Which of the following services is covered by Original Medicare if criteria are met?

Ambulance services are covered by Original Medicare when specific criteria are met. To receive coverage for ambulance services, it must be deemed medically necessary, meaning that transport is required to get the patient to a hospital, critical care facility, or skilled nursing facility, and that it is not reasonable to use other forms of transportation due to the patient's medical condition.

In contrast, optometry services generally pertain to vision care and are not covered, except in certain situations like medical diseases of the eye. Physical therapy is typically covered, but it is not limited to just that service alone; it must meet necessary conditions regarding the patient's treatment needs. Chiropractic services have limited coverage under Original Medicare, primarily focusing on spinal manipulation, without covering other services typically associated with chiropractic care.