Ensure that all health declaration of your father pre existing diseases are made .
All insurance companies eould accept your proposal if your father has only history of diabetes and bp . They would give a waiting period of 2 to 3 year which is a right step or may offer a 20 % co pay .
So go ahead and insure your father. You are a great son .
Health insurance is the best gift which you can offer to parents .
Check the list of insurers who are in list of your hospital . Cashless is applicabld when hospital is in nrtwork hospital .