In HEDIS, what does the "Utilization" measure assess?

The "Utilization" measure in HEDIS specifically assesses the appropriateness and frequency of healthcare services used by patients. This is crucial because it provides insights into patterns of healthcare consumption, ensuring that patients receive the level of care necessary for their health needs while evaluating whether resources are used efficiently. This measure helps healthcare providers identify areas where care may be overused or underused, fostering improvements in patient outcomes and resource allocation.

In contrast, the other options do not capture the essence of what "Utilization" measures in HEDIS. The volume of patients seen annually focuses more on the quantity of care provided rather than its appropriateness. The prevalence of diseases in the community relates to public health metrics rather than the specifics of healthcare service use. Financial expenditures, while relevant in assessing healthcare efficiency, do not provide insights into the appropriateness and frequency of care delivery itself. Thus, option C accurately reflects the core purpose of the utilization measure in HEDIS.