I48.9 – Unspecified atrial fibrillation and atrial flutter
ICD-10-CM 2027 diagnosis code · Other forms of heart disease
ICD-10-CM code
I48.9
- Code
I48.9(claims format:I489)- Description
- Unspecified atrial fibrillation and atrial flutter
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 9. Diseases of the circulatory system (I00-I99)
- Block
- I30-I5A Other forms of heart disease
- Parent codes
- I48
Billable codes under I48.9
I48.9 is a header code and cannot be used on claims. Choose the most specific code:
Related codes in I48
Frequently asked questions
What is ICD-10 code I48.9?
I48.9 is the ICD-10-CM code for unspecified atrial fibrillation and atrial flutter, in the block I30-I5A (Other forms of heart disease).
Is I48.9 a billable code?
No. I48.9 is a header code with more specific child codes; report one of the billable codes listed above.
What category does I48.9 belong to?
It belongs to category I48 – Atrial fibrillation and flutter.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.