TCS Health Insurance Scheme doubt

sorry for posting in Thane community since idk anyother way to clear my doubt. I joined TCS in thane 5 months ago, and added my parents in beneficiary details in the TCS HIS scheme. In my last month salary, there was about ₹7000 deduction in my salary, checked the payslip and it was in the name of "health insurance scheme premium". I wanna know for how many months in a year will they deduct this? it's hard to manage for me with such big deduction.. I read all policy and everything but I couldn't find any answer for my question.