I'm extremely happy that wheelchair is one of our vocabulary words.
handikapita persono = handicapped person.
I guess other terms can also be constructed using words like malsame (differently) to make words like differently abled.
"I'm disabled." - https://www.youtube.com/watch?v=dDZzl9AyXeg
In case it helps, rulseĝo comes from ruli (to roll) and seĝo (chair), so literally it means "rolling chair", just like many other European words for wheelchair.
li ŝtelis mian rulseĝon!