N522N-series (general use)COB & Secondary
N522: Duplicate of a crossover claim
This claim duplicates one already processed (or being processed) as an automatic crossover from Medicare to the supplemental payer.
Commonly appears with these denial codes
The denial code gives the category; N522 pinpoints the specific problem. Read them together before touching the claim.
What to do about it
Don't rebill supplemental claims that cross over automatically — check the Medicare remit for crossover indicators (MA18) before submitting to secondaries.
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