It would actually be helpful if you knew the subject before putting pen to paper. You do a disservice to readers on this forum by giving wrong advice. (If I did not know better, I would lose money by following your incorrect advice.)
For your info, deduction can be claimed under Sec 80D for actual medical expenses incurred - if one does not have medical insurance. (Please check the IT rules on the subject of admissibility of Sec 80D deductions if you do not believe me.)
As for applicability of Sec 80D to the HUF, it remains unanswered. Better if this was answered by someone who really knows the subject matter at hand.