Appendix 1.

ICD-9-CM codes used to define clinical conditions from NIS data from 2003 to 2006

Condition	ICD-9-CM Codes
AKI	Diagnosis codes 584.5, 584.6, 584.7, 584.8, 584.9
Dialysis	Diagnosis codes for AKI as above + V34.1, V560, V561, or procedure code 39.95
Mechanical ventilation	Procedure codes 93.90, 93.92, 96.01, 96.04, 96.05, 96.70, 96.71, 96.72
Sepsis	Diagnosis codes 038.x, 112.5, 112.81, 02.02, 79.07, 78.559
Pneumonia	Diagnosis codes 460.x, 481, 482.x, 483.x, 484.x, 485, 486
Acute myocardial infarction	Diagnosis codes 410.x
Heart failure	Diagnosis codes 428.x
Gastrointestinal hemorrhage	Diagnosis codes 578.x
Acute pancreatitis	Diagnosis code 577.0
Liver failure	Diagnosis code 570