Medicare Part B is a part of the Medicare program in the United States. It covers medical services and supplies deemed medically necessary to treat a health condition.

Medicare Part B is one of the required components to qualify for either Original Medicare (and optional add-ons) or Medicare Advantage. In the majority of cases, Part B has a monthly premium due, paid by the beneficiary...In 2023, the standard Part B premium is $164.90 per month, and the premium can increase for higher-income individuals.

Part B covers a wide range of services, including the list below:

-Doctor's services
-Outpatient care
-Home health services
-Durable medical equipment
-Some preventive services
-Mental health services
-Limited ambulance services
-Clinical research
-Limited outpatient prescription drugs

Part B is technically optional but is utilized in the vast majority of cases and requires the payment of a monthly premium by the beneficiary. It also requires a deductible and coinsurance - a percentage of the cost of covered services that the beneficiary must pay.

It is important to note that Medicare Part B does not cover all medical services and supplies. There are some limitations and exclusions, and some services may require prior authorization.

Overall, Medicare Part B is a crucial component of the Medicare program that helps cover the cost of necessary medical services and supplies for those enroll.