Concept Set Distributions Study Results IV: PAQS Query 3

- Most codes have expected longitduinal variation across sites, but site-specific differences in code utilization across the time period are visible. For example, C7 and C10 sites consistently utilize E11.65 more often than other sites in the network, while they consistently under utilize E11.22. - Notable switch-offs between ICD9 and ICD10 are also visible. For example, E11.9 (the most commonly used T2DM code) is picked up by most sites around 2015, while 250.02 is used by most sites prior to 2015 but is then dropped. Similar behavior can be seen with ketoacidosis diagnosis codes.