Table 1.

Comorbid diagnoses by ICD-9-CM classification.

Comorbidity	ICD-9-CM Code
Previous Myocardial Infarction	410.xx
Hyperlipidemia	272.xx
Diabetes Mellitus	250.xx, V58.67
Heart Failure	398.91, 402.x1, 404.x1, 404.x3, 428.xx
Chronic Kidney Disease	403.xx, 404.xx, 585.xx
End-Stage Renal Disease	585.6
Cerebrovascular Disease	430.xx–438.xx
Liver Disease	570.xx–573.xx