Final answer:
Anyone receiving Social Security benefits is automatically covered under both Medicare Part A and Medicare Part B, with the option to decline Part B due to its premium. There is no automatic enrollment in Medicare Part D unless the individual chooses to enroll.
Step-by-step explanation:
The question pertains to the coverage under Medicare for individuals receiving Social Security benefits. Medicare has two primary parts, Part A and Part B. Medicare Part A is hospital insurance that pays for inpatient hospital care and certain follow-up services. Medicare Part B is medical insurance that pays for doctors' services, outpatient hospital care, and other medical services that Part A doesn't cover. People who receive Social Security benefits are automatically enrolled in Medicare Part A once they are eligible. However, while enrollment in Medicare Part B is also automatic, individuals have the option to decline it since it includes a premium. There is no automatic coverage for Medicare Part D, which is the Prescription Drug Plan, unless the individual actively enrolls in it. Therefore, anyone receiving Social Security is automatically covered under Medicare Part A and Medicare Part B. This coverage is part of the social insurance program designed to provide health care benefits to the elderly and other eligible individuals.