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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