Patient presents with right foot gangrene, manifesting as dry gangrene with clear demarcation.  The affected area encompasses the distal phalanges of the second, third, and fourth toes, exhibiting dry, mummified tissue, blackened discoloration, and a distinct line of demarcation separating healthy from necrotic tissue.  Peripheral artery disease (PAD) is the suspected underlying etiology, supported by a history of intermittent claudication, diminished pedal pulses, and cool skin temperature.  Diagnostic testing, including lower extremity arterial Doppler ultrasound and ankle-brachial index (ABI), is planned to assess vascular compromise.  Differential diagnoses considered include critical limb ischemia, diabetic foot ulcer with superimposed infection, and frostbite.  Current treatment plan focuses on wound care management with debridement of necrotic tissue, pain management with appropriate analgesics, and optimization of vascular flow.  Patient education regarding foot care, diabetes management, and smoking cessation was provided.  Referral to vascular surgery for further evaluation and consideration for revascularization procedures is pending.  Prognosis is guarded, with potential complications including amputation, sepsis, and osteomyelitis.  Coding considerations include ICD-10 codes for gangrene, PAD, and diabetes, if applicable.  Follow-up appointment scheduled in one week to assess wound healing and evaluate vascular status.