All ICD10 Codes
Chapter 9

I00–I99: Diseases of the Circulatory System

Diseases of the Circulatory System diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)
All CodesBillable Only
Internal Codes
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  • I70.349—

    Atherosclerosis of unspecified type of bypass graft(s) of the left leg with ulceration of unspecified site

  • I70.35—

    Atherosclerosis of unspecified type of bypass graft(s) of other extremity with ulceration

  • I70.361—

    Atherosclerosis of unspecified type of bypass graft(s) of the extremities with gangrene, right leg

  • I70.362—

    Atherosclerosis of unspecified type of bypass graft(s) of the extremities with gangrene, left leg

  • I70.363—

    Atherosclerosis of unspecified type of bypass graft(s) of the extremities with gangrene, bilateral legs

  • I70.368—

    Atherosclerosis of unspecified type of bypass graft(s) of the extremities with gangrene, other extremity

  • I70.369—

    Atherosclerosis of unspecified type of bypass graft(s) of the extremities with gangrene, unspecified extremity

  • I70.391—

    Other atherosclerosis of unspecified type of bypass graft(s) of the extremities, right leg

  • I70.392—

    Other atherosclerosis of unspecified type of bypass graft(s) of the extremities, left leg

  • I70.393—

    Other atherosclerosis of unspecified type of bypass graft(s) of the extremities, bilateral legs

  • I70.398—

    Other atherosclerosis of unspecified type of bypass graft(s) of the extremities, other extremity

  • I70.399—

    Other atherosclerosis of unspecified type of bypass graft(s) of the extremities, unspecified extremity

  • I70.401—

    Unspecified atherosclerosis of autologous vein bypass graft(s) of the extremities, right leg

  • I70.402—

    Unspecified atherosclerosis of autologous vein bypass graft(s) of the extremities, left leg

  • I70.403—

    Unspecified atherosclerosis of autologous vein bypass graft(s) of the extremities, bilateral legs

  • I70.408—

    Unspecified atherosclerosis of autologous vein bypass graft(s) of the extremities, other extremity

  • I70.409—

    Unspecified atherosclerosis of autologous vein bypass graft(s) of the extremities, unspecified extremity

  • I70.411—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with intermittent claudication, right leg

  • I70.412—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with intermittent claudication, left leg

  • I70.413—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with intermittent claudication, bilateral legs

  • I70.418—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with intermittent claudication, other extremity

  • I70.419—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with intermittent claudication, unspecified extremity

  • I70.421—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with rest pain, right leg

  • I70.422—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with rest pain, left leg

  • I70.423—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with rest pain, bilateral legs

  • I70.428—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with rest pain, other extremity

  • I70.429—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with rest pain, unspecified extremity

  • I70.431—

    Atherosclerosis of autologous vein bypass graft(s) of the right leg with ulceration of thigh

  • I70.432—

    Atherosclerosis of autologous vein bypass graft(s) of the right leg with ulceration of calf

  • I70.433—

    Atherosclerosis of autologous vein bypass graft(s) of the right leg with ulceration of ankle

  • I70.434—

    Atherosclerosis of autologous vein bypass graft(s) of the right leg with ulceration of heel and midfoot

  • I70.435—

    Atherosclerosis of autologous vein bypass graft(s) of the right leg with ulceration of other part of foot

  • I70.438—

    Atherosclerosis of autologous vein bypass graft(s) of the right leg with ulceration of other part of lower leg

  • I70.439—

    Atherosclerosis of autologous vein bypass graft(s) of the right leg with ulceration of unspecified site

  • I70.441—

    Atherosclerosis of autologous vein bypass graft(s) of the left leg with ulceration of thigh

  • I70.442—

    Atherosclerosis of autologous vein bypass graft(s) of the left leg with ulceration of calf

  • I70.443—

    Atherosclerosis of autologous vein bypass graft(s) of the left leg with ulceration of ankle

  • I70.444—

    Atherosclerosis of autologous vein bypass graft(s) of the left leg with ulceration of heel and midfoot

  • I70.445—

    Atherosclerosis of autologous vein bypass graft(s) of the left leg with ulceration of other part of foot

  • I70.448—

    Atherosclerosis of autologous vein bypass graft(s) of the left leg with ulceration of other part of lower leg

  • I70.449—

    Atherosclerosis of autologous vein bypass graft(s) of the left leg with ulceration of unspecified site

  • I70.45—

    Atherosclerosis of autologous vein bypass graft(s) of other extremity with ulceration

  • I70.461—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with gangrene, right leg

  • I70.462—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with gangrene, left leg

  • I70.463—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with gangrene, bilateral legs

  • I70.468—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with gangrene, other extremity

  • I70.469—

    Atherosclerosis of autologous vein bypass graft(s) of the extremities with gangrene, unspecified extremity

  • I70.491—

    Other atherosclerosis of autologous vein bypass graft(s) of the extremities, right leg

  • I70.492—

    Other atherosclerosis of autologous vein bypass graft(s) of the extremities, left leg

  • I70.493—

    Other atherosclerosis of autologous vein bypass graft(s) of the extremities, bilateral legs

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