I48
⚠ Non-billable
Atrial fibrillation and flutter
ICD-10-CM · FY2026 · Diseases of the Circulatory System
Code
I48
System
ICD-10-CM
Billable
No — use specific code
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 I48?
ICD-10-CM code I48 represents Atrial fibrillation and flutter. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Circulatory System chapter, effective October 1, 2025 – September 30, 2026.
Is I48 billable?
No. I48 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is I48 in?
I48 belongs to the Diseases of the Circulatory System chapter (I00–I99) of ICD-10-CM.
Related codes in the I48 category
I48.0
Paroxysmal atrial fibrillation
Billable
I48.1
Persistent atrial fibrillation
Non-billable
I48.2
Chronic atrial fibrillation
Non-billable
I48.3
Typical atrial flutter
Billable
I48.4
Atypical atrial flutter
Billable
I48.9
Unspecified atrial fibrillation and atrial flutter
Non-billable
I48.11
Longstanding persistent atrial fibrillation
Billable
I48.19
Other persistent atrial fibrillation
Billable
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