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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  • I65.22—

    Occlusion and stenosis of left carotid artery

  • I65.23—

    Occlusion and stenosis of bilateral carotid arteries

  • I65.29—

    Occlusion and stenosis of unspecified carotid artery

  • I65.8—

    Occlusion and stenosis of other precerebral arteries

  • I65.9—

    Occlusion and stenosis of unspecified precerebral artery

  • I66.01—

    Occlusion and stenosis of right middle cerebral artery

  • I66.02—

    Occlusion and stenosis of left middle cerebral artery

  • I66.03—

    Occlusion and stenosis of bilateral middle cerebral arteries

  • I66.09—

    Occlusion and stenosis of unspecified middle cerebral artery

  • I66.11—

    Occlusion and stenosis of right anterior cerebral artery

  • I66.12—

    Occlusion and stenosis of left anterior cerebral artery

  • I66.13—

    Occlusion and stenosis of bilateral anterior cerebral arteries

  • I66.19—

    Occlusion and stenosis of unspecified anterior cerebral artery

  • I66.21—

    Occlusion and stenosis of right posterior cerebral artery

  • I66.22—

    Occlusion and stenosis of left posterior cerebral artery

  • I66.23—

    Occlusion and stenosis of bilateral posterior cerebral arteries

  • I66.29—

    Occlusion and stenosis of unspecified posterior cerebral artery

  • I66.3—

    Occlusion and stenosis of cerebellar arteries

  • I66.8—

    Occlusion and stenosis of other cerebral arteries

  • I66.9—

    Occlusion and stenosis of unspecified cerebral artery

  • I67.0—

    Dissection of cerebral arteries, nonruptured

  • I67.1—

    Cerebral aneurysm, nonruptured

  • I67.2—

    Cerebral atherosclerosis

  • I67.3—

    Progressive vascular leukoencephalopathy

  • I67.4—

    Hypertensive encephalopathy

  • I67.5—

    Moyamoya disease

  • I67.6—

    Nonpyogenic thrombosis of intracranial venous system

  • I67.7—

    Cerebral arteritis, not elsewhere classified

  • I67.81—

    Acute cerebrovascular insufficiency

  • I67.82—

    Cerebral ischemia

  • I67.83—

    Posterior reversible encephalopathy syndrome

  • I67.841—

    Reversible cerebrovascular vasoconstriction syndrome

  • I67.848—

    Other cerebrovascular vasospasm and vasoconstriction

  • I67.850—

    Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy

  • I67.858—

    Other hereditary cerebrovascular disease

  • I67.89—

    Other cerebrovascular disease

  • I67.9—

    Cerebrovascular disease, unspecified

  • I68.0—

    Cerebral amyloid angiopathy

  • I68.2—

    Cerebral arteritis in other diseases classified elsewhere

  • I68.8—

    Other cerebrovascular disorders in diseases classified elsewhere

  • I69.00—

    Unspecified sequelae of nontraumatic subarachnoid hemorrhage

  • I69.010—

    Attention and concentration deficit following nontraumatic subarachnoid hemorrhage

  • I69.011—

    Memory deficit following nontraumatic subarachnoid hemorrhage

  • I69.012—

    Visuospatial deficit and spatial neglect following nontraumatic subarachnoid hemorrhage

  • I69.013—

    Psychomotor deficit following nontraumatic subarachnoid hemorrhage

  • I69.014—

    Frontal lobe and executive function deficit following nontraumatic subarachnoid hemorrhage

  • I69.015—

    Cognitive social or emotional deficit following nontraumatic subarachnoid hemorrhage

  • I69.018—

    Other symptoms and signs involving cognitive functions following nontraumatic subarachnoid hemorrhage

  • I69.019—

    Unspecified symptoms and signs involving cognitive functions following nontraumatic subarachnoid hemorrhage

  • I69.020—

    Aphasia following nontraumatic subarachnoid hemorrhage

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