I48.91
Unspecified atrial fibrillation
Atrial fibrillation (AFib) is a common supraventricular tachyarrhythmia characterized by rapid and uncoordinated electrical activity in the atria. This leads to an irregular and often rapid heart rate, causing ineffective atrial contraction. Code I48.91 is used when the clinical documentation does not specify the pattern of atrial fibrillation, such as paroxysmal, persistent, permanent, or chronic. AFib significantly increases the risk of thromboembolic events, most notably ischemic stroke, and can lead to cardiomyopathy or heart failure if left uncontrolled.
Clinical Symptoms
- Palpitations
- Shortness of breath (dyspnea)
- Fatigue or generalized weakness
- Lightheadedness or dizziness
- Chest pain (angina)
- Reduced exercise tolerance
- Syncope or near-syncope
Common Causes
- Hypertension
- Coronary artery disease
- Valvular heart disease (especially mitral valve)
- Hyperthyroidism
- Obstructive sleep apnea
- Congenital heart defects
- Chronic kidney disease
- Excessive alcohol or stimulant use
- Advanced age
Documentation & Coding Tips
Specify the pattern of atrial fibrillation whenever possible to avoid using the 'unspecified' code.
Example: Document if the AFib is paroxysmal (terminates within 7 days), persistent (lasts >7 days), or permanent.
Document any underlying cause or contributing factors like hypertensive heart disease.
Example: 'Atrial fibrillation secondary to acute hyperthyroidism.'
Note the use of long-term anticoagulation or antiplatelet therapy for risk management.
Example: Include Z79.01 (Long term use of anticoagulants) if applicable.