I48 – Atrial fibrillation and flutter
ICD-10-CM 2027 diagnosis code · Other forms of heart disease
ICD-10-CM code
I48
- Code
I48(claims format:I48)- Description
- Atrial fibrillation and 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
Billable codes under I48
I48 is a header code and cannot be used on claims. Choose the most specific code:
- I48.0 – Paroxysmal atrial fibrillationBillable
- I48.1 – Persistent atrial fibrillationHeader (more codes below)
- I48.2 – Chronic atrial fibrillationHeader (more codes below)
- I48.3 – Typical atrial flutterBillable
- I48.4 – Atypical atrial flutterBillable
- I48.9 – Unspecified atrial fibrillation and atrial flutterHeader (more codes below)
Frequently asked questions
What is ICD-10 code I48?
I48 is the ICD-10-CM code for atrial fibrillation and flutter, in the block I30-I5A (Other forms of heart disease).
Is I48 a billable code?
No. I48 is a header code with more specific child codes; report one of the billable codes listed above.
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.