Marshall Plan for Coal Country Act of 2020 This bill addresses provisions related to coal mining and coal communities, including by (1) providing Medicare benefits for individuals who lost their job (other than a discharge for cause, voluntary departure, or retirement) at a coal mine or coal power plant; and (2) expanding and revising the Abandoned Mine Reclamation Fund to provide support for economic revitalization, diversification, and development in economically distressed mining communities through the reclamation and restoration of land and water resources adversely affected by coal mining carried out before August 3, 1977.