Supplemental Digital Content Table 1. Post-operative complications and associated ICD-9CM diagnosis and procedure codes and CPT procedure codes.
Complication
Codes
Hemorrhage/Shock
ICD-9-CM Diagnosis Codes 285.1 458.29 998 998.01 998.11 998.12;
ICD-9-CM Procedure Codes 39.41 39.98 41.5;
CPT Code 38100
Vascular/Graft
ICD-9-CM Diagnosis Codes 996.1 996.6 996.61 996.62 996.63 996.74;
ICD-9-CM Procedure Codes 38.00 38.06 38.08 38.80 38.86 39.29 39.31 39.32 39.25 39.49
39.5 39.56 39.57 39.58 39.59 39.9 44.44 84.11 84.12 84.13 84.14 84.15 84.16 84.17;
CPT Codes 27590 27591 27592 27598 27880 27881 27882 27886 27888 27889 28800 28805
28810 28820 28825 34001 34111 34151 34201 34203 35221 35226 35236 35251 35256 35266
35281 35286 35302 35303 35304 35305 35331 35341 35351 35355 35361 35363 35371 35372
35533 35556 35558 35583 35656 35661 35700 35721 35741 35840 35870 35875 35876 35879
35881 35883 34884
Respiratory
ICD-9-CM Diagnosis Codes 465.9 466 481 482 482.1 482.2 482.3 482.31 482.32 482.39482.4
482.41 482.49 482.81 482.82 482.83 482.84 482.89 482.9 485 486 491.21 507 511.8 511.9 512.1
518 518.4 518.81 518.84 786.3 799.1 997.3;
ICD-9-CM Procedure Codes: 31.1 31.21 31.29 34.04 96.04;
CPT Codes 31600 31603 31605 32551
Cardiac
ICD-9-CM Diagnosis Codes 410 410.01 410.1 410.11 410.2 410.21 410.3 410.31 410.4 410.41
410.5 410.51 410.6 410.61 410.7 410.71 410.8 410.81 410.9 410.91 411 411.1 411.81 411.89 412
415 427.5 428.21 428.23 428.31 428.33 428.41 428.43 785.51 997.1
Renal/Urologic
ICD-9-CM Diagnosis Codes 584 585 591 599 788.2 788.29 996.64 996.65 997.5
Neurologic
ICD-9-CM Diagnosis Codes 293.9 430 431 434.11 434.91 436 437.1 780.09 780.39 997 997.01
997.02 997.09
Wound
ICD-9-CM Diagnosis Codes 998.13 998.3 998.30 998.31 998.32 998.5 998.51 998.59 998.83;
ICD-9-CM Procedure Codes 46.94 54.0 54.19 54.61 54.91 86.22;
CPT Codes 10060 10061 10120 10121 10140 10180 12020
12021 13160 45020 45562 45563 49020 49021 49040 49041 49060 49061 49080 49081 75989
97601 97602
Reoperation (Non-Vascular)
ICD-9-CM Diagnosis Codes 560.81 568;
ICD-9-CM Procedure Codes 44.61 45.71 45.72 45.73 45.74 45.75 45.76 45.79 45.80 46.71
46.73 46.75 46.79 48.71 50.61 51.91 53 53.1 53.2 53.3 53.5 53.6 54.1 54.11 54.12 54.21 54.51
54.59 54.92 55.81 56.75 56.82 56.86 56.89 57.81 57.83 57.84 58.41 69.41;
CPT Codes 44050 44110 44120 44140 44141 44143 44144 44155 44160 44207 44208 44210
44212 44602 44603 44604 44605 44850 49085 49002 49000 49010 49320 49323 50700 50760
50770 50900 50940 51860 51865
Venous Thromboembolism
ICD-9-CM Diagnosis Codes 415.1 415.11 415.12 415.19 453.2 453.3 453.4 453.8
Supplemental Digital Content Table 2. Univariate analysis of factors related to 30-day
readmission in 1502 Medicare beneficiaries who underwent EVAR. * mortality variables only
include deaths that occurred after discharge and exclude deaths that occurred during the index
(surgical) hospital stay. † Exact cell size suppressed per data use agreement to protect patient
confidentiality as n < 11.
