Is it normal for healthcare providers (clinics, hospitals, etc) to claim the treatment fee of a patient to the insurance company two months after the treatment?

I have a case where the clinic I visited for treatment in early January this year contacted me demanding an out-of-pocket payment because their claim to my insurance that I used for registering in the clinic was rejected. The reason of the rejection of the claim is most likely because I am no longer a policyholder of that insurance. I was working at a university and that insurance was the university insurance, you can enroll in this insurance only if you are affiliated with the university. Now I have moved out of my previous university (in early February). I am annoyed by the fact that the clinic I visited didn't make the claim shortly after my treatment. Who the heck would have expected that one still has an unpaid medical bill a month after the said treatment? Is this practice of delaying the claim this long normal among US healthcare providers? And before anyone presumes that it is a small clinic, no they are not, they are a big healthcare provider in my city.

submitted by /u/whatisa_sky
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