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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  • I50.812—

    Chronic right heart failure

  • I50.813—

    Acute on chronic right heart failure

  • I50.814—

    Right heart failure due to left heart failure

  • I50.82—

    Biventricular heart failure

  • I50.83—

    High output heart failure

  • I50.84—

    End stage heart failure

  • I50.89—

    Other heart failure

  • I50.9—

    Heart failure, unspecified

  • I51.0—

    Cardiac septal defect, acquired

  • I51.1—

    Rupture of chordae tendineae, not elsewhere classified

  • I51.2—

    Rupture of papillary muscle, not elsewhere classified

  • I51.3—

    Intracardiac thrombosis, not elsewhere classified

  • I51.4—

    Myocarditis, unspecified

  • I51.5—

    Myocardial degeneration

  • I51.7—

    Cardiomegaly

  • I51.81—

    Takotsubo syndrome

  • I51.89—

    Other ill-defined heart diseases

  • I51.9—

    Heart disease, unspecified

  • I52—

    Other heart disorders in diseases classified elsewhere

  • I5A—

    Non-ischemic myocardial injury (non-traumatic)

  • I60.00—

    Nontraumatic subarachnoid hemorrhage from unspecified carotid siphon and bifurcation

  • I60.01—

    Nontraumatic subarachnoid hemorrhage from right carotid siphon and bifurcation

  • I60.02—

    Nontraumatic subarachnoid hemorrhage from left carotid siphon and bifurcation

  • I60.10—

    Nontraumatic subarachnoid hemorrhage from unspecified middle cerebral artery

  • I60.11—

    Nontraumatic subarachnoid hemorrhage from right middle cerebral artery

  • I60.12—

    Nontraumatic subarachnoid hemorrhage from left middle cerebral artery

  • I60.2—

    Nontraumatic subarachnoid hemorrhage from anterior communicating artery

  • I60.30—

    Nontraumatic subarachnoid hemorrhage from unspecified posterior communicating artery

  • I60.31—

    Nontraumatic subarachnoid hemorrhage from right posterior communicating artery

  • I60.32—

    Nontraumatic subarachnoid hemorrhage from left posterior communicating artery

  • I60.4—

    Nontraumatic subarachnoid hemorrhage from basilar artery

  • I60.50—

    Nontraumatic subarachnoid hemorrhage from unspecified vertebral artery

  • I60.51—

    Nontraumatic subarachnoid hemorrhage from right vertebral artery

  • I60.52—

    Nontraumatic subarachnoid hemorrhage from left vertebral artery

  • I60.6—

    Nontraumatic subarachnoid hemorrhage from other intracranial arteries

  • I60.7—

    Nontraumatic subarachnoid hemorrhage from unspecified intracranial artery

  • I60.8—

    Other nontraumatic subarachnoid hemorrhage

  • I60.9—

    Nontraumatic subarachnoid hemorrhage, unspecified

  • I61.0—

    Nontraumatic intracerebral hemorrhage in hemisphere, subcortical

  • I61.1—

    Nontraumatic intracerebral hemorrhage in hemisphere, cortical

  • I61.2—

    Nontraumatic intracerebral hemorrhage in hemisphere, unspecified

  • I61.3—

    Nontraumatic intracerebral hemorrhage in brain stem

  • I61.4—

    Nontraumatic intracerebral hemorrhage in cerebellum

  • I61.5—

    Nontraumatic intracerebral hemorrhage, intraventricular

  • I61.6—

    Nontraumatic intracerebral hemorrhage, multiple localized

  • I61.8—

    Other nontraumatic intracerebral hemorrhage

  • I61.9—

    Nontraumatic intracerebral hemorrhage, unspecified

  • I62.00—

    Nontraumatic subdural hemorrhage, unspecified

  • I62.01—

    Nontraumatic acute subdural hemorrhage

  • I62.02—

    Nontraumatic subacute subdural hemorrhage

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