Factor
Age
65-74
75-84
≥85
Gender
Female
Male
Race
White
Black
Other
Reason for Medicare entitlement
Age
Disability
End-stage renal disease
Medicaid enrollment
Charlson comorbidity score
1st tertile
2nd tertile
3rd tertile
Comorbid conditions (Elixhauser codes)
Paralysis
Other neurologic disease
Anemia
Congestive heart failure
Renal failure
Obesity
Coagulation disorder
History of cancer
Hypothyroidism
Diabetes mellitus
Chronic pulmonary disease
Valvular disease
Hypertension
Weight loss
Depression
Peripheral vascular disease
Fluid or electrolyte disorder
Other
Patient area of residence
Urban
Suburban
Large town
Small town or rural
Missing
# of Patients
with
Factor Present
% Readmitted
if Factor
Present
% Readmitted
if Factor
Absent
P
0.030
568
767
167
10.4
14.9
16.2
n/a
n/a
n/a
0.18
314
1188
15.6
12.7
n/a
n/a
1418
50
34
13.3
12.0
14.7
n/a
n/a
n/a
1346
156
0
114
13.8
9.0
0
14.0
n/a
n/a
n/a
13.3
802
333
367
10.4
14.1
19.1
n/a
n/a
n/a
28
95
329
314
155
47
99
280
175
375
616
386
1215
88
83
1454
212
313
17.9
15.8
20.1
18.2
20.0
14.9
19.2
16.8
16.6
17.1
15.1
14.3
13.3
19.3
14.5
13.2
18.9
15.3
13.2
13.2
11.4
12.0
12.6
13.3
12.9
12.5
12.9
12.1
12.1
13.0
13.2
12.9
13.3
16.7
12.4
12.8
917
141
219
218
14.6
15.6
10.5
9.2
14.3
n/a
n/a
n/a
n/a
n/a
0.94
0.092
†
0.81
<0.001
0.48
0.46
<0.001
0.005
0.010
0.75
0.075
0.058
0.18
0.014
0.090
0.53
0.97
0.088
0.75
0.49
0.010
0.24
0.15
Factor
Underwent procedure at high volume
hospital
Had in-hospital complication
Any complication
Wound
Reoperation (for non-vascular
complications)
Renal/urologic
Vascular/graft-related
Cardiac
Respiratory
Hemorrhage/shock
Neurologic
Venous thromboembolism
Prolonged length of stay (>4d)
Discharge destination
Home
Home with home care
Skilled nursing facility
Other facility
30-day mortality*
One-year mortality*
# of Patients
with
Factor Present
% Readmitted
if Factor
Present
% Readmitted
if Factor
Absent
P
704
14.5
12.3
0.21
318
20.4
37.5
11.4
13.2
<0.001
0.044
0
13.3
0.50
42
97
43
59
104
35
0
301
31.0
15.5
27.9
22.0
21.2
22.9
0
24.3
12.8
13.2
12.9
13.0
12.7
13.1
13.3
10.6
0.001
0.52
0.004
0.044
0.015
0.093
n/a
<0.001
<0.001
1214
171
79
38
11
106
10.5
20.5
35.4
23.7
72.7
47.2
n/a
n/a
n/a
n/a
12.9
10.7
†
†
<0.001
<0.001
Supplemental Digital Content Table 3. Univariate analysis of factors related to 30-day
readmission in 979 Medicare beneficiaries who underwent open AAA repair. * mortality
variables only include deaths that occurred after discharge and exclude deaths that occurred
during the index (surgical) hospital stay. † Exact cell size suppressed per data use agreement to
protect patient confidentiality as n < 11.
