Health / Auto Insurance subrogation

I live in Oklahoma and was at fault in an auto accident about 3 years ago. I was hospitalized and my health insurance covered the hospital bills (minus deductibles and coinsurance). My auto insurance company also sent me a check for my full amount of med pay coverage without asking any questions about my treatment, bills, or other coverage. Just yesterday, I received a letter from my health insurance company stating that I owe them any amount paid through settlement or award from another source and that they are aware of another amount paid.

Am I responsible for paying my health insurance company the amount my auto insurance company paid me? Can I at least substract the deductibles, coinsurance, and other (dental) bills I paid out of pocket?

Thanks