I70Atherosclerosis

I70 is the ICD-10-CM diagnosis code for atherosclerosis. It belongs to 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 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: I70.0 (of aorta), I70.1 (of renal artery), I70.2 (of native arteries of the extremities), I70.3 (of unspecified type of bypass graft(s) of the extremities), I70.4 (of autologous vein bypass graft(s) of the extremities), I70.5 (of nonautologous biological bypass graft(s) of the extremities), I70.6 (of nonbiological bypass graft(s) of the extremities), I70.7 (of other type of bypass graft(s) of the extremities) and 2 more.

The conditions in its Excludes2 note aren't part of I70, but may be coded alongside it if the patient has both: arteriosclerotic cardiovascular disease (I25.1-), arteriosclerotic heart disease (I25.1-), atheroembolism (I75.-), cerebral atherosclerosis (I67.2) and 4 more.

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.