OK. My Doctor Prescribe Me Tetosterone Gel Pads ( One/day).

OK. My Doctor prescribe me Tetosterone gel pads ( one/day). When I went to the pharmacy I f ound out that the price is too expensive ( more than $ 600.) Then I asked his help to find something with a lower price.HIs answer was to suggest me to call my Insurance Company to see which tetosterone Gel medication might be covered and let him know.
My insurances are Medicare ( Part D ) & GHI
Can you help me ...?