Final answer:
The correct coding for a patient diagnosed with atherosclerosis of native arteries of the lower extremities with a nonhealing ulcer over the left ankle is C. L97.321, I70.243.
Step-by-step explanation:
The student is asking for the correct medical coding for a case involving a patient with a diagnosis of atherosclerosis of native arteries of the lower extremities and a nonhealing ulcer with associated skin breakdown over the left ankle. The appropriate coding for this scenario would be I70.243, L97.321, which represents atherosclerosis of native arteries of a limb with ulceration and the specific location of the ulcer, respectively.
Option C. L97.321, I70.243 is the correct answer as it includes both the diagnosis of the atherosclerosis with an ulceration specified to the left ankle (L97.321) and the atherosclerosis of native arteries of the extremities with the specific involvement of the lower extremity (I70.243).