Table 3:

Accuracy of obesity-related ICD codes within the entire cohort and among patients with Type 2 Diabetes.

	All patients				Patients with type 2 diabetes
	Sensitivity %	Specificity %	PPV %	NPV %	Sensitivity %	Specificity %	PPV %	NPV %
Underweight and normal weight: BMI <25	6.5	99.7	90.0	70.7	12.7	99.6	85.7	85.5
Overweight: BMI 25–29.9	7.9	97.4	63.5	64.9	13.6	96.4	63.8	70.6
Obese: BMI 30–39.9	5.2	99.7	86.3	72.7	8.5	99.1	87.0	72.6
Severe obese: BMI ≥ 40	30.9	98.9	58.6	96.7	39.8	97.2	64.2	92.8
Obese or severe obese: BMI ≥ 30 *	40.4	97.0	86.9	76.8	57.7	91.8	88.4	66.7
Overweight, obese or severe obese: BMI ≥ 25 *	27.9	98.2	97.3	37.6	47.5	94.6	97.9	25.9

Abbreviations: body mass index (BMI), International classification of diseases (ICD), positive predictive value (PPV), negative predictive value (NPV)

^*categories for obesity include ICD codes for unspecified obesity