Chronic atrial fibrillation, unspecified

This code signifies a long-standing, continuous form of atrial fibrillation where the specific type (e.g., paroxysmal, persistent, permanent) has not been documented by the provider. It indicates that the heart's upper chambers are quivering irregularly and rapidly, leading to inefficient blood pumping, and this condition has been ongoing for an extended period.

Apply this code when the medical record clearly states "chronic atrial fibrillation" without further specification of its pattern (e.g., paroxysmal, persistent, or permanent). Documentation supporting its use would include physician notes indicating a diagnosis of chronic AFib without additional detail, or when the duration of AFib is long-term but the specific subtype is not identified.

• Do not use this code if the documentation specifies "chronic persistent atrial fibrillation" (refer to the Excludes1 note).
• Ensure the provider's documentation explicitly uses "chronic" or implies a long-standing nature; otherwise, consider unspecified atrial fibrillation (I48.91).
• Always query the provider for further specificity (paroxysmal, persistent, or permanent) if not clearly documented, as more specific codes are available.