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This report describes analytical methodologies, estimates, and technical considerations related to the measurement of health care utilization in Medicare Part C encounter data (ED) submitted by organizations offering Medicare Advantage plans to Medicare beneficiaries. The primary aim of the report is to provide technical details for researchers on the structure and scope of ED and on the methodological steps and analytical decisions necessary to assess utilization of health care services using ED. The authors identify key considerations related to enrollment, differences in ED and Medicare claims data, and decisions that researchers must make about data field selection. From 2015 to 2016, there was a slight decrease in inpatient hospital stays (from 0.231 to 0.225 per enrollee) and a slight increase in professional visits (from 21.095 to 21.292 per enrollee). Outpatient facility visits, emergency department visits, and other outpatient facility visits increased slightly.