2 claims for the same visit

20F, completely lost right now. So I have Medicaid through my parents plan and have been using it at the same provider for years without ever seeing a bill (I assume it’s full coverage, I owe $0). When I started college, I was given a grant from my university to purchase insurance from Anthem, so I had 2 plans. I thought I never used this plan, as I still only ever went to the same provider (Medi-Cal). So you could imagine my surprise when I got an Anthem claim in the mail today saying I need to pay $60. I graduated and don’t even have the plan anymore, but it’s for a specific visit in February 2022. I’ve been to the hospital many times since and didn’t receive anything from Anthem for those.

So for that visit, my claim under Medicaid (online) is completed and I owe $0. My claim under Anthem (online) is denied for being out-of-network, but it also says I pay $0. My claim under Anthem (mail) says I need to pay $60. The customer service is not helpful. I’m assuming that the provider billed both of my insurances for this visit, and Medicaid covered it while anthem did not. But since it’s covered, I don’t owe Anthem $60 right? Thanks for any guidance, my parents are even more clueless!