Table 1. ICD-9-CM codes for DFI, health outcomes, and comorbidities.

Diagnosis or procedure	ICD-9-CM code
Foot infection
Gangrene	040.0; 440.24; 785.4 + (250.7 or 440.2X)
Osteomyelitis	730.07; 730.17; 730.27; 730.97
Ulcer	440.23; 707.1X
Cellulitis/abscess of foot	680.7; 682.7
Cellulitis/abscess of toe	681.10
Paronychia	681.11
Diabetes	250.00–250.93