I am still confused on how to code(icd 10) the situation below as i believe some of them are connected. Is anybody here can help me? Thank you so much guys.

In problem list:
CAD
Peripheral Arterial Occlusive Disease
Arterial Occlusive Disease
Cellulitis of Right Foot
Atherosclerosis of native artery of leg with ulceration of foot

Subj: Patient has arterial occlusive disease s/p bypass surgery