Identifying patients with diabetes and the earliest date of diagnosis in real time: an electronic health record case-finding algorithm

Table 1 Variables included in the electronic diabetes case-finding model

Identification variable	Criteria^*	Encounter location	Point value
ICD-9 encounter code	250.xx	Inpatient or outpatient	0.75
Hemoglobin A1c	≥ 6.5%	Inpatient or outpatient	1.00
Fasting Blood Glucose	≥ 126 mg/dL	Outpatient only	0.50
Random blood glucose	≥ 200 mg/dL	Outpatient only	0.50
2-hour OGTT	≥ 200 mg/dL	Inpatient or outpatient	0.75
Problem list or PMH	250.xx	Inpatient or outpatient	0.40
Diabetes medication^**	Present	Outpatient only	1.00
Metformin	Present	Outpatient only	0.75

Abbreviations: ICD-9: International Classification of Diseases 9, OGTT: oral glucose tolerance test, PMH: past medical history, mg: milligram, dL: deciliter.
^*Criteria are counted only once except for ICD-9 codes (maximum twice) and random and fasting blood glucose (maximum twice each) as long as repeated glucose values are ≥ 3 months apart.
^**Insulin, sulfonylurea, thiazolidinedione, alpha glucosidase, DPP-4 inhibitor, meglitinide, amylin mimetic, incretin mimetic, combination medication.

ISSN: 1472-6947