Received EOB for a claim filed 4 years after listed service date stating I owe a balance to the medical associate. Do I legally have to pay it?

I (26F) received an EOB stating it is my responsibility to pay medical associates for durable medical equipment (in the amount of $3k) and that insurance covered $0. However – the claim was filed 05/2023 and lists the service date as 08/2019. I was still under my parents insurance at that time and so their insurance should have covered my ACL reconstruction (after calculating all the maximum out of pocket etc) – which is what I am assuming it is for. I was no longer covered at the time the claim was submitted but would have been covered at the time of service. My general question is do I have to pay it? Why did I receive it 4 years after the service date? Is there a legal timeframe the provider has to file a claim with insurance? I was looking at VA statues and it says that medical providers have 21 days to file a claim, and how I read it was that if they don’t I’m not responsible for it. I’m really confused on the whole thing.

https://law.lis.virginia.gov/vacode/title8.01/chapter3/section8.01-27.5/

https://law.lis.virginia.gov/admincode/title12/agency30/chapter95/section10/

submitted by /u/spices_and_spades
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