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Table 4. APRDRG severity index by class variable
Table of class by APRDRG_Severity
class
APRDRG_Severity(All Patient Refined DRG: Severity of Illness 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
614605
94.63
18.99
32569
5.01
1.24
1648
0.25
0.18
2
0.00
0.00
649478
3
343
0.04
9.00
776844
81.72
24.01
163713
17.22
6.22
9491
1.00
1.02
231
0.02
0.14
950622
4
353
0.04
9.27
563970
64.98
17.43
278324
32.07
10.57
24449
2.82
2.63
803
0.09
0.48
867899
5
295
0.04
7.74
420551
52.48
13.00
335343
41.84
12.74
43313
5.40
4.66
1925
0.24
1.14
801427
6
279
0.04
7.32
306483
41.18
9.47
364172
48.94
13.84
68382
9.19
7.36
4875
0.66
2.89
744191
7
212
0.03
5.56
210954
32.39
6.52
349317
53.63
13.27
84826
13.02
9.13
6023
0.92
3.58
651332
8
190
0.03
4.99
143002
24.73
4.42
320313
55.40
12.17
105725
18.28
11.38
8999
1.56
5.34
578229
9
198
0.04
5.20
95844
17.75
2.96
291390
53.96
11.07
136117
25.21
14.65
16443
3.05
9.76
539992
10
356
0.03
9.34
103579
8.74
3.20
496976
41.93
18.88
455191
38.40
48.99
129171
10.90
76.67
1185273
Total
3810
3235832
2632117
929142
168472
6969373
severity class 4 having all ten codes. To examine the three disease staging levels, we use Tables 5-7.
Here, too, patients have a higher probability of a higher category in length of stay as the number of
diagnosis codes changes from 1 to 10; 62% of the patients in level 5 have 10 codes.
While sicker patients will have more diagnosis codes, it is also true that those who are “gamed” will
have a higher number of codes. Moreover, if there is a strong relationship between the number of codes
and the level of severity, any hospital can start increasing the amount of coding in order to shift patients
into a higher category.
Table 8 gives the relationship between the Charlson Index and the number of diagnosis codes. The
triangular nature of the matrix in Table 8 shows that the Charlson Index increases as the number of
diagnosis codes increases.
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