Figure 4.

High-level overview of the type 2 diabetes mellitus (T2DM) phenotype algorithm. The T2DM algorithm contains multiple nested Boolean operators expressed over diagnoses labs, and medications. It also includes a point- to-point temporal operation on timing of medication use. Use of disjunctive OR operator allows for mulitple paths to be selected into a T2DM cohort. The algorithm uses corresponding ICD9 codes for Diagnosis, Active, RxNorm codes of oral hypoglycemics for T2DM medications, and those of insulins for T1DM medications.