In order to itemize the medical expenses, the medical expenses must exceed 7.5% of you AGI. If the medical expenses do not exceed 7.5%, the medical expenses can't be deducted.
However, paying for the medical expenses will count towards how much support you provide for your father. If you can show you pay more than half his living expenses as detailed by, Vanessa A, then you can claim your father as a dependent. To determine this, you will need to calculate all living expenses paid for by you and what is paid by him and see if you pay over half.
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