Table 3.
Validation of the AF subtype cases identified using ICD codes against the prospective nurse-abstracted registry data at Mayo Clinic
| Code | Vocabulary | Term | Paroxysmal AF in registry | Persistent AF in registry | Total |
|---|---|---|---|---|---|
| 427.31 | ICD-9 | AF | 304 (41.6) | 427 (58.4) | 731 (100) |
| I48.0 | ICD-10 | Paroxysmal AF | 260 (52.4) | 236 (47.6) | 496 (100) |
| I48.1 | ICD-10 | Persistent AF | 52 (29.5) | 124 (70.5) | 176 (100) |
| I48.2 | ICD-10 | Chronic AF | 4 (19.0) | 17 (81.0) | 21 (100) |
| I48.91 | ICD-10 | Unspecified AF | 251 (41.8) | 349 (58.2) | 600 (100) |
Values are n (%). ICD-9 codes were used prior to October 2015 and ICD-10 codes thereafter.
AF: atrial fibrillation; ICD: International Classification of Diseases; ICD-9: International Classification of Diseases–Ninth Revision; ICD-10: International Classification of Diseases–Tenth Revision;