Hi, only OPD plans, are not available in health Insurance.

You can check out

ICICI Health Shield

Niva Bupa Reassure

As an ass on rider

There are plans which provide OPD covers. However, the OPD coverage amount is dismal and capped. E.g. paying around 350 Rs per OPD and max upto a few thousands for the year. We find it not so great and not worth paying higher premiums.