80-d health insurance

You can claim an amount upto Rs. 25000, for self ,spouse and children.
A separate deduction will be available if paid for parents.

However for Fy 2018-19 onwards you must pay health insurance separate for you and your spouse bank account, through which you can claim deduction in both individual assessee account.

you can claim only 25000

Deduction to the extent of Rs. 25000 is allowed.