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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  • I62.03—

    Nontraumatic chronic subdural hemorrhage

  • I62.1—

    Nontraumatic extradural hemorrhage

  • I62.9—

    Nontraumatic intracranial hemorrhage, unspecified

  • I63.00—

    Cerebral infarction due to thrombosis of unspecified precerebral artery

  • I63.011—

    Cerebral infarction due to thrombosis of right vertebral artery

  • I63.012—

    Cerebral infarction due to thrombosis of left vertebral artery

  • I63.013—

    Cerebral infarction due to thrombosis of bilateral vertebral arteries

  • I63.019—

    Cerebral infarction due to thrombosis of unspecified vertebral artery

  • I63.02—

    Cerebral infarction due to thrombosis of basilar artery

  • I63.031—

    Cerebral infarction due to thrombosis of right carotid artery

  • I63.032—

    Cerebral infarction due to thrombosis of left carotid artery

  • I63.033—

    Cerebral infarction due to thrombosis of bilateral carotid arteries

  • I63.039—

    Cerebral infarction due to thrombosis of unspecified carotid artery

  • I63.09—

    Cerebral infarction due to thrombosis of other precerebral artery

  • I63.10—

    Cerebral infarction due to embolism of unspecified precerebral artery

  • I63.111—

    Cerebral infarction due to embolism of right vertebral artery

  • I63.112—

    Cerebral infarction due to embolism of left vertebral artery

  • I63.113—

    Cerebral infarction due to embolism of bilateral vertebral arteries

  • I63.119—

    Cerebral infarction due to embolism of unspecified vertebral artery

  • I63.12—

    Cerebral infarction due to embolism of basilar artery

  • I63.131—

    Cerebral infarction due to embolism of right carotid artery

  • I63.132—

    Cerebral infarction due to embolism of left carotid artery

  • I63.133—

    Cerebral infarction due to embolism of bilateral carotid arteries

  • I63.139—

    Cerebral infarction due to embolism of unspecified carotid artery

  • I63.19—

    Cerebral infarction due to embolism of other precerebral artery

  • I63.20—

    Cerebral infarction due to unspecified occlusion or stenosis of unspecified precerebral arteries

  • I63.211—

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

  • I63.212—

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

  • I63.213—

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

  • I63.219—

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

  • I63.22—

    Cerebral infarction due to unspecified occlusion or stenosis of basilar artery

  • I63.231—

    Cerebral infarction due to unspecified occlusion or stenosis of right carotid arteries

  • I63.232—

    Cerebral infarction due to unspecified occlusion or stenosis of left carotid arteries

  • I63.233—

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

  • I63.239—

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

  • I63.29—

    Cerebral infarction due to unspecified occlusion or stenosis of other precerebral arteries

  • I63.30—

    Cerebral infarction due to thrombosis of unspecified cerebral artery

  • I63.311—

    Cerebral infarction due to thrombosis of right middle cerebral artery

  • I63.312—

    Cerebral infarction due to thrombosis of left middle cerebral artery

  • I63.313—

    Cerebral infarction due to thrombosis of bilateral middle cerebral arteries

  • I63.319—

    Cerebral infarction due to thrombosis of unspecified middle cerebral artery

  • I63.321—

    Cerebral infarction due to thrombosis of right anterior cerebral artery

  • I63.322—

    Cerebral infarction due to thrombosis of left anterior cerebral artery

  • I63.323—

    Cerebral infarction due to thrombosis of bilateral anterior cerebral arteries

  • I63.329—

    Cerebral infarction due to thrombosis of unspecified anterior cerebral artery

  • I63.331—

    Cerebral infarction due to thrombosis of right posterior cerebral artery

  • I63.332—

    Cerebral infarction due to thrombosis of left posterior cerebral artery

  • I63.333—

    Cerebral infarction due to thrombosis of bilateral posterior cerebral arteries

  • I63.339—

    Cerebral infarction due to thrombosis of unspecified posterior cerebral artery

  • I63.341—

    Cerebral infarction due to thrombosis of right cerebellar artery

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