42 C.F.R. § 410.57
Preventive vaccines
(a) Medicare Part B pays for the pneumococcal vaccine and its administration.
(b) Medicare Part B pays for the influenza virus vaccine and its administration.
(c) Medicare Part B pays for the COVID-19 vaccine (or monoclonal antibodies used for pre-exposure prophylaxis of COVID-19) and its administration.
(d) Medicare Part B pays for the Hepatitis B vaccine and its administration, as defined in § 410.63(a).