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Table 3. APRDRG mortality index by class variable
Table of class by APRDRG_Risk_Mortality
class
APRDRG_Risk_Mortality(All Patient Refined DRG: Risk of Mortality Subclass)
Total
Frequency
Row Pct
Col Pct
0
1
2
3
4
1
930
100.00
24.41
0
0.00
0.00
0
0.00
0.00
0
0.00
0.00
0
0.00
0.00
930
2
654
0.10
17.17
645843
99.44
12.84
2159
0.33
0.15
525
0.08
0.12
297
0.05
0.25
649478
3
343
0.04
9.00
929442
97.77
18.48
18951
1.99
1.36
1247
0.13
0.30
639
0.07
0.55
950622
4
353
0.04
9.27
812750
93.65
16.16
49930
5.75
3.57
3006
0.35
0.71
1860
0.21
1.59
867899
5
295
0.04
7.74
699659
87.30
13.91
91469
11.41
6.55
8014
1.00
1.90
1990
0.25
1.70
801427
6
279
0.04
7.32
580017
77.94
11.53
140953
18.94
10.09
19269
2.59
4.56
3673
0.49
3.13
744191
7
212
0.03
5.56
448453
68.85
8.92
170053
26.11
12.17
28312
4.35
6.70
4302
0.66
3.67
651332
8
190
0.03
4.99
337481
58.36
6.71
192737
33.33
13.80
41684
7.21
9.87
6137
1.06
5.23
578229
9
198
0.04
5.20
253043
46.86
5.03
215182
39.85
15.40
60843
11.27
14.41
10726
1.99
9.15
539992
10
356
0.03
9.34
322144
27.18
6.41
515706
43.51
36.91
259449
21.89
61.43
87618
7.39
74.73
1185273
Total
3810
5028832
1397140
422349
117242
6969373
if there is a shift to a more severe category as the number of diagnosis codes increases, independent of
the actual severity of the patient's condition.
An APRDRG code of 0 indicates that the patient cannot be classified. Note that 99% of all patients
with just one diagnosis code are in APRDRG code 1, regardless of the actual severity of that code. The
probability of APRDRG class 4 increases to a high of 7+% if the patient has all ten diagnosis codes,
regardless of what those codes represent. Similarly, the probability of codes 2,3, and 4 increase as the
number of diagnosis codes increases. In fact, 75% of all patients in APRDRG class 4 have ten codes
identified. While it might be assumed that patients with more codes are more severe, we will examine
this level in detail.
For the severity index, the trend is even more pronounced with the severity class 1 ranging from a
high of 94% for two diagnosis codes to a low of 9% for all ten diagnosis codes with 76% of all patients in
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