Atrial fibrillation
ICD-10-CM diagnosis code · also known as afib, a-fib
I48.91BillableUnspecified atrial fibrillationView code details →The ICD-10-CM code for atrial fibrillation is I48.91 — Unspecified atrial fibrillation. This code is billable for diagnosis and reimbursement.
What this means for your family
Atrial fibrillation is an irregular, often fast heartbeat that raises stroke risk. I48.91 is the unspecified form. It's common and manageable — the plan usually focuses on controlling the rhythm or rate and, importantly, preventing stroke.
Your first steps
- →Ask about your stroke risk and whether a blood thinner is recommended.
- →Get the medication plan in writing and learn how to check your pulse.
- →Confirm which symptoms mean call-the-doctor versus call-911.
Questions to ask your care team
- ?What's my stroke risk, and do I need a blood thinner?
- ?Are we controlling the rate, the rhythm, or both?
- ?Which symptoms are an emergency?
Sources: MedlinePlus (NIH/NLM)
For informational purposes only — not medical advice. Talk to your care team about your situation.
How Eleplan helps with atrial fibrillation
- Keep medications (especially blood thinners) and appointments in one plan — Ellie flags missed doses.
- Track symptoms and pulse so patterns are easy to share with cardiology.
- Care Monitoring keeps follow-ups and lab checks on schedule.
Frequently asked questions
What is the ICD-10 code for atrial fibrillation?
The ICD-10-CM code for atrial fibrillation is I48.91 (Unspecified atrial fibrillation).
Is I48.91 a billable code?
Yes — I48.91 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement.
What else is atrial fibrillation called?
Atrial fibrillation is also known as afib, a-fib.
Look up another condition or ICD-10 code