Factor
Age
65-74
75-84
≥85
Gender
Female
Male
Race
White
Black
Other
Reason for Medicare entitlement
Age
Disability
End-stage renal disease
Medicaid enrollment
Charlson comorbidity score
1st tertile
2nd tertile
3rd tertile
Comorbid conditions
Paralysis
Other neurologic disease
Anemia
Congestive heart failure
Renal failure
Obesity
Coagulation disorder
History of cancer
Hypothyroidism
Diabetes mellitus
Chronic pulmonary disease
Valvular disease
Hypertension
Weight loss
Depression
Peripheral vascular disease
Fluid or electrolyte disorder
Other
Patient area of residence
Urban
Large town
Small town
Suburban
Missing
# of Patients with
Factor Present
% Readmitted
if Present
% Readmitted
if Absent
439
479
61
11.9
12.9
18.0
n/a
n/a
n/a
280
699
15.4
11.7
n/a
n/a
922
33
24
12.7
15.2
12.5
n/a
n/a
n/a
879
98
79
12.6
14.3
0
11.4
n/a
n/a
n/a
12.9
570
235
174
10.7
13.6
18.4
n/a
n/a
n/a
16
55
180
127
75
33
39
148
122
190
407
244
767
55
55
926
109
181
37.5
25.5
16.7
18.9
13.3
21.2
12.8
15.5
16.4
12.1
14.5
14.3
13.3
9.1
14.6
12.5
12.8
12.7
12.4
12.0
11.9
11.9
12.7
12.5
12.8
12.3
12.3
12.9
11.5
12.2
10.9
13.0
12.7
17.0
12.8
12.8
570
143
145
115
12.6
12.6
13.1
13.9
0
n/a
n/a
n/a
n/a
n/a
P
0.39
0.12
0.92
0.78
†
†
0.70
0.026
0.003
0.004
0.083
0.027
0.88
0.14
0.99
0.27
0.20
0.76
0.17
0.40
0.34
0.40
0.68
0.35
0.98
0.98
0.90
Factor
Underwent procedure at high volume
hospital
Had in-hospital complication
Any complication
Wound
Reoperation (for non-vascular
complications)
Renal/urologic
Vascular/graft-related
Cardiac
Respiratory
Hemorrhage/shock
Neurologic
Venous thromboembolism
Prolonged length of stay (>11d)
Discharge destination
Home
Home with home care
Skilled nursing facility
Other facility
30-day mortality*
One-year mortality*
# of Patients with
Factor Present
% Readmitted
if Present
% Readmitted
if Absent
P
13.1
12.6
0.82
406
23
17
15.0
34.8
11.2
12.4
0.075
0.001
29.4
12.5
0.038
35
67
74
195
141
33
12
214
20.0
26.9
16.2
15.9
12.8
9.1
8.3
19.6
12.5
11.7
12.5
12.0
12.8
12.9
12.8
10.9
0.19
<0.001
0.36
0.14
0.99
0.52
0.64
0.001
<0.001
540
210
144
85
8.5
13.8
22.9
20.0
40.0
38.8
n/a
n/a
n/a
n/a
12.6
10.9
398
†
67
0.067
<0.001
Supplemental Digital Content Table 4. Multivariate analysis of predictors of 30-day
readmission after AAA repair, excluding prolonged LOS and discharge destination because of
multicollinearity with complications. * Denotes a statistically significant association at the
p<0.05 level.
Factor
Age
65-70
71-75
76-80
81-85
85+
Female (vs. Male)
Odds Ratio (95% CI)
2.06
1.72
2.11
2.22
Referent
(1.38 - 3.05) *
(1.15 - 2.55 *
(1.39 - 3.22) *
(1.29 - 3.82) *
1.27 (0.97 - 1.66)
Comorbid Conditions
Paralysis
Neurologic Disease
Anemia
Congestive Heart Failure
Renal Failure
History of Cancer
Chronic Pulmonary Disease
Fluid/Electrolyte Disorder
1.81 (0.82 - 3.97)
1.32 (0.84 - 2.08)
1.46 (1.10 - 1.94) *
1.40 (1.04 - 1.89) *
1.16 (0.79 - 1.70)
1.35 (1.00 - 1.82) *
1.15 (0.90 - 1.47)
1.04 (0.74 - 1.48)
Postoperative Complications
Wound
Renal/Urologic
Vascular/Graft
Cardiac
Respiratory
3.21 (1.35 - 7.66) *
1.97 (1.14 - 3.41) *
1.55 (1.02 - 2.36) *
1.47 (0.89 - 2.43)
1.14 (0.78 - 1.67)