Medicare Options The Difference in Medicare A and B Does Your Medicare Plan Cover B12 Shots? Understanding Medicare drug coverage is essential. Here's a brief overview: Part A covers medications during hospital stays or skilled nursing facilities. Part B includes drugs supplied by your healthcare provider or at B 12 (Methylcobalamin) Therapy MedClub by Dr Jenn Vitamin B12 Medicare Coverage and Co Pay Details GoodRx Cyanocobalamin Medicare Coverage and Co Pay Details GoodRx