Hi @caretakermom 😊
I have not had any issues with billing since my transplant, but I have had billing issues in the past from my local hospital.
At that time, when I called my insurance company the very helpful customer service representative explained it was a diagnostic code problem that was causing the rejection of the claim. She kindly told me the correct code, and then I called the hospital billing department and told them the code to use and re-send. All was well.
Did you speak with your insurance company to see what's up? Do you think it may be something like that?