being in medical field it would be worthwhile to note following points.
You have to go with a larger player, as now awareness is increasing so is the claims for reimbursement.
I have had nice experience from Government players, I have my general insurance need are covered completely by New India Assurance.
All 4 companies in govt sector have same offers.
Other options are Iffco-Tokio / Bajaj and HDFC those are good reputed ones.
Dont fall for Reliance.
Whenever you go fro mediclaim make sure you take your policy in individual allocation amount (means if you are taking insurance for your specified family members do fix up every ones amount for insurance), in other words dont go for floater policies.
And make sure you take a reasonable amount bare minimum imho would be 2.5 lacs for a person who is earning and has other members earning too.
If the person in sole breadwinner then take it to 4-5 lacs.