2025 ICD-10-CM Diagnosis Code I49.40

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Unspecified premature depolarization

  • I49.40 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 I49.40 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of I49.40 – other international versions of ICD-10 I49.40 may differ.

Applicable To

  • Premature beats NOS

The following code(s) above I49.40 contain annotation back-references

 that may be applicable to I49.40:

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

Approximate Synonyms

  • Premature beats

Clinical Information

  • A group of cardiac arrhythmias in which the cardiac contractions are not initiated at the sinoatrial node. They include both atrial and ventricular premature beats, and are also known as extra or ectopic heartbeats. Their frequency is increased in heart diseases.

ICD-10-CM I49.40 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 I49.40 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 I49.40:

  • Beat(s)
    • premature I49.40
  • Depolarization, premature I49.40
  • Premature – see also condition
    • beats I49.40
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