Supplemental Digital Content Table 1. Post-Operative Complications and Associated ICD-9-CM
Supplemental Digital Content Table 1. Post-operative complications and associated ICD-9-CM diagnosis and procedure codes and CPT procedure codes.
Complication / CodesHemorrhage/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 / # of Patients withFactor Present / % Readmitted if Factor Present / % Readmitted if Factor Absent / P
Age / 0.030
65-74 / 568 / 10.4 / n/a
75-84 / 767 / 14.9 / n/a
≥85 / 167 / 16.2 / n/a
Gender / 0.18
Female / 314 / 15.6 / n/a
Male / 1188 / 12.7 / n/a
Race / 0.94
White / 1418 / 13.3 / n/a
Black / 50 / 12.0 / n/a
Other / 34 / 14.7 / n/a
Reason for Medicare entitlement / 0.092
Age / 1346 / 13.8 / n/a
Disability / 156 / 9.0 / n/a
End-stage renal disease / 0 / 0 / n/a
Medicaid enrollment / 114 / 14.0 / 13.3 / 0.81
Charlson comorbidity score / <0.001
1st tertile / 802 / 10.4 / n/a
2nd tertile / 333 / 14.1 / n/a
3rd tertile / 367 / 19.1 / n/a
Comorbid conditions (Elixhauser codes)
Paralysis / 28 / 17.9 / 13.2 / 0.48
Other neurologic disease / 95 / 15.8 / 13.2 / 0.46
Anemia / 329 / 20.1 / 11.4 / <0.001
Congestive heart failure / 314 / 18.2 / 12.0 / 0.005
Renal failure / 155 / 20.0 / 12.6 / 0.010
Obesity / 47 / 14.9 / 13.3 / 0.75
Coagulation disorder / 99 / 19.2 / 12.9 / 0.075
History of cancer / 280 / 16.8 / 12.5 / 0.058
Hypothyroidism / 175 / 16.6 / 12.9 / 0.18
Diabetes mellitus / 375 / 17.1 / 12.1 / 0.014
Chronic pulmonary disease / 616 / 15.1 / 12.1 / 0.090
Valvular disease / 386 / 14.3 / 13.0 / 0.53
Hypertension / 1215 / 13.3 / 13.2 / 0.97
Weight loss / 88 / 19.3 / 12.9 / 0.088
Depression / 83 / 14.5 / 13.3 / 0.75
Peripheral vascular disease / 1454 / 13.2 / 16.7 / 0.49
Fluid or electrolyte disorder / 212 / 18.9 / 12.4 / 0.010
Other / 313 / 15.3 / 12.8 / 0.24
Patient area of residence / 0.15
Urban / 917 / 14.6 / n/a
Suburban / 141 / 15.6 / n/a
Large town / 219 / 10.5 / n/a
Small town or rural / 218 / 9.2 / n/a
Missing / † / 14.3 / n/a
Factor / # of Patients with
Factor Present / % Readmitted if Factor Present / % Readmitted if Factor Absent / P
Underwent procedure at high volume hospital / 704 / 14.5 / 12.3 / 0.21
Had in-hospital complication
Any complication / 318 / 20.4 / 11.4 / <0.001
Wound / † / 37.5 / 13.2 / 0.044
Reoperation (for non-vascular complications) / † / 0 / 13.3 / 0.50
Renal/urologic / 42 / 31.0 / 12.8 / 0.001
Vascular/graft-related / 97 / 15.5 / 13.2 / 0.52
Cardiac / 43 / 27.9 / 12.9 / 0.004
Respiratory / 59 / 22.0 / 13.0 / 0.044
Hemorrhage/shock / 104 / 21.2 / 12.7 / 0.015
Neurologic / 35 / 22.9 / 13.1 / 0.093
Venous thromboembolism / 0 / 0 / 13.3 / n/a
Prolonged length of stay (>4d) / 301 / 24.3 / 10.6 / <0.001
Discharge destination / <0.001
Home / 1214 / 10.5 / n/a
Home with home care / 171 / 20.5 / n/a
Skilled nursing facility / 79 / 35.4 / n/a
Other facility / 38 / 23.7 / n/a
30-day mortality* / 11 / 72.7 / 12.9 / <0.001
One-year mortality* / 106 / 47.2 / 10.7 / <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 / # of Patients withFactor Present / % Readmitted if Present / % Readmitted if Absent / P
Age / 0.39
65-74 / 439 / 11.9 / n/a
75-84 / 479 / 12.9 / n/a
≥85 / 61 / 18.0 / n/a
