Which is the best health insurance policy available with less premium?

You can try any government insurance companies like New India Assurance Company, United India , Oriental and National Insurance.

The premiums will be cheaper but it will have high deductibles (which means you will have to pay some percentage of money for the treatment from your hand, like 50–50 or 75–25 like that).

But if you search you will surely get one or two cheaper.