Diabetic Foot Severity (IDSA/IWGDF): Categorizes the infection to guide antibiotic spectrum, inpatient vs outpatient care, and surgical urgency.
Uninfected
No symptoms or signs of infection
Mild
Involvement only of skin/SQ; Erythema 0.5–2 cm
Moderate
Erythema >2 cm or deep structures (bone/tendon)
Severe
Infection with SIRS (Temp/HR/RR/WBC flags)