Medicare Part B excess charges are the difference between the amounts Medicare-approved items and the higher amounts physicians or other health care providers can legally charge under original Medicare, states Medicare. Medicare Part B covers preventive and medically necessary services and supplies, as of June 2015.
Services such as doctor visits, lab tests and surgeries, and supplies such as walkers and wheelchairs are items that Medicare considers as medically necessary to treat a disease or condition. Medicare beneficiaries do not pay anything for most preventive services, such as flu shots, when the provider accepts assignment, notes Medicare. To avoid excess charges, patients should discuss with their physician or health care provider whether they need particular supplies or services, whether Medicare covers them, and whether the provider accepts assignment.