Answer: A
I70.26 is the appropriate code here because it is used to code for “Atherosclerosis of native arteries of the extremities” which is the diagnosis in this patient.
Option B is not correct because I96 specifies unspecified gangrene. Here, gangrene is because of atherosclerosis, so this is not appropriate.
Option C is not correct because I70.2 specifies Atherosclerosis of native arteries of the extremities. Here, gangrene is not mentioned.
Option D is not correct because I71.0 specifies the dissection of the aorta.