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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  • I45.5—

    Other specified heart block

  • I45.6—

    Pre-excitation syndrome

  • I45.81—

    Long QT syndrome

  • I45.89—

    Other specified conduction disorders

  • I45.9—

    Conduction disorder, unspecified

  • I46.2—

    Cardiac arrest due to underlying cardiac condition

  • I46.8—

    Cardiac arrest due to other underlying condition

  • I46.9—

    Cardiac arrest, cause unspecified

  • I47.0—

    Re-entry ventricular arrhythmia

  • I47.10—

    Supraventricular tachycardia, unspecified

  • I47.11—

    Inappropriate sinus tachycardia, so stated

  • I47.19—

    Other supraventricular tachycardia

  • I47.20—

    Ventricular tachycardia, unspecified

  • I47.21—

    Torsades de pointes

  • I47.29—

    Other ventricular tachycardia

  • I47.9—

    Paroxysmal tachycardia, unspecified

  • I48.0—

    Paroxysmal atrial fibrillation

  • I48.11—

    Longstanding persistent atrial fibrillation

  • I48.19—

    Other persistent atrial fibrillation

  • I48.20—

    Chronic atrial fibrillation, unspecified

  • I48.21—

    Permanent atrial fibrillation

  • I48.3—

    Typical atrial flutter

  • I48.4—

    Atypical atrial flutter

  • I48.91—

    Unspecified atrial fibrillation

  • I48.92—

    Unspecified atrial flutter

  • I49.01—

    Ventricular fibrillation

  • I49.02—

    Ventricular flutter

  • I49.1—

    Atrial premature depolarization

  • I49.2—

    Junctional premature depolarization

  • I49.3—

    Ventricular 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

  • I50.1—

    Left ventricular failure, unspecified

  • 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

  • I50.30—

    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

  • I50.40—

    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

  • I50.810—

    Right heart failure, unspecified

  • I50.811—

    Acute right heart failure

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