How can I get Tax benifit in medical reimbursement for Thalassemia Major?

I am Govt employee in Gujarat-India and my son is suffuring from Thalassemia Major. I have about 10000/- to 15000/- monthly expense for his medical treatment. My Company is recovering IT on my reimbursement above 40000/-. Thalassemia is one type of blood disorder and there is no cure treatment. Pl guide me what should I have to do to get tax benifits.