Help me to purchase a health policy

I want to purchase a health policy for my parents. My dad is 62 years old and my mom is 55 years old. Which policy would be best?

Need good network of hospitals, Minimum coverage needed is 10Lakh per head. No claim bonus of 5L per year. Need a policy that has good service and claim settlement.

My dad: smoker, drinker, no diseases My mom: have diabetes, thyroid