I48.91 – Unspecified atrial fibrillation
ICD-10-CM 2027 diagnosis code · Other forms of heart disease
ICD-10-CM code
I48.91
- Code
I48.91(claims format:I4891)- Description
- Unspecified atrial fibrillation
- Billable
- Yes – valid for HIPAA-covered transactions
- 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 › I48.9
Index terms for I48.91
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in I48.9
Frequently asked questions
What is ICD-10 code I48.91?
I48.91 is the ICD-10-CM code for unspecified atrial fibrillation, in the block I30-I5A (Other forms of heart disease).
Is I48.91 a billable code?
Yes. I48.91 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does I48.91 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.