2025 ICD-10-CM Diagnosis Code I49.9

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Cardiac arrhythmia, unspecified

  • I49.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2025 edition of ICD-10-CM I49.9 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of I49.9 – other international versions of ICD-10 I49.9 may differ.

Applicable To

  • Arrhythmia (cardiac) NOS

The following code(s) above I49.9 contain annotation back-references

 that may be applicable to I49.9:

  • I00-I99  Diseases of the circulatory system
  • I49  Other cardiac arrhythmias

Approximate Synonyms

  • Atrial arrhythmia
  • Cardiac arrhythmia
  • Cardiac arrhythmia (heartbeat disturbance) in pregnancy
  • Cardiac arrhythmia in childbirth
  • Cardiac arrhythmia in pregnancy
  • Cardiac arrythmia complicating childbirth
  • Cardiac arrythmia in childbirth
  • Cardiac dysrhythmia (heart rhythm disorder)
  • Conduction disorder of the heart
  • Conduction disorder of the heart postpartum
  • Neonatal (newborn) arrhythmia
  • Neonatal dysrhythmia
  • Postpartum (after childbirth) cardiac arrhythmia
  • Postpartum (after childbirth) cardiac arrythmia
  • Ventricular arrhythmia
  • Ventricular arrhythmia (heart beat disorder)

Clinical Information

  • An arrhythmia is a problem with the rate or rhythm of your heartbeat. It means that your heart beats too quickly, too slowly, or with an irregular pattern. When the heart beats faster than normal, it is called tachycardia. When the heart beats too slowly, it is called bradycardia. The most common type of arrhythmia is atrial fibrillation, which causes an irregular and fast heart beat.many factors can affect your heart’s rhythm, such as having had a heart attack, smoking, congenital heart defects, and stress. Some substances or medicines may also cause arrhythmias. Symptoms of arrhythmias include
    • fast or slow heart beat
    • skipping beats
    • lightheadedness or dizziness
    • chest pain
    • shortness of breath
    • sweating
    your doctor can run tests to find out if you have an arrhythmia. Treatment to restore a normal heart rhythm may include medicines, an implantable cardioverter-defibrillator (icd) or pacemaker, or sometimes surgery.
  • Any disturbances of the normal rhythmic beating of the heart or myocardial contraction. Cardiac arrhythmias can be classified by the abnormalities in heart rate, disorders of electrical impulse generation, or impulse conduction.
  • Any variation from the normal rate or rhythm (which may include the origin of the impulse and/or its subsequent propagation) in the heart.
  • Any variation from the normal rhythm or rate of the heart beat.

ICD-10-CM I49.9 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

  • 308 Cardiac arrhythmia and conduction disorders with mcc
  • 309 Cardiac arrhythmia and conduction disorders with cc
  • 310 Cardiac arrhythmia and conduction disorders without cc/mcc

Convert I49.9 to ICD-9-CMCode History

  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change
  • 2025 (effective 10/1/2024): No change

Diagnosis Index entries containing back-references to I49.9:

  • Action, heart
    • irregular I49.9
    • disorder I49.9
  • Arrhythmia (auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle) I49.9
  • Disorder (of) – see also Disease
    • heart action I49.9
  • Disturbance(s) – see also Disease
    • rhythm, heart I49.9
  • Dysrhythmia
    • cardiac I49.9
  • Irregular, irregularity
    • action, heart I49.9
  • Rhythm
    • disorder I49.9
    • escape I49.9
    • heart, abnormal I49.9
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