What is the definition of "denominator" in HEDIS terms?

In HEDIS terminology, the "denominator" refers to the eligible population for a measure. This population encompasses all individuals who meet specific criteria set for a particular quality measure, such as certain age ranges, diagnoses, or other relevant factors. The denominator serves as the baseline group against which performance is evaluated.

Utilizing the denominator allows for an objective assessment of healthcare quality by providing a context in which providers can compare their performance relative to others or to national standards. It effectively establishes the scope of patients for whom data is collected and analyzed, enabling meaningful insights into the delivery of care.

When analyzing healthcare measures, it is crucial to have a clear understanding of the eligible population, as it determines the validity and relevance of the data collected and reported. Therefore, the correct identification of the denominator is essential for both quality assessment and improvement efforts in healthcare delivery systems.