Dr. Langer determined that Frieda has chronic persistent atrial fibrillation. Based on previous testing, he is recommending a catheter ablation, to destroy the abnormal tissue that appears to be the cause of her fibrillation. He discusses the pros and cons of the procedure, answers her questions, and has her sign the informed consent form. Report the purpose of this encounter with:
A. I48.20Chronic atrial fibrillation, unspecified
B. I48.91Unspecified atrial fibrillation
C. I48.19Other persistent atrial fibrillation (Chronic persistent atrial fibrillation)
D. I48.11Longstanding persistent atrial fibrillation