I70.21Atherosclerosis of native arteries of extremities with intermittent claudication

I70.21 is the ICD-10-CM diagnosis code for atherosclerosis of native arteries of extremities with intermittent claudication. It belongs to category I70 (atherosclerosis), block I70-I79 (diseases of arteries, arterioles and capillaries) and chapter 9 (diseases of the circulatory system). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.

Within I70.2 (atherosclerosis of native arteries of the extremities), I70.21 is specifically for atherosclerosis of native arteries of extremities with intermittent claudication. Related codes cover unspecified atherosclerosis of native arteries of extremities (I70.20), atherosclerosis of native arteries of extremities with rest pain (I70.22), atherosclerosis of native arteries of right leg with ulceration (I70.23), atherosclerosis of native arteries of left leg with ulceration (I70.24), atherosclerosis of native arteries of other extremities with ulceration (I70.25), atherosclerosis of native arteries of extremities with gangrene (I70.26) and other atherosclerosis of native arteries of extremities (I70.29).

To report this condition, pick the subcode that matches the documentation: I70.211 (right leg), I70.212 (left leg), I70.213 (bilateral legs), I70.218 (other extremity) and I70.219 (unspecified extremity).

Use an additional code to identify: exposure to environmental tobacco smoke (Z77.22), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31), tobacco dependence (F17.-) and tobacco use (Z72.0).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.