What type of services are covered under Medicare's outpatient hospital services?

Medicare's outpatient hospital services specifically cover a range of medical services that do not require an overnight stay in the hospital. This includes emergency room care, where patients can receive treatment for urgent medical issues without being admitted, as well as services provided in outpatient clinics. Outpatient clinics offer various treatments and procedures that can be done during a single visit, allowing patients to receive care and go home the same day.

The other options do not align with the definition of outpatient services. Surgical procedures that require admission to a hospital are typically categorized as inpatient services, meaning they do not fall under the outpatient category. Similarly, inpatient overnight stays are not considered outpatient services, as they involve patient admission and require hospitalization. Finally, nursing services alone do not define outpatient hospital services unless they are part of a broader treatment plan administered during an outpatient visit. This comprehensive coverage of emergency and outpatient clinic services is what makes the selected answer accurate.