Prior to the law’s implementation, Medicare beneficiaries were required to pay 50 percent of the cost of outpatient mental health treatment, while Medicare Part B covered 80% of other outpatient services. While Medigap plans could cover Part B cost sharing, not everyone is able to afford Medigap. MIPAA aligned Part B’s coinsurance for mental health care with other types of visits starting in 2014, after a phase-in period that began in 2010.