Variable	ICD-9 codes
Diabetes	250.xx
Foot ulcer severity
Early stage foot ulcer	440.23, 707.1x, 707.9
Osteomyelitis	730.07, 730.17, 730.27, 730.97
Gangrene	0.40.0, 440.24, and 785.4 but only if at least one of the following vascular disease codes is also present: 250.7, 440.2, 440.21, 440.22, 440.23
Comorbidities
Peripheral neuropathy	250.6x, 355.xx, 337.1, 357.2
Coronary artery disease	410.xx, 411.1x, 427.4, 427.5
Peripheral arterial disease	250.7, 443.9
History of stroke	433.01, 433.11, 433.21, 433.31, 433.81, 433.91, 434.01, 434.1, 434.11, 434.9, 434.91, 436, 431, 430
History of vascular procedure	440.20 – 440.24
History of eye disease	250.x, 362.01 – 362.067, 362.83, 366.41, 369.xx
Foot deformity	94.0, 713.5, 727.1, 735.0, 735.2, 735.4 – 735.9