ICD-10 Code I48.2 – Chronic atrial fibrillation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I48.2 – Chronic atrial fibrillation
What it is
Chronic atrial fibrillation is a long-standing irregular heart rhythm that originates in the atria. Use this code when the record documents persistent or chronic atrial fibrillation.
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 I48.2 when the provider clearly documents chronic atrial fibrillation, including longstanding or persistent AF without a different specified type. It may be listed as an active diagnosis in outpatient or inpatient records. Confirm the note does not instead describe paroxysmal, persistent, or permanent atrial fibrillation.
Do not use for
Do not use this code for atrial flutter or for atrial fibrillation with a more specific documented type if another code is assigned. Check documentation if the rhythm is only suspected or not confirmed.
Coding tip
Match the code to the exact AF wording in the provider note, and do not infer chronicity from history alone.