Yes, you can make a “medical request.” Know that it isn’t guaranteed. If there is a bookable category that meets the request you would need to book that room category; for example a Preferred room at POP will get assigned a building “close to dining and transportation” - so making the request with a standard room reservation will not get a preferred room.
If it’s really important that the request be fulfilled, try to find a way to book what you need - either by booking category or maybe a different resort.
Enjoy your vacation!