I48.9Header code — not billable
Unspecified atrial fibrillation and atrial flutter
- Chapter
- 9. Diseases of the circulatory system
- Category
- I48
- Effective date
- October 1, 2026
Related codes in category I48
I48Atrial fibrillation and flutterI48.0Paroxysmal atrial fibrillationYesI48.1Persistent atrial fibrillationI48.11Longstanding persistent atrial fibrillationYesI48.19Other persistent atrial fibrillationYesI48.2Chronic atrial fibrillationI48.20Chronic atrial fibrillation, unspecifiedYesI48.21Permanent atrial fibrillationYesI48.3Typical atrial flutterYesI48.4Atypical atrial flutterYesI48.91Unspecified atrial fibrillationYesI48.92Unspecified atrial flutterYes
Frequently asked questions
What is ICD-10 code I48.9?
I48.9 is an ICD-10-CM diagnosis code for Unspecified atrial fibrillation and atrial flutter.
Is I48.9 a billable code?
No. I48.9 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is I48.9 in?
I48.9 falls under Chapter 9: Diseases of the circulatory system.
When did I48.9 become effective?
I48.9 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to I48.9?
I48.9 belongs to category I48, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.