ICD-10 Code I48.1 – Persistent atrial fibrillation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I48.1 – Persistent atrial fibrillation
What it is
Persistent atrial fibrillation is an ongoing irregular heart rhythm that does not stop on its own. You use this code when the record specifically documents persistent AF.
Clinical signs
Common findings include an irregularly irregular pulse, palpitations, fatigue, dyspnea, or reduced exercise tolerance. Clinical features vary; refer to documentation.
When to use this code
Use I48.1 when the provider documents persistent atrial fibrillation, including cases that continue until cardioversion or other intervention. Apply it when the diagnosis is clearly stated in the assessment, problem list, or discharge summary. Check documentation if AF type is not specified.
Do not use for
Do not use this code for paroxysmal, chronic, or unspecified atrial fibrillation unless the record supports persistent AF. Do not assume the rhythm type from anticoagulation or rate-control treatment alone.
Coding tip
Code the exact AF subtype documented, and query the provider when the chart only says “atrial fibrillation.”