Imaging Use and VTE Event Rates – supplemental tables
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SUPPLEMENTAL TABLES
Supplemental table 1: 11 procedures as identified by International Classification of Diseases, Ninth Revision
[ICD-9] codes and American Medical Association Current Procedural Terminology [CPT] codes.
Surgery type
ICD-9 codes
CPT codes
Colon resection
17.3, 17.31, 17.32, 17.33,
17.34, 17.35, 17.36, 17.39,
45.7, 45.71, 45.72, 45.73,
45.74, 45.75, 45.76, 45.79,
45.8, 45.81, 45.82, 45.83
44025, 44139, 44140, 44141, 44143, 44144, 44145,
44146, 44147, 44150, 44151, 44160, 44180, 44187,
44188, 44204, 44205, 44206, 44207, 44208, 44210,
44213, 44227, 44238, 44310, 44312, 44314, 44316,
44320, 44322, 44340, 44345, 44346, 44604, 44605,
44620, 44625, 44626, 44660, 44661, 44680, 44700,
44799, 45805, 45825
Bariatric surgery
44.31, 44.38, 44.39; 278.01,
278.00, 289.0, 278.1, 278.8
43644, 43645, 43770, 43771, 43772, 43773, 43774,
43775, 43842, 43843, 43845, 43846, 43847, 43848,
43886, 43887, 43888
Rectal surgery
48.4, 48.40, 48.41, 48.42,
48.43, 48.49, 48.5, 48.50,
48.51, 48.52, 48.59, 48.6,
48.61, 48.62, 48.63, 48.64,
48.65, 48.69
0184T, 44155, 44156, 44157, 44158, 44211, 44212,
45000, 45005, 45020, 45108, 45110, 45111, 45112,
45113, 45114, 45116, 45119, 45120, 45121, 45123,
45126, 45130, 45135, 45136, 45150, 45160, 45170,
45190, 45395, 45397, 45400, 45402, 45499, 45505,
45540, 45541, 45550, 45560, 45800, 45820, 45905,
45910, 45999, 46040, 46045, 46060, 46700, 46706,
46710, 46712, 46715, 46740, 46744, 46750, 46753,
46760, 46761, 46762, 46940, 46942, 46947, 46999
Total knee
reconstruction
arthroplasty
Abdominal aortic
aneurysm repair
81.54, 81.55
27440, 27441, 27442, 27443, 27445, 27446, 27447,
27486, 27487
38.34, 38.44, 38.64, 39.25,
39.71; 441.4, 441.9
34800, 34802, 34803, 34804, 34805, 34825, 34830,
34831, 34832, 35081, 35082, 35091, 35092, 35102,
35103
Esophagectomy
42.4, 42.40, 42.41, 42.42,
43.99
39502, 43030, 43045, 43100, 43101, 43107, 43108,
43112, 43113, 43116, 43117, 43118, 43121, 43122,
43123, 43124, 43130, 43135, 43279, 43280, 43281,
43282, 43289, 43300, 43305, 43310, 43312, 43313,
43320, 43324, 43325, 43326, 43330, 43331, 43340,
43341, 43351, 43352, 43360, 43361, 43405, 43410,
43415, 43420, 43425, 43496
Pancreatectomy
52.5, 52.51, 52.52, 52.53,
52.59, 52.6, 52.7
48000, 48100, 48105, 48120, 48140, 48145, 48146,
48148, 48150, 48152, 48153, 48154, 48155, 48160,
48500, 48510, 48511, 48520, 48540, 48545, 48547,
48548, 48999
Coronary artery
bypass graft
[CABG]
36.10, 36.11, 36.12, 36.13,
36.14, 36.15, 36.16, 36.17,
36.19
33508, 33510, 33511, 33512, 33513, 33514, 33516,
33517, 33518, 33519, 33521, 33522, 33523, 33530,
33533, 33534, 33535, 33536, 33572, 4110F
Imaging Use and VTE Event Rates – supplemental tables
Lung resection
Brain tumor
resection
Cystectomy
3
4
32.3, 32.30, 32.39, 32.4,
32.41, 32.49, 32.5, 32.50,
32.59, 32.1x, 32.29 32.3x,
32.5x, 32.4x
01.51, 01.59, 01.6, 04.01,
07.59, 07.61, 07.62 07.63,
07.64, 07.65, 07.68, 07.69,
38.31, 38.32, 38.41, 38.81,
38.82, 39.28, 01.21, 01.23,
01.24, 01.25, 01.31, 01.32,
01.39
57.6, 57.7, 57.71, 57.79
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32440, 32442, 32445, 32480, 32482, 32484, 32486,
32488, 32491, 32503, 32504, 32663
61510, 61512, 61518, 61519, 61520, 61521, 61526,
61530, 61545, 61546
51550, 51555, 51565, 51570, 51575, 51580, 51585,
51590, 51595, 51596, 51597
Imaging Use and VTE Event Rates – supplemental tables
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Supplemental table 2: DVT/PE/VTE imaging identified using the Healthcare Common Procedure
Coding System [HCPCS] codes in the Inpatient and Outpatient Revenue Center and Carrier Line Item
files and the ICD-9-CM procedure codes.
Imaging study
DVT imaging
Venous duplex
PE imaging
Chest CT
Chest MRI
Ventilation-Perfusion scan
Venogram
VTE imaging
any of above
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HCPCS codes
ICD-9-CM procedure codes
93970, 93971
8877
71260, 71250, 71270, 71275
71550, 71551,l 71552, 71555
78585, 78584, 78580,l 78599, 78598,
78597, 78582
75741, 75743, 75746, 75820, 75822,
78445, 78456, 78457, 78458
8843
any of above
any of above
9215
8866
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Supplemental table 3: (A) DVT event rates captured at 30-days and while inpatient only examined across DVT
imaging use rate quartiles. (B) PE event rates captured at 30-days and while inpatient only examined across PE
imaging use rate quartiles.
