2025 ICD-10-CM Diagnosis Code I49.8

by

Other specified cardiac arrhythmias

  • I49.8 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 I49.8 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of I49.8 – other international versions of ICD-10 I49.8 may differ.

Applicable To

  • Brugada syndrome
  • Coronary sinus rhythm disorder
  • Ectopic rhythm disorder
  • Nodal rhythm disorder

The following code(s) above I49.8 contain annotation back-references

 that may be applicable to I49.8:

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

Approximate Synonyms

  • Atrioventricular (av) tachycardia (fast heart beat)
  • Atrioventricular junctional heart rhythm
  • Atrioventricular nodal re entrant tachycardia
  • Av junctional rhythm
  • Junctional escape beats
  • Postural orthostatic tachycardia syndrome
  • Re-entrant atrioventricular node tachycardia
  • Re-entrant atrioventricular tachycardia

Clinical Information

  • A derangement in the normal functioning of the sinoatrial node. Typically, sa node dysfunction is manifest as sinoatrial exit block or sinus arrest, but may present as an absolute or relative bradycardia in the presence of a stressor. It may be associated with bradycardia-tachycardia syndrome
  • A derangement in the normal functioning of the sinoatrial node. Typically, sa node dysfunction is manifest as sinoatrial exit block or sinus arrest, but may present as an absolute or relative bradycardia in the presence of a stressor. It may be associated with bradycardia-tachycardia syndrome.
  • An arrhythmia originating from within the atrioventricular node.

ICD-10-CM I49.8 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 I49.8 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 I49.8:

  • Arrhythmia (auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle) I49.9
    • sinus I49.8
    • specified NEC I49.8
  • Bradyarrhythmia, cardiac I49.8
  • Fibrillation
    • cardiac I49.8
    • heart I49.8
  • Flutter
    • heart I49.8
  • Incompetency, incompetent, incompetence
    • chronotropicI45.89
      • with
        • sinus node dysfunction I49.8
  • Nodal rhythm I49.8
  • Rhythm
    • disorderI49.9
      • coronary sinus I49.8
      • ectopic I49.8
      • nodal I49.8
    • atrioventricular nodal I49.8
    • nodal I49.8
  • Sinus – see also Fistula
    • arrhythmia I49.8
  • Syndrome – see also Disease
    • Brugada I49.8
  • Wandering
    • pacemaker I49.8 (heart)
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