Am I liable for a bill that I never received notice about?

Question Details: I visited a hospital a while ago and when they were unable to run my insurance for a service they didn't notify me about. I talked to an individual from the hospital when I received a collections letter about the account to ask why. I was told that they sent a few statements to an old address. I left a forwarding address when I moved to prevent such a thing from happening and when I called the apartment complex they said they had that address on file. I paid off a bill from the hospital for the visit so I thought I was all good with them legally. I contacted my insurance to see if they would take it on and they said it was never filed to them the hospital said they were unable to find me even though I was covered under my fathers plan at the time. Do I have a case since I never received any notification of an error with my insurance of any statements detailing the issue?

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