Reference: ad-Durar an-Naadhirah fil-Fataawa al-Mu’aasirah – Page 434
Question: Is Hajj obligatory upon the disabled (incapacitated) or not?
Response: Whoever is able to perform the hajj with his wealth, but is unable to physically undertake the hajj due to a persistent [physically] prohibiting factor, then he is required to appoint someone to perform the obligatory hajj on his behalf – with the condition that the appointee has already performed hajj for himself.
حج المعاق
المرجع: الدرر الناضرة في الفتاوى المعاصرة – ص434
السؤال: هل يجب الحج على المعاقين و المعاقات أم لا؟
الجواب: من قدر على الحج بماله و لم يقدر على مباشرته ببدنه لمانع مستمر فإنه يجب عليه أن ينيب من يحج عنه حجة الإسلام بشرط أن يكون النائب قد حج عن نفسه.