1. I49 Other cardiac arrhythmias


    • neonatal dysrhythmia (P29.1-)
    • sinoatrial bradycardia (R00.1)
    • sinus bradycardia (R00.1)
    • vagal bradycardia (R00.1)


    1. I49.0 Ventricular fibrillation and flutter

      1. I49.01 Ventricular fibrillation

      2. I49.02 Ventricular flutter

    2. I49.1 Atrial premature depolarization

      Inclusion term(s):

      • Atrial premature beats
    3. I49.2 Junctional premature depolarization

    4. I49.3 Ventricular premature depolarization

    5. I49.4 Other and unspecified premature depolarization

      1. I49.40 Unspecified premature depolarization

        Inclusion term(s):

        • Premature beats NOS
      2. I49.49 Other premature depolarization

        Inclusion term(s):

        • Ectopic beats
        • Extrasystoles
        • Extrasystolic arrhythmias
        • Premature contractions
    6. I49.5 Sick sinus syndrome

      Inclusion term(s):

      • Tachycardia-bradycardia syndrome
    7. I49.8 Other specified cardiac arrhythmias

      Inclusion term(s):

      • Brugada syndrome
      • Coronary sinus rhythm disorder
      • Ectopic rhythm disorder
      • Nodal rhythm disorder
    8. I49.9 Cardiac arrhythmia, unspecified

      Inclusion term(s):

      • Arrhythmia (cardiac) NOS
Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.