I49.9
✓ Billable
Cardiac arrhythmia, unspecified
ICD-10-CM · FY2026 · Diseases of the Circulatory System
Code
I49.9
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Circulatory System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code I49.9?
ICD-10-CM code I49.9 represents Cardiac arrhythmia, unspecified. It is a billable diagnosis code in the Diseases of the Circulatory System chapter, effective October 1, 2025 – September 30, 2026.
Is I49.9 billable?
Yes. I49.9 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is I49.9 in?
I49.9 belongs to the Diseases of the Circulatory System chapter (I00–I99) of ICD-10-CM.
Related codes in the I49 category
I49
Other cardiac arrhythmias
Non-billable
I49.0
Ventricular fibrillation and flutter
Non-billable
I49.1
Atrial premature depolarization
Billable
I49.2
Junctional premature depolarization
Billable
I49.3
Ventricular premature depolarization
Billable
I49.4
Other and unspecified premature depolarization
Non-billable
I49.5
Sick sinus syndrome
Billable
I49.8
Other specified cardiac arrhythmias
Billable
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