Table 5.

Definition of type 2 diabetes.

Study site	Diagnoses codes	Laboratory measuresa	Medication ordersb	Exclusions
Geisinger and Johns Hopkins University	ICDc-9, ICD-10, or EDGd code for T2D on two separate dates	≥1 elevated HbA1ce or glucose measure and ≥1 diagnosis code for T2D	≥1 T2D medication order	≥10 years of T1Df diagnoses and <5 years of T2Dg diagnoses or first diabetes code before 10 years of age or only meet criteria during pregnancy
New York University School of Medicine	ICD-9 or ICD-10 code for T2D on two separate dates	≥2 elevated HbA1c or glucose measure and ≥1 diagnosis code for T2D	≥1 T2D medication order	N/Ah
University of Alabama at Birminghami	N/A	Elevated glucose measure at study visit	Self-report of T2D medication	N/A

^aHbA_1c≥6.5%, random glucose≥200 mg/dl, and fasting glucose≥126 mg/dl.

^bExcluding Metformin and Acarbose: Reasons for Geographic and Racial Differences in Stroke project.

^cICD: International Classification of Diseases.

^dEDG: Epic Diagnostic code Groupers.

^eHbA_1c: glycated hemoglobin.

^fT1D: type 1 diabetes.

^gT2D: type 2 diabetes.

^hN/A: not applicable.

ⁱFrom the Reasons for Geographic and Racial Differences in Stroke Study.