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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  • I49.01—

    Ventricular fibrillation

  • I49.02—

    Ventricular flutter

  • I49.1—

    Atrial premature depolarization

  • I49.2—

    Junctional premature depolarization

  • I49.3—

    Ventricular premature depolarization

  • I49.4—

    Other and unspecified premature depolarization

  • I49.40—

    Unspecified premature depolarization

  • I49.49—

    Other premature depolarization

  • I49.5—

    Sick sinus syndrome

  • I49.8—

    Other specified cardiac arrhythmias

  • I49.9—

    Cardiac arrhythmia, unspecified

  • I50—

    Heart failure

  • I50.1—

    Left ventricular failure, unspecified

  • I50.2—

    Systolic (congestive) heart failure

  • I50.20—

    Unspecified systolic (congestive) heart failure

  • I50.21—

    Acute systolic (congestive) heart failure

  • I50.22—

    Chronic systolic (congestive) heart failure

  • I50.23—

    Acute on chronic systolic (congestive) heart failure

  • I50.3—

    Diastolic (congestive) heart failure

  • I50.30—

    Unspecified diastolic (congestive) heart failure

  • I50.31—

    Acute diastolic (congestive) heart failure

  • I50.32—

    Chronic diastolic (congestive) heart failure

  • I50.33—

    Acute on chronic diastolic (congestive) heart failure

  • I50.4—

    Combined systolic (congestive) and diastolic (congestive) heart failure

  • I50.40—

    Unspecified combined systolic (congestive) and diastolic (congestive) heart failure

  • I50.41—

    Acute combined systolic (congestive) and diastolic (congestive) heart failure

  • I50.42—

    Chronic combined systolic (congestive) and diastolic (congestive) heart failure

  • I50.43—

    Acute on chronic combined systolic (congestive) and diastolic (congestive) heart failure

  • I50.8—

    Other heart failure

  • I50.81—

    Right heart failure

  • I50.810—

    Right heart failure, unspecified

  • I50.811—

    Acute right heart failure

  • 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—

    Complications and ill-defined descriptions of heart disease

  • 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

  • I51.8—

    Other ill-defined heart diseases

  • I51.81—

    Takotsubo syndrome

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