Notwithstanding any other provision of law to the contrary, in determining eligibility for retroactive and prospective medical assistance, only medical expenses incurred on or after the first day of the third month before the month of application may be deducted from countable income, provided that the expenses were not previously deducted in determining eligibility for medical assistance and are not subject to payment by another party, including medical assistance.
62 P.S. § 441.3