Which medical insurance covers better ?

I am 35 and married with 2 boys aged 8 and 4. I am planning to include my parent senior citizen also. I am looking for best coverage and tax benefit. Which company offers best policy and coverage, tata, reliance, lic, sbi, etc. Some of them saying cashless benefit, but it is really not working i experienced with lombard 2 years back and discontinued. The hospitals wont agree into this, but i dont know what is the status now ? Looking for suggestions.