Table 1.

Classification Performance of International Classification of Diseases Clinical Modification 9^th and 10^th Edition Codes for Surveillance of Surgical Site Infections.

		Sensitivity			Specificity
Procedure	ICD Range	ICD-9 (95% CI)	ICD-10 (95% CI)	Difference (95% CI)	ICD-9 (95% CI)	ICD-10 (95% CI)	Difference (95% CI)
Colectomy	Narrow	0.45 (0.39-0.50)	0.38 (0.31-0.452)	−0.06 (−0.15-0.03)	0.97 (0.96-0.97)	0.98 (0.98-0.99)	0.02 (0.01-0.02)
Hysterectomy	Narrow	0.50 (0.42-0.58)	0.60 (0.45-0.74)	0.10 (−0.10-0.30)	0.99 (0.98-0.99)	0.99 (0.98-0.99)	0.002 (−0.004-0.008)
All	Narrow	0.46 (0.42-0.51)	0.43 (0.36-0.49)	−0.03 (−0.12-0.04)	0.98 (0.97-0.98)	0.98 (0.98-0.99)	0.007 (0.002-0.01)
Colectomy	Expanded	0.60 (0.54-0.65)	0.49 (0.42-0.60)	−0.11 (−0.20- −0.02)	0.91 (0.90-0.92)	0.94 (0.93-0.95)	0.03 (0.02-0.04)
Hysterectomy	Expanded	0.64 (0.57-0.72)	0.71 (0.57-0.83)	0.07 (−0.11-0.26)	0.97 (0.97-0.98)	0.96 (0.96-0.97)	−0.008 (−0.2-0.0)
All	Expanded	0.61 (0.57-0.65)	0.53 (0.47-0.60)	−0.08 (−0.16-0.00)	0.95 (0.94-0.95)	0.95 (0.94-0.96)	0.005 (−0.002-0.01)

CI, Confidence Interval; ICD, International Classification of Diseases