2025 ICD-10-CM Diagnosis Code I49.5

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Sick sinus syndrome

  • I49.5 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 I49.5 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of I49.5 – other international versions of ICD-10 I49.5 may differ.

Applicable To

  • Tachycardia-bradycardia syndrome

The following code(s) above I49.5 contain annotation back-references

 that may be applicable to I49.5:

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

Approximate Synonyms

  • Bradycardia tachycardia syndrome
  • Sinus node dysfunction
  • Tachycardia-bradycardia

Clinical Information

  • A condition caused by dysfunctions related to the sinoatrial node including impulse generation (cardiac sinus arrest) and impulse conduction (sinoatrial exit block). It is characterized by persistent bradycardia, chronic atrial fibrillation, and failure to resume sinus rhythm following cardioversion. This syndrome can be congenital or acquired, particularly after surgical correction for heart defects.
  • A constellation of signs and symptoms which may include syncope, fatigue, dizziness, and alternating periods of bradycardia and atrial tachycardia, which is caused by sinoatrial node dysfunction.
  • A disorder characterized by a dysrhythmia with alternating periods of bradycardia and atrial tachycardia accompanied by syncope, fatigue and dizziness.

ICD-10-CM I49.5 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 I49.5 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 I49.5:

  • Bradycardia (sinoatrial) (sinus) (vagal) R00.1
    • tachycardia syndrome I49.5
  • Bradytachycardia I49.5
  • Dysfunction
    • sinoatrial node I49.5
  • Pause, sinoatrial I49.5
  • SickR69
    • sinus I49.5 (syndrome)
  • Syndrome – see also Disease
    • sick
      • sinus I49.5
    • bradycardia-tachycardia I49.5
    • tachycardia-bradycardia I49.5
  • TachycardiaR00.0
    • paroxysmal (sustained) (nonsustained) I47.9
      • with sinus bradycardia I49.5
    • sick sinus I49.5
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