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)
  • 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
Browse by Section10 Sections
Internal Codes
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  • I00—

    Rheumatic fever without heart involvement

  • I01—

    Rheumatic fever with heart involvement

  • I01.0—

    Acute rheumatic pericarditis

  • I01.1—

    Acute rheumatic endocarditis

  • I01.2—

    Acute rheumatic myocarditis

  • I01.8—

    Other acute rheumatic heart disease

  • I01.9—

    Acute rheumatic heart disease, unspecified

  • I02—

    Rheumatic chorea

  • I02.0—

    Rheumatic chorea with heart involvement

  • I02.9—

    Rheumatic chorea without heart involvement

  • I05—

    Rheumatic mitral valve diseases

  • I05.0—

    Rheumatic mitral stenosis

  • I05.1—

    Rheumatic mitral insufficiency

  • I05.2—

    Rheumatic mitral stenosis with insufficiency

  • I05.8—

    Other rheumatic mitral valve diseases

  • I05.9—

    Rheumatic mitral valve disease, unspecified

  • I06—

    Rheumatic aortic valve diseases

  • I06.0—

    Rheumatic aortic stenosis

  • I06.1—

    Rheumatic aortic insufficiency

  • I06.2—

    Rheumatic aortic stenosis with insufficiency

  • I06.8—

    Other rheumatic aortic valve diseases

  • I06.9—

    Rheumatic aortic valve disease, unspecified

  • I07—

    Rheumatic tricuspid valve diseases

  • I07.0—

    Rheumatic tricuspid stenosis

  • I07.1—

    Rheumatic tricuspid insufficiency

  • I07.2—

    Rheumatic tricuspid stenosis and insufficiency

  • I07.8—

    Other rheumatic tricuspid valve diseases

  • I07.9—

    Rheumatic tricuspid valve disease, unspecified

  • I08—

    Multiple valve diseases

  • I08.0—

    Rheumatic disorders of both mitral and aortic valves

  • I08.1—

    Rheumatic disorders of both mitral and tricuspid valves

  • I08.2—

    Rheumatic disorders of both aortic and tricuspid valves

  • I08.3—

    Combined rheumatic disorders of mitral, aortic and tricuspid valves

  • I08.8—

    Other rheumatic multiple valve diseases

  • I08.9—

    Rheumatic multiple valve disease, unspecified

  • I09—

    Other rheumatic heart diseases

  • I09.0—

    Rheumatic myocarditis

  • I09.1—

    Rheumatic diseases of endocardium, valve unspecified

  • I09.2—

    Chronic rheumatic pericarditis

  • I09.8—

    Other specified rheumatic heart diseases

  • I09.81—

    Rheumatic heart failure

  • I09.89—

    Other specified rheumatic heart diseases

  • I09.9—

    Rheumatic heart disease, unspecified

  • I10—

    Essential (primary) hypertension

  • I11—

    Hypertensive heart disease

  • I11.0—

    Hypertensive heart disease with heart failure

  • I11.9—

    Hypertensive heart disease without heart failure

  • I12—

    Hypertensive chronic kidney disease

  • I12.0—

    Hypertensive chronic kidney disease with stage 5 chronic kidney disease or end stage renal disease

  • I12.9—

    Hypertensive chronic kidney disease with stage 1 through stage 4 chronic kidney disease, or unspecified chronic kidney disease

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