ICD-10-CM 2027
ICD-10 code for heart flutter
From the official ICD-10-CM alphabetic index entry “Flutter › heart”. Page updated September 29, 2026.
About coding heart flutter
The ICD-10-CM code for heart flutter is I49.89 (Other specified cardiac arrhythmias not elsewhere classified). The official index lists 6 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I49.89.
Within I49.8 (other specified cardiac arrhythmias), I49.89 is specifically for other specified cardiac arrhythmias not elsewhere classified. Related codes cover Brugada syndrome (I49.81) and ventricular bigeminy (I49.82).
Code first cardiac arrhythmia complicating: abortion or ectopic or molar pregnancy (O00-O07, O08.8) and obstetric surgery and procedures (O75.4).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific heart flutter codes (official index)
Common questions about heart flutter ICD-10 codes
What is the ICD-10 code for heart flutter?
- I49.89 — Other specified cardiac arrhythmias not elsewhere classified. More specific codes apply when the documentation supports them: I48.92, I48.4, I48.3, I48.4 and others below.
What is the ICD-10 code for atrial or auricular heart flutter?
- I48.92 — Unspecified atrial flutter.
What is the ICD-10 code for ventricular heart flutter?
- I49.02 — Ventricular flutter.
Is I49.89 billable?
- Yes. I49.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I49.89 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I49.89 as a principal diagnosis.
Is I49.89 a CC or MCC?
- No. I49.89 is neither a CC nor an MCC under MS-DRG v44.0.