primary commercial plan automatically forwards (crosses over) the claim to Medicaid or secondary coverage—and the facility also submits directly to the secondary payer. Dual-eligible RTC and PHP patients are a frequent source of N522 when billing teams do not wait for crossover ERA before filing secondary claims.

Root Causes

• Secondary claim filed manually while primary crossover claim is pending
• Medicare crossover to Medicaid in process; provider also billed Medicaid directly
• Primary ERA not posted before secondary institutional per diem batch
• Billing vendor unaware crossover was triggered on primary adjudication
• Resubmission to secondary after primary paid without checking crossover status

How to Appeal

Do not resubmit a new claim when N522 indicates crossover duplicate—verify crossover status with the secondary payer first. If crossover never occurred despite the remark, appeal with primary ERA showing crossover indicator and proof secondary did not receive the claim. If the duplicate is valid, reconcile against the original paid or pending crossover claim.

Prevention Tips

• Hold secondary BH institutional billing until primary ERA posts and crossover status is confirmed
• Track Medicare-Medicaid dual-eligible patients separately in census billing workflows
• Call secondary payer to confirm crossover receipt before direct resubmit
• Document crossover claim control numbers on secondary work queues