I70.662 Atherosclerosis of nonbiological bypass graft(s) of the extremities with gangrene, left leg

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from I70 Atherosclerosis

Includes

• arteriolosclerosis
• arterial degeneration
• arteriosclerosis
• arteriosclerotic vascular disease
• arteriovascular degeneration
• atheroma
• endarteritis deformans or obliterans
• senile arteritis
• senile endarteritis
• vascular degeneration

Excludes2 (not included here)

• arteriosclerotic cardiovascular disease (I25.1-)
• arteriosclerotic heart disease (I25.1-)
• atheroembolism (I75.-)
• cerebral atherosclerosis (I67.2)
• coronary atherosclerosis (I25.1-)
• mesenteric atherosclerosis (K55.1)
• precerebral atherosclerosis (I67.2)
• primary pulmonary atherosclerosis (I27.0)

Use additional code

• 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.-)
• tobacco use (Z72.0)

Applies from I70.6 Atherosclerosis of nonbiological bypass graft(s) of the extremities

Use additional code

• code, if applicable, to identify chronic total occlusion of artery of extremity (I70.92)

Applies from I70.66 Atherosclerosis of nonbiological bypass graft(s) of the extremities with gangrene

Includes

• any condition classifiable to I70.61-, I70.62-, I70.63-, I70.64-, I70.65
• chronic limb-threatening ischemia of nonbiological bypass graft(s) of the extremities with gangrene
• critical limb ischemia of nonbiological bypass graft(s) of the extremities with gangrene

Use additional code

• code to identify the severity of any ulcer (L97.-, L98.49-), if applicable

Risk adjustment (HCC)

• CMS-HCC V28: HCC 263 — Atherosclerosis of Arteries of the Extremities with Ulceration or Gangrene
• CMS-HCC V22: HCC 106 — Atherosclerosis of the Extremities with Ulceration or Gangrene
• ESRD V24: HCC 106

MS-DRG index

Defines the logic of DRG(s) 299-301 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 440.30 Atherosclerosis of unspecified bypass graft of the extremities (approximate)
• 785.4 Gangrene (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Adult diagnoses (age 15 through 124): Age conflict edit. These diagnoses are clinically expected only in patients age 15 through 124.

Code annotations containing back-references to I70.662

Back-references to I70.6

• Code First: I70.92 Chronic total occlusion of artery of the extremities ("atherosclerosis of arteries of the extremities (I70.2-, I70.3-, I70.4-, I70.5-, I70.6-, I70.7-)")

Back-references to I70

• Type 1 Excludes: I77.6 Arteritis, unspecified ("deformans (I70.-)")
• Type 1 Excludes: I77.6 Arteritis, unspecified ("obliterans (I70.-)")
• Type 1 Excludes: I77.6 Arteritis, unspecified ("senile (I70.-)")

Diagnosis Index entries for I70.662

• Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification) › with › critical limb ischemia › bypass graft › nonbiological graft › leg › left › with › gangrene (and intermittent claudication, rest pain, and ulcer)
• Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification) › extremities (native arteries) › bypass graft › nonbiological graft › leg › left › with › gangrene (and intermittent claudication, rest pain and ulcer)

Nearby codes

• I70.648 Atherosclerosis of nonbiological bypass graft(s) of the left leg with ulceration of other part of lower leg
• I70.649 Atherosclerosis of nonbiological bypass graft(s) of the left leg with ulceration of unspecified site
• I70.65 Atherosclerosis of nonbiological bypass graft(s) of other extremity with ulceration
• I70.66 Atherosclerosis of nonbiological bypass graft(s) of the extremities with gangrene
• I70.661 Atherosclerosis of nonbiological bypass graft(s) of the extremities with gangrene, right leg
• I70.662 Atherosclerosis of nonbiological bypass graft(s) of the extremities with gangrene, left leg (this code)
• I70.663 Atherosclerosis of nonbiological bypass graft(s) of the extremities with gangrene, bilateral legs
• I70.668 Atherosclerosis of nonbiological bypass graft(s) of the extremities with gangrene, other extremity
• I70.669 Atherosclerosis of nonbiological bypass graft(s) of the extremities with gangrene, unspecified extremity
• I70.69 Other atherosclerosis of nonbiological bypass graft(s) of the extremities
• I70.691 Other atherosclerosis of nonbiological bypass graft(s) of the extremities, right leg