Are adult children responsible for paying deceased parents medical bills?

Answer

Your parents would have had a Will and the Estate (your parent's home, all monies they have, etc.) are Probated before anything in that Will is released to the Heirs. Probate makes sure all personal/property taxes are paid, all creditors are paid off and what is left in the Estate is called the "residue" and then it's divided amongst the Heirs in the Will according to the deceased instructions. No, you are not responsible for the medical bills in this case. Probate will take care of this.

If your parents left no Will, then the courts will pay off all creditors.

Heirs are not responsible for paying off creditors, but, if you want to collect from the Will, then you are going to have to wait for Probate which could be 8 months to a year.