Final answer:
Utilization review is a method of controlling health care costs by assessing the necessity of care, length of stay, and discharge planning.
Step-by-step explanation:
The method of controlling health care costs by reviewing the necessity of care, length of stay, and discharge planning is called utilization review. Utilization review involves assessing the appropriateness and efficiency of healthcare services to ensure that patients receive necessary care without incurring excessive costs. This process plays a crucial role in managing healthcare expenses and optimizing resource allocation.