Wiki Secondary Medicaid insurance didn't cover Medicare's coinsurance amount

Biller2023

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Trenton, NJ
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Medicare applied an amount towards coinsurance but the secondary Aetna Better Health of NJ didn't cover the coinsurance stating Medicare paid more than Aetna Better Health's allowed amount for the CPT.
This is processed based on method 10 (this method pays lesser of the 2 health plans allowed amounts subtracting the COB paid).
Can someone, please explain what this is? Can we bill the patient for the coinsurance balance since the secondary didn't cover.
 
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