Online Appendix for the following JACC article
TITLE: Procedural Complications, Rehospitalizations, and Repeat Procedures After Catheter
Ablation for Atrial Fibrillation
AUTHORS: Rashmee U. Shah, MD, MS, James V. Freeman, MD, MPH, David Shilane, PhD,
Paul J. Wang, MD, Alan S. Go, MD, Mark A. Hlatky, MD
Table A1. International Classification of Disease, Version 9 (ICD-9) Codes Used for Atrial
Fibrillation Ablation Case Identification
Inclusion Criteria1
ICD-9 Codes
2
Atrial fibrillation (primary position)
427.31
Ablation of heart tissue via a peripherally inserted
37.34
2
catheter (any position)
Exclusion Criteria3
ICD-9 Codes
Supraventricular tachycardia
427.0
Ventricular tachycardia
427.1
Atrial flutter2
427.32
Other premature beats
427.69
Cardiac dysrhythmia
427.89
Wolf-Parkinson-White
426.7
Lown-Ganong-Levine
426.81
Atrioventricular nodal tachycardia
426.89
Pacemaker implantation
00.50, 00.52, 00.53, 37.71 to 37.79,
37.81 to 37.89
Implantable cardioverter defibrillator implantation
37.94 to 37.98, 00.51, 00.54
Open surgical ablation
37.33
1
Both codes had to have been presented for inclusion as an atrial fibrillation case
These codes were also used to identify recurrent arrhythmias. Atrial fibrillation or atrial flutter codes had to be in
the primary position and the ablation procedure code could be in any position during subsequent admissions.
3
Cases were excluded if any of the listed codes appeared in any secondary position
2
Table A2. International Classification of Disease, Version 9 (ICD-9) Codes Used for CoMorbidity Identification
Co-Morbidities ICD-9 Codes
Comments
Coronary Artery 410.xx, 411.0,
411, 412, 413 and, and V codes were included from
Disease
411.1, 411.8,
the index hospitalization if indicated as present on
411.89, 412, 413.x, admission; 410 codes were included if present as the
414.xx, V458.2
primary diagnosis in the year prior to the index
hospitalization.
Heart Failure
428.xx
428 codes were included from the index admission if
indicated as present on admission or if present as the
primary diagnosis for a hospitalization in the year
prior to index hospitalization.
Cerebrovascular 346.xx, 430, 431,
All listed codes were included from index
Disease
432.x, 433.xx,
hospitalization if indicated as present on admission;
434.xx, 435.x,
346, 430, 431, 433.x1, 432, and 434 codes were
438.xx
included if present as the primary diagnosis in the
year prior to the index hospitalization.
Chronic Renal
585.x, V420, V451, All listed codes were included from the index
Failure
V451.1, V451.2,
admission if indicated as present on admission or if
V560, V561, V562, they were in any diagnostic during a hospitalization in
V563.1, V563.2,
the year prior to index hospitalization.
V568
Lung Disease
491.2x, 491.8,
All listed codes were included from the index
491.9, 492.0, 492.8, admission if indicated as present on admission or if
493.xx, 494, 494.0, they were in any diagnostic during a hospitalization in
494.1, 496
the year prior to index hospitalization.
Hypertension
401.x, 402.xx,
All listed codes were included from the index
403.xx, 404.xx,
admission if indicated as present on admission or if
405.xx, 437.2
they were in any diagnostic during a hospitalization in
the year prior to index hospitalization.
Diabetes Mellitus 249.xx, 250.xx,
All listed codes were included from the index
790.xx, 791.5,
admission if indicated as present on admission or if
791.6, V458.5,
they were in any diagnostic during a hospitalization in
V539.1, V654.6
the year prior to index hospitalization.
Valvular Heart
394.x, 395.x, 39.x,
All listed codes were included from the index
Disease
397.0, 397.1, 424.0 admission if indicated as present on admission or if
to 242.3, V422,
they were in any diagnostic during a hospitalization in
V433
the year prior to index hospitalization.
Table A3. International Classification of Disease, Version 9 (ICD-9) Codes Used for Outcome
Identification
Procedural Complications1
ICD-9 Codes
Perforation or tamponade
370, 423.0, 423.3, 423.9
Pneumothorax or hemothorax
34.04, 512.0, 512.1, 511.8, 512.8
Central nervous system
997, 997.01, 997.02
complication
Transient ischemic attack
435.8
Any vascular complication
998.11, 998.12, 998.2, 39.31, 39.41, 39.49, 395.52, 39.53, 39.56 to
39.59, 39.79
Hematoma or hemorrhage only 998.11, 998.12
Re-Hospitalizations2, 3
ICD-9 Codes
Atrial fibrillation or flutter
427.31, 427.32
Stroke
346.60, 346.61, 346.62, 346.63, 430, 431, 432.0, 432.1, 432.9,
433.01, 433.11, 433.21, 433.31, 433.81, 433.91, 434.0, 434.00,
434.01, 434.1, 434.10, 434.11, 434.9, 434.90, 434.91, 436
1
Complications were assigned if any of the listed codes appeared in any secondary position
Re-hospitalizations were assigned cause-specific reasons if any of the listed codes appeared in the primary
diagnostic position
3
30-day re-hospitalizations also included procedural complications, as listed, plus all strokes
2