TABLE 1.

Classification of Comorbidities by ICD-9 Code

Comorbidity	ICD-9 Codes
Cancer	140–208, 230–234
Cardiovascular disease	410–414, 428
Other musculoskeletal diseases	274, 710–714, 716–739 and not 711.0
Diabetes	250
Psychiatric disorders	296–311
Chronic obstructive pulmonary disease	490–496, 500–508

ICD indicates International Classification of Diseases.