Which of the following services is NOT covered under Medicare Part B as an outpatient service?

The assertion that most immunizations are not covered under Medicare Part B as an outpatient service is accurate because Medicare Part B does have specific guidelines on vaccines. While it does cover certain vaccinations, such as those for influenza and pneumococcal diseases, other immunizations, particularly those for travel or routine immunizations, are typically not included.

In contrast, services such as physical therapy, emergency room services, and artificial limbs are indeed covered by Medicare Part B, assuming they meet clinical necessity and other coverage requirements.

The distinction is significant in understanding the breadth of Medicare Part B coverage as it pertains to outpatient services. It's important for beneficiaries to be aware of what is included under this part to make informed healthcare decisions and avoid unexpected costs.