I49.89: Other specified cardiac arrhythmias not elsewhere classified

New code · FY2027

Billable: use this code on claims.

• New code, effective October 1, 2026 (FY2027). Before that, this condition was coded as I49.8.

Code breakdown

Coding notes

Inclusion terms

• Coronary sinus rhythm disorder
• Ectopic rhythm disorder
• Nodal rhythm disorder

Excludes2 (from I49)

• bradycardia NOS (R00.1)
• neonatal dysrhythmia (P29.1-)
• sinoatrial bradycardia (R00.1)
• sinus bradycardia (R00.1)
• vagal bradycardia (R00.1)

Code first (from I49)

• cardiac arrhythmia complicating:
• abortion or ectopic or molar pregnancy (O00-O07, O08.8)
• obstetric surgery and procedures (O75.4)

Medicare coverage

I49.89 is listed as a covered diagnosis in 16 Medicare billing and coding articles:

• A56476 Billing and Coding: Cardiac Radionuclide Imaging
• A56602 Billing and Coding: Cardiac Rhythm Device Evaluation
• A56625 Billing and Coding: Echocardiography
• A56691 Billing and Coding: Cardiac Computed Tomography & Angiography (CCTA)
• A56781 Billing and Coding: Transthoracic Echocardiography (TTE)
• A57183 Billing and Coding: Cardiovascular Stress Testing, Including Exercise and/or Pharmacological Stress and Stress Echocardiography
• A57189 Billing and Coding: Serum Magnesium
• A57326 Billing and Coding: Electrocardiograms
• A57361 Billing and Coding: Monitored Anesthesia Care
• A57476 Billing and Coding: Electrocardiographic (EKG or ECG) Monitoring (Holter or Real-Time Monitoring)

…and 6 more. Check the coverage tool for your CPT code.

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All FY2027 ICD-10-CM changes

ICD-10-CM codes and descriptions are from the CMS and NCHS code files. Coverage is from the CMS Medicare Coverage Database billing and coding articles.