Is ICD-10-CM code I49.89 billable?

Yes, I49.89 (Other specified cardiac arrhythmias not elsewhere classified) is a billable ICD-10-CM diagnosis code, valid for reimbursement on HIPAA-covered transactions for FY2027.

What chapter does ICD-10-CM code I49.89 belong to?

I49.89 belongs to Chapter 9 of the ICD-10-CM tabular list: I00–I99 (Diseases of the Circulatory System).

Is I49.89 a new ICD-10-CM code for 2027?

Yes, I49.89 was added or revised in the FY2027 ICD-10-CM update, effective October 1, 2026, as published by the Centers for Medicare and Medicaid Services (CMS).

I49.89Billable, valid for claims from October 1, 2026New for FY2027

Other specified cardiac arrhythmias not elsewhere classified

Under I49.8 Other specified cardiac arrhythmias, in Other forms of heart disease (I30-I5A), chapter 9: Diseases of the Circulatory System

I49.89 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under I49.8 below.
As a secondary diagnosis it is not a CC or MCC, so it doesn't raise the MS-DRG payment.

Also indexed as: Arrhythmia, sinus; Arrhythmia, specified NEC; Bradyarrhythmia; Fibrillation, cardiac; Fibrillation, heart; Flutter, heart; Incompetency, chronotropic, with, sinus node dysfunction; Nodal rhythm; Rhythm, atrioventricular nodal; Rhythm, disorder, coronary sinus; Rhythm, disorder, ectopic; Rhythm, disorder, nodal; Rhythm, nodal; Sinus, arrhythmia; Wandering, pacemaker

Instructional notes

Includes: conditions that are coded here

Coronary sinus rhythm disorder
Ectopic rhythm disorder
Nodal rhythm disorder

Also applies, from I49: Other cardiac arrhythmias

These notes sit on I49 and apply to every code under it, including I49.89.

Excludes2: not included here, code separately if applicable

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

Code first: code the underlying condition first, then this code

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

Other codes under I49.8

Other specified cardiac arrhythmias

I49.81Brugada syndrome
I49.82Ventricular bigeminy
I49.89Other specified cardiac arrhythmias not elsewhere classified(this code)

MS-DRGs

As the principal diagnosis, this code groups to these MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Arrhythmia

An arrhythmia is a problem with the rate or rhythm of your heartbeat. Your heart beats too quickly, too slowly, or with an irregular pattern. Changes in the electrical signals that control your heartbeat cause arrhythmias.

Code history

Added in FY2027 (effective October 1, 2026). Before that, these cases were coded as I49.8 (Other specified cardiac arrhythmias). No changes since.