I48.91
Unspecified atrial fibrillation
Diseases of the circulatory system Billable
Quick Reference
Documented atrial fibrillation when type (paroxysmal, persistent, permanent) is not specified
Clinical Information
When to Use This Code
Documented atrial fibrillation when type (paroxysmal, persistent, permanent) is not specified
Common Clinical Scenarios
- New onset atrial fibrillation in emergency department
- Known AFib without documentation of specific type
- Chronic AFib management visits
Documentation Requirements
- Document EKG findings confirming irregular rhythm
- Specify type: paroxysmal, persistent, or permanent if known
- Record anticoagulation status and CHA2DS2-VASc score
- Note rate vs. rhythm control strategy
Coding Guidelines
Inclusion Terms
These terms are included in this code:
Atrial fibrillationAFibA-fibAuricular fibrillation
Exclusion Terms
Do NOT use this code for:
- Atrial flutter (I48.3-, I48.4-)
- Paroxysmal atrial fibrillation (I48.0)
- Persistent atrial fibrillation (I48.1-)
Coding Notes
Specify paroxysmal (I48.0), persistent (I48.1-), or permanent (I48.2-) when known
Code anticoagulation separately with Z79.01
Consider adding stroke risk codes for risk stratification
Related ICD-10 Codes
Consider these related codes based on patient presentation:
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Code
I48.91
Category
Diseases of the circulatory system
Billable Status
Billable
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