I49.9

I49.9: Cardiac arrhythmia, unspecified

Billable / specific codeICD-10-CM

I49.9 is a billable, specific ICD-10-CM code for cardiac arrhythmia, unspecified. It is valid for submission on a claim.

Check I49.9 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Arrhythmia (cardiac) NOS

Excludes2 inherited from the categories above I49.9

Not part of this code, but both may be coded when both are present.

Written on I49: Other cardiac arrhythmias

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

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

I49.9 is named in 6 Medicare coverage policies: 6 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A56391Billing and Coding: Implantable Automatic Defibrillators
A56476Billing and Coding: Cardiac Radionuclide Imaging
A56602Billing and Coding: Cardiac Rhythm Device Evaluation
A57326Billing and Coding: Electrocardiograms

Alphabetic index entries that lead here

Arrhythmia(auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle)
Action, heart›disorder
Action, heart›irregular
Disorder›heart action
Disturbance›rhythm, heart
Dysrhythmia›cardiac
Irregular, irregularity›action, heart
Rhythm›disorder
Rhythm›escape
Rhythm›heart, abnormal

Code history

Unchanged in every release from FY2024 to FY2027.