Final answer:
The Joint Commission mandates a nutritional assessment or screen when the patient's needs and conditions warrant it, with attention to individual healthcare situations.
Step-by-step explanation:
The Joint Commission requires the performance of a nutritional assessment or screen when warranted by the patient's needs and conditions. This means that during any healthcare interaction—whether that be an emergency room visit, a visit to a hospital-owned physician office, or an outpatient setting—if the patient's medical condition or needs suggest the necessity for a nutritional assessment, then it must be conducted. The focus is on individual patient care and the specific circumstances that might affect that patient's nutritional status, which can be critical for their overall health and recovery.