Final answer:
The two concepts used to determine if services provided under Medicare in hospital settings are appropriate as billed services are medical necessity and level of care.
Step-by-step explanation:
Medicare, the federally funded health insurance program in the United States, provides coverage for eligible individuals aged 65 and older, as well as certain younger individuals with disabilities or specific medical conditions. Medicare is organized into different parts, and each part covers specific services, including those provided in hospital settings.
The two concepts that are used to determine if services provided under Medicare in hospital settings are appropriate as billed services are medical necessity and level of care.