Final answer:
A Medicare-certified SNF is not required to provide 24-hour skilled nursing care, but it must adhere to other regulations such as developing care plans, complying with regulations, and maintaining a safe environment for residents.
Step-by-step explanation:
A Medicare-certified Skilled Nursing Facility (SNF) is required to adhere to all of the given requirements except for Providing 24-hour skilled nursing care. While SNFs are required to provide skilled nursing care, not all facilities may offer 24-hour coverage. Some SNFs may have limited nursing coverage during certain hours, with nurses available on-call during off-hours.
On the other hand, Developing a comprehensive care plan for each resident, Ensuring the facility is in compliance with state and federal regulations, and Maintaining a safe and sanitary environment for residents are all mandatory requirements for a Medicare-certified SNF.