Gender / 0.12
Female / 280 / 15.4 / n/a
Male / 699 / 11.7 / n/a
Race / 0.92
White / 922 / 12.7 / n/a
Black / 33 / 15.2 / n/a
Other / 24 / 12.5 / n/a
Reason for Medicare entitlement / 0.78
Age / 879 / 12.6 / n/a
Disability / 98 / 14.3 / n/a
End-stage renal disease / † / 0 / n/a
Medicaid enrollment / 79 / 11.4 / 12.9 / 0.70
Charlson comorbidity score / 0.026
1st tertile / 570 / 10.7 / n/a
2nd tertile / 235 / 13.6 / n/a
3rd tertile / 174 / 18.4 / n/a
Comorbid conditions
Paralysis / 16 / 37.5 / 12.4 / 0.003
Other neurologic disease / 55 / 25.5 / 12.0 / 0.004
Anemia / 180 / 16.7 / 11.9 / 0.083
Congestive heart failure / 127 / 18.9 / 11.9 / 0.027
Renal failure / 75 / 13.3 / 12.7 / 0.88
Obesity / 33 / 21.2 / 12.5 / 0.14
Coagulation disorder / 39 / 12.8 / 12.8 / 0.99
History of cancer / 148 / 15.5 / 12.3 / 0.27
Hypothyroidism / 122 / 16.4 / 12.3 / 0.20
Diabetes mellitus / 190 / 12.1 / 12.9 / 0.76
Chronic pulmonary disease / 407 / 14.5 / 11.5 / 0.17
Valvular disease / 244 / 14.3 / 12.2 / 0.40
Hypertension / 767 / 13.3 / 10.9 / 0.34
Weight loss / 55 / 9.1 / 13.0 / 0.40
Depression / 55 / 14.6 / 12.7 / 0.68
Peripheral vascular disease / 926 / 12.5 / 17.0 / 0.35
Fluid or electrolyte disorder / 109 / 12.8 / 12.8 / 0.98
Other / 181 / 12.7 / 12.8 / 0.98
Patient area of residence / 0.90
Urban / 570 / 12.6 / n/a
Large town / 143 / 12.6 / n/a
Small town / 145 / 13.1 / n/a
Suburban / 115 / 13.9 / n/a
Missing / † / 0 / n/a
Factor / # of Patients with
Factor Present / % Readmitted if Present / % Readmitted if Absent / P
Underwent procedure at high volume hospital / 398 / 13.1 / 12.6 / 0.82
Had in-hospital complication
Any complication / 406 / 15.0 / 11.2 / 0.075
Wound / 23 / 34.8 / 12.4 / 0.001
Reoperation (for non-vascular complications) / 17 / 29.4 / 12.5 / 0.038
Renal/urologic / 35 / 20.0 / 12.5 / 0.19
Vascular/graft-related / 67 / 26.9 / 11.7 / <0.001
Cardiac / 74 / 16.2 / 12.5 / 0.36
Respiratory / 195 / 15.9 / 12.0 / 0.14
Hemorrhage/shock / 141 / 12.8 / 12.8 / 0.99
Neurologic / 33 / 9.1 / 12.9 / 0.52
Venous thromboembolism / 12 / 8.3 / 12.8 / 0.64
Prolonged length of stay (>11d) / 214 / 19.6 / 10.9 / 0.001
Discharge destination / <0.001
Home / 540 / 8.5 / n/a
Home with home care / 210 / 13.8 / n/a
Skilled nursing facility / 144 / 22.9 / n/a
Other facility / 85 / 20.0 / n/a
30-day mortality* / † / 40.0 / 12.6 / 0.067
One-year mortality* / 67 / 38.8 / 10.9 / <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 / Odds Ratio (95% CI)Age
65-70 / Referent
71-75 / 2.06 (1.38 - 3.05) *
76-80 / 1.72 (1.15 - 2.55 *
81-85 / 2.11 (1.39 - 3.22) *
85+ / 2.22 (1.29 - 3.82) *
Female (vs. Male) / 1.27 (0.97 - 1.66)
Comorbid Conditions
Paralysis / 1.81 (0.82 - 3.97)
Neurologic Disease / 1.32 (0.84 - 2.08)
Anemia / 1.46 (1.10 - 1.94) *
Congestive Heart Failure / 1.40 (1.04 - 1.89) *
Renal Failure / 1.16 (0.79 - 1.70)
History of Cancer / 1.35 (1.00 - 1.82) *
Chronic Pulmonary Disease / 1.15 (0.90 - 1.47)
Fluid/Electrolyte Disorder / 1.04 (0.74 - 1.48)
Postoperative Complications
Wound / 3.21 (1.35 - 7.66) *
Renal/Urologic / 1.97 (1.14 - 3.41) *
Vascular/Graft / 1.55 (1.02 - 2.36) *
Cardiac / 1.47 (0.89 - 2.43)
Respiratory / 1.14 (0.78 - 1.67)