Final answer:
A nursing diagnosis is a statement of patient health concerns and can address actual or potential health issues within the nurse's scope of practice, different from a medical diagnosis.
Step-by-step explanation:
A nursing diagnosis is best described as: D) a concise statement of actual or potential health concerns or level of wellness. It is a critical component of the nursing process that involves a thorough assessment of the patient's health status. Unlike a medical diagnosis, which identifies a specific disease, a nursing diagnosis focuses on the patient's response to health and life processes and the actual or potential health problems that nurses can address within their scope of practice. It sets the foundation for selecting nursing interventions to achieve outcomes for which the nurse holds accountability.