2025 ICD-10-CM Diagnosis Code I49.01

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Ventricular fibrillation

  • I49.01 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 I49.01 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of I49.01 – other international versions of ICD-10 I49.01 may differ.

The following code(s) above I49.01 contain annotation back-references

 that may be applicable to I49.01:

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

Clinical Information

  • A cardiac rhythm characterized by rapid, usually more than 300 bpm (cycle length: 180 ms or less), grossly irregular ventricular rhythm with marked variability in qrs cycle length, morphology, and amplitude.
  • A disorder characterized by a dysrhythmia without discernible qrs complexes due to rapid repetitive excitation of myocardial fibers without coordinated contraction of the ventricles.
  • A potentially lethal cardiac arrhythmia that is characterized by uncoordinated extremely rapid firing of electrical impulses (400-600/min) in heart ventricles. Such asynchronous ventricular quivering or fibrillation prevents any effective cardiac output and results in unconsciousness (syncope). It is one of the major electrocardiographic patterns seen with cardiac arrest.
  • An arrhythmia characterized by an irregular pattern of high or low-amplitude waves that cannot be differentiated into qrs complexes or t waves. These electrocardiographic waves occur as a result of fibrillary contractions of the ventricular muscle due to rapid repetitive excitation of myocardial fibers without coordinated contraction of the ventricle.
  • Arrhythmia characterized by fibrillary contractions of the ventricular muscle due to rapid repetitive excitation of myocardial fibers without coordinated contraction of the ventricle.

ICD-10-CM I49.01 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
  • 791 Prematurity with major problems
  • 793 Full term neonate with major problems

Convert I49.01 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 I49.01:

  • Fibrillation
    • ventricular I49.01
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