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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  • I34.9—

    Nonrheumatic mitral valve disorder, unspecified

  • I35.0—

    Nonrheumatic aortic (valve) stenosis

  • I35.1—

    Nonrheumatic aortic (valve) insufficiency

  • I35.2—

    Nonrheumatic aortic (valve) stenosis with insufficiency

  • I35.8—

    Other nonrheumatic aortic valve disorders

  • I35.9—

    Nonrheumatic aortic valve disorder, unspecified

  • I36.0—

    Nonrheumatic tricuspid (valve) stenosis

  • I36.1—

    Nonrheumatic tricuspid (valve) insufficiency

  • I36.2—

    Nonrheumatic tricuspid (valve) stenosis with insufficiency

  • I36.8—

    Other nonrheumatic tricuspid valve disorders

  • I36.9—

    Nonrheumatic tricuspid valve disorder, unspecified

  • I37.0—

    Nonrheumatic pulmonary valve stenosis

  • I37.1—

    Nonrheumatic pulmonary valve insufficiency

  • I37.2—

    Nonrheumatic pulmonary valve stenosis with insufficiency

  • I37.8—

    Other nonrheumatic pulmonary valve disorders

  • I37.9—

    Nonrheumatic pulmonary valve disorder, unspecified

  • I38—

    Endocarditis, valve unspecified

  • I39—

    Endocarditis and heart valve disorders in diseases classified elsewhere

  • I40.0—

    Infective myocarditis

  • I40.1—

    Isolated myocarditis

  • I40.8—

    Other acute myocarditis

  • I40.9—

    Acute myocarditis, unspecified

  • I41—

    Myocarditis in diseases classified elsewhere

  • I42.0—

    Dilated cardiomyopathy

  • I42.1—

    Obstructive hypertrophic cardiomyopathy

  • I42.2—

    Other hypertrophic cardiomyopathy

  • I42.3—

    Endomyocardial (eosinophilic) disease

  • I42.4—

    Endocardial fibroelastosis

  • I42.5—

    Other restrictive cardiomyopathy

  • I42.6—

    Alcoholic cardiomyopathy

  • I42.7—

    Cardiomyopathy due to drug and external agent

  • I42.8—

    Other cardiomyopathies

  • I42.9—

    Cardiomyopathy, unspecified

  • I43—

    Cardiomyopathy in diseases classified elsewhere

  • I44.0—

    Atrioventricular block, first degree

  • I44.1—

    Atrioventricular block, second degree

  • I44.2—

    Atrioventricular block, complete

  • I44.30—

    Unspecified atrioventricular block

  • I44.39—

    Other atrioventricular block

  • I44.4—

    Left anterior fascicular block

  • I44.5—

    Left posterior fascicular block

  • I44.60—

    Unspecified fascicular block

  • I44.69—

    Other fascicular block

  • I44.7—

    Left bundle-branch block, unspecified

  • I45.0—

    Right fascicular block

  • I45.10—

    Unspecified right bundle-branch block

  • I45.19—

    Other right bundle-branch block

  • I45.2—

    Bifascicular block

  • I45.3—

    Trifascicular block

  • I45.4—

    Nonspecific intraventricular block

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