I48: Atrial fibrillation and flutter
Codes under I48 (Atrial fibrillation and flutter). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| I48.0 | Paroxysmal atrial fibrillation | ✓ |
| I48.0 | Paroxysmal atrial fibrillation | ✓ |
| I48.1 | Persistent atrial fibrillation | — |
| I48.1 | Persistent atrial fibrillation | — |
| I48.2 | Chronic atrial fibrillation | — |
| I48.2 | Chronic atrial fibrillation | — |
| I48.3 | Typical atrial flutter | ✓ |
| I48.3 | Typical atrial flutter | ✓ |
| I48.4 | Atypical atrial flutter | ✓ |
| I48.4 | Atypical atrial flutter | ✓ |
| I48.9 | Unspecified atrial fibrillation and atrial flutter | — |
| I48.9 | Unspecified atrial fibrillation and atrial flutter | — |
| I48.11 | Longstanding persistent atrial fibrillation | ✓ |
| I48.11 | Longstanding persistent atrial fibrillation | ✓ |
| I48.19 | Other persistent atrial fibrillation | ✓ |
| I48.19 | Other persistent atrial fibrillation | ✓ |
| I48.20 | Chronic atrial fibrillation, unspecified | ✓ |
| I48.20 | Chronic atrial fibrillation, unspecified | ✓ |
| I48.21 | Permanent atrial fibrillation | ✓ |
| I48.21 | Permanent atrial fibrillation | ✓ |
| I48.91 | Unspecified atrial fibrillation | ✓ |
| I48.91 | Unspecified atrial fibrillation | ✓ |
| I48.92 | Unspecified atrial flutter | ✓ |
| I48.92 | Unspecified atrial flutter | ✓ |
Frequently asked questions
What is ICD-10-CM code I48?
I48 is an ICD-10-CM category covering Atrial fibrillation and flutter. It contains 24 more specific diagnosis codes, 18 of which are billable.
Is I48 a billable code?
No — I48 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example I48.0 — Paroxysmal atrial fibrillation). 18 of the 24 codes under I48 are billable.
What codes fall under I48?
I48 includes I48.0, I48.0, I48.1, I48.1, I48.2, plus 19 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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