Utilization measures
Measure name	Definition
Hospitalization rate, all-cause	Count of unique hospitalizations for any reason per month.
Hospitalization rate, ambulatory care-sensitive	Count of unique hospitalizations per month that meet one or more criteria for being ambulatory care-sensitive according to the Agency for Healthcare Research and Quality “Prevention Quality Indicators Technical Specifications,” Version 4.0. Specifications available from Agency for Healthcare Research and Quality, http://www.qualityindicators.ahrq.gov/Modules/PQI_TechSpec.aspx
Emergency department visit rate, all-cause	Count of unique emergency department visits for any reason per month.
Emergency department visit rate, ambulatory care-sensitive	Count of unique emergency department visits per month that have any evidence of being avoidable or primary care treatable according to the “NYU ED Algorithm,” specifications available from http://wagner.nyu.edu/faculty/billings/nyued-download. For each ED visit, the NYU algorithm assigns a probability that the visit is in one of 4 categories:     1- Non-Emergent;     2- Emergent, Primary Care Treatable;     3- Emergent, ED Care Needed, Preventable/Avoidable;     4- Emergent, ED Care Needed, Not Preventable/Avoidable. For this measure, we count an ED visit as “ambulatory care-sensitive” if it has a nonzero probability of belonging in any of the first 3 categories.
Ambulatory care visit rate	Count of unique ambulatory visits (excluding emergency department visits) for any reason per month.