P-value
(A)
DVT imaging use rate quartiles
for
trend
Quartile 1
Quartile 2
Quartile 3
Quartile 4
(Cuzick
extension
Number of hospitals
52
52
52
52
of
Wilcoxon)
DVT imaging use rate
Mean
Standard deviation
7.29% *
0.84%
12.09%
2.90%
<0.001
1.07%
0.73%
1.49%
0.98%
0.003
0.81% *
1.19%
0.64%
1.54%
Inpatient only events
1.04%
0.68%
1.35%
0.76%
0.003
0.49% *
0.52%
0.84%
1.64%
0.67%
0.58%
1.09%
0.78%
<0.001
0.48%
0.46%
0.96%
1.86%
0.62%
0.48%
1.00%
0.66%
<0.001
3.22% *
1.11%
5.20% *
0.52%
30-days events
Observed DVT event rate
Mean
Standard deviation
Risk-adjusted DVT event rate
Mean
Standard deviation
0.82% *
0.71%
1.15%
1.64%
Observed DVT event rate
Mean
Standard deviation
Risk-adjusted DVT event rate
Mean
Standard deviation
(B)
Quartile 1
Number of hospitals
52
PE imaging use rate quartiles
Quartile 2
Quartile 3
52
Quartile 4
P-value
for trend
(Cuzick
extension
of
Wilcoxon)
52
52
4.69% *
0.44%
7.00%
1.51%
<0.001
0.69%
0.43%
0.78%
0.73%
<0.001
0.68%
0.40%
0.70%
0.62%
<0.001
0.42%
0.36%
0.53%
0.65%
<0.001
PE imaging use rate
Mean
Standard deviation
2.18% *
0.68%
3.55% *
0.36%
30-days events
Observed PE event rate
Mean
Standard deviation
Risk-adjusted PE event rate
Mean
Standard deviation
0.43% *
0.45%
0.46% *
0.38%
0.41% *
0.45% *
0.35%
0.35%
Inpatient only events
Observed PE event rate
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11
Mean
0.22% *
0.27% *
Standard deviation
0.36%
0.31%
Risk-adjusted PE event rate
Mean
0.21% *
0.26%
Standard deviation
0.23%
0.28%
* P <0.05, 2-tailed test for difference in means compared with VTE
Bonferroni correction for multiple pairwise comparisons.
0.002
0.42%
0.45%
0.35%
0.53%
imaging use rate quartile 4 mean after
Imaging Use and VTE Event Rates – supplemental tables
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Supplemental table 4: (A) Multivariable linear regression of risk-adjusted rates showing the association between
DVT imaging rate quartiles and risk-adjusted DVT event rate captured at 30-days and while inpatient only. (B)
Multivariable linear regression of risk-adjusted rates showing the association between PE imaging rate quartiles
and risk-adjusted PE event rate captured at 30-days and while inpatient only.
(A)
Parameter
estimate
30-days events
Bed size >= 500
0.01968
COTH †
-0.00780
Other teaching ‡
-0.26565
Number of structure quality characteristics #
-0.00330
DVT imaging use rate quartile 2
0.42053
DVT imaging use rate quartile 3
0.26532
DVT imaging use rate quartile 4
0.60336
Inpatient only events
Bed size >= 500
-0.03568
COTH †
0.01864
Other teaching ‡
-0.31797
Number of structure quality characteristics #
-0.01445
DVT imaging use rate quartile 2
0.52339
DVT imaging use rate quartile 3
0.17624
DVT imaging use rate quartile 4
0.60179
Standard
error
P-value
0.16779
0.19058
0.21225
0.07188
0.19879
0.19880
0.20329
0.907
0.967
0.212
0.963
0.036
0.184
0.003
0.17858
0.20283
0.22590
0.07650
0.21157
0.21159
0.21637
0.842
0.927
0.161
0.850
0.014
0.406
0.006
Parameter
estimate
30-days events
Bed size >= 500
-0.04127
COTH †
0.00777
Other teaching ‡
-0.18165
Number of structure quality characteristics #
0.04760
PE imaging use rate quartile 2
0.02148
PE imaging use rate quartile 3
0.27428
PE imaging use rate quartile 4
0.27887
Inpatient only events
Bed size >= 500
-0.00416
COTH †
0.07741
Other teaching ‡
-0.08262
Number of structure quality characteristics #
-0.00959
PE imaging use rate quartile 2
0.04253
PE imaging use rate quartile 3
0.20075
PE imaging use rate quartile 4
0.23793
Standard
error
P-value
0.07653
0.08511
0.09464
0.03249
0.09139
0.09232
0.09163
0.590
0.927
0.056
0.145
0.815
0.003
0.003
0.06308
0.07015
0.07800
0.02678
0.07532
0.07609
0.07552
0.948
0.271
0.291
0.721
0.573
0.009
0.002
Hospital characteristics
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(B)
Hospital characteristics
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† COTH: member of Council of Teaching Hospitals and Health Systems of the Association of American Medical
Colleges [AAMC]
‡ Other teaching: residency training approval from Accreditation Council for Graduate Medical Education
[ACGME], or medical school affiliation with American Medical Association [AMA], or American Osteopathic
Association [AOA].
# Summation of structure quality characteristics from Joint Commission [JCAHO] accreditation, American
College of Surgeons [ACS] Commission on Cancer [CoC] accreditation, level I trauma center certification, burn
care service, and/or transplant service.