I have recently had some health problems and have had 2 separate surgeries and used a week of vacation time for each to recover. I now have to go in hospital for a procedure and need another day off. It can only be done during the work week. Does my

I have recently had some health problems and have had 2 separate surgeries and used a week of vacation time for each to recover. I now have to go in hospital for a procedure and need another day off. It can only be done during the work week. Does my supervisor have the right to deny my request to use a vacation day for this?