In case of Individual, if a person pay premium say Rs.5000/- for Mediclaim for the period 30/3/2011 to 29/03/2012 on 25th March, 2011. He is eligible for deduction for section 80D in year 2011-12. He has not claim that amount in the year 2010-11. So my point is that he can claim deduction in this section for the current year or not.