It's been a few years, but when my father's health was declining I was able to get someone in a golf cart to come pick us up at our tailgate in the Blue Lot and get him up to the stadium.
Edited to add:
Found this on the official website...
HANDICAP ACCESS/COURTESY SHUTTLES
Golf Cart shuttles are available to assist handicap, elderly or injured patrons. Please request one from a parking lot attendant in the Blue, Gold, Green, Orange, Red or McCreary Tower Lots. There is a continuous handicap shuttle service provided for anyone parked at the David F. Couch Ballpark. You may also call 336-758-GAME (4263) to request a shuttle. Golf Carts will not cross the street. Volunteers are available at Gates 1, 3, and 5 to help push patrons to their seats.