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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  • I63.342—

    Cerebral infarction due to thrombosis of left cerebellar artery

  • I63.343—

    Cerebral infarction due to thrombosis of bilateral cerebellar arteries

  • I63.349—

    Cerebral infarction due to thrombosis of unspecified cerebellar artery

  • I63.39—

    Cerebral infarction due to thrombosis of other cerebral artery

  • I63.40—

    Cerebral infarction due to embolism of unspecified cerebral artery

  • I63.411—

    Cerebral infarction due to embolism of right middle cerebral artery

  • I63.412—

    Cerebral infarction due to embolism of left middle cerebral artery

  • I63.413—

    Cerebral infarction due to embolism of bilateral middle cerebral arteries

  • I63.419—

    Cerebral infarction due to embolism of unspecified middle cerebral artery

  • I63.421—

    Cerebral infarction due to embolism of right anterior cerebral artery

  • I63.422—

    Cerebral infarction due to embolism of left anterior cerebral artery

  • I63.423—

    Cerebral infarction due to embolism of bilateral anterior cerebral arteries

  • I63.429—

    Cerebral infarction due to embolism of unspecified anterior cerebral artery

  • I63.431—

    Cerebral infarction due to embolism of right posterior cerebral artery

  • I63.432—

    Cerebral infarction due to embolism of left posterior cerebral artery

  • I63.433—

    Cerebral infarction due to embolism of bilateral posterior cerebral arteries

  • I63.439—

    Cerebral infarction due to embolism of unspecified posterior cerebral artery

  • I63.441—

    Cerebral infarction due to embolism of right cerebellar artery

  • I63.442—

    Cerebral infarction due to embolism of left cerebellar artery

  • I63.443—

    Cerebral infarction due to embolism of bilateral cerebellar arteries

  • I63.449—

    Cerebral infarction due to embolism of unspecified cerebellar artery

  • I63.49—

    Cerebral infarction due to embolism of other cerebral artery

  • I63.50—

    Cerebral infarction due to unspecified occlusion or stenosis of unspecified cerebral artery

  • I63.511—

    Cerebral infarction due to unspecified occlusion or stenosis of right middle cerebral artery

  • I63.512—

    Cerebral infarction due to unspecified occlusion or stenosis of left middle cerebral artery

  • I63.513—

    Cerebral infarction due to unspecified occlusion or stenosis of bilateral middle cerebral arteries

  • I63.519—

    Cerebral infarction due to unspecified occlusion or stenosis of unspecified middle cerebral artery

  • I63.521—

    Cerebral infarction due to unspecified occlusion or stenosis of right anterior cerebral artery

  • I63.522—

    Cerebral infarction due to unspecified occlusion or stenosis of left anterior cerebral artery

  • I63.523—

    Cerebral infarction due to unspecified occlusion or stenosis of bilateral anterior cerebral arteries

  • I63.529—

    Cerebral infarction due to unspecified occlusion or stenosis of unspecified anterior cerebral artery

  • I63.531—

    Cerebral infarction due to unspecified occlusion or stenosis of right posterior cerebral artery

  • I63.532—

    Cerebral infarction due to unspecified occlusion or stenosis of left posterior cerebral artery

  • I63.533—

    Cerebral infarction due to unspecified occlusion or stenosis of bilateral posterior cerebral arteries

  • I63.539—

    Cerebral infarction due to unspecified occlusion or stenosis of unspecified posterior cerebral artery

  • I63.541—

    Cerebral infarction due to unspecified occlusion or stenosis of right cerebellar artery

  • I63.542—

    Cerebral infarction due to unspecified occlusion or stenosis of left cerebellar artery

  • I63.543—

    Cerebral infarction due to unspecified occlusion or stenosis of bilateral cerebellar arteries

  • I63.549—

    Cerebral infarction due to unspecified occlusion or stenosis of unspecified cerebellar artery

  • I63.59—

    Cerebral infarction due to unspecified occlusion or stenosis of other cerebral artery

  • I63.6—

    Cerebral infarction due to cerebral venous thrombosis, nonpyogenic

  • I63.81—

    Other cerebral infarction due to occlusion or stenosis of small artery

  • I63.89—

    Other cerebral infarction

  • I63.9—

    Cerebral infarction, unspecified

  • I65.01—

    Occlusion and stenosis of right vertebral artery

  • I65.02—

    Occlusion and stenosis of left vertebral artery

  • I65.03—

    Occlusion and stenosis of bilateral vertebral arteries

  • I65.09—

    Occlusion and stenosis of unspecified vertebral artery

  • I65.1—

    Occlusion and stenosis of basilar artery

  • I65.21—

    Occlusion and stenosis of right carotid artery

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