Which of the following statements about Medicare Part B is true?

Medicare Part B is designed to provide coverage primarily for outpatient care, which includes a wide range of services such as doctor visits, preventive care, outpatient hospital services, some home health care, and certain medical equipment. This makes it an integral part of comprehensive healthcare coverage for Medicare beneficiaries. Beneficiaries can access necessary medical services without being admitted to a hospital, which reflects Part B's focus on outpatient care.

The other statements do not accurately describe Medicare Part B. For instance, the assertion that Part B covers only emergency services is misleading, as it encompasses various outpatient services beyond emergencies. Additionally, while there is a monthly premium for Part B, the claim that it does not have a premium is incorrect. Finally, although Part B is often recommended for all beneficiaries due to its extensive coverage, it is optional for those who wish to forego it, but opting out could lead to penalties if one decides to enroll later.