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in the assignment of severity. Table 7 gives the listed codes that we will use when attempting to predict
the APRDRG index value.
We will combine codes 1 and 2 from Table 7. Because the diagnosis code is nominal, '250.00' and
'250' are identified as different values. Similarly, we combine 272.4, 272, and 272.0 because of similarity.
We will use the diagnoses in Table 7 to see if there is a relationship between the patient diagnoses and
the APRDRG index value. We first use a table analysis to compare the APRDRG index to the diagnosis
codes (Table 8). The SAS code to define these values is below:
Data work.aprdrgcodes;
Set nis.Charlson;
Code=0; code250=0; code272=0; code276=0; code585=0; code491=0 ; code486=0 ;
Code584=0 ; code599=0 ; code5308=0 ; code5939=0 ; code2859=0 ;
Code2449=0 ; code3051=0 ;
If ((rxmatch('250',diagnoses3digits)>0) then code250=1 ;
If ((rxmatch('272',diagnoses3digits)>0) then code272=1 ;
If ((rxmatch('276',diagnoses3digits)>0) then code276=1 ;
If ((rxmatch('585',diagnoses3digits)>0) then code585=1 ;
If ((rxmatch('491',diagnoses3digits)>0) then code491=1 ;
If ((rxmatch('486',diagnoses3digits)>0) then code486=1 ;
If ((rxmatch('584',diagnoses3digits)>0) then code584=1 ;
If ((rxmatch('599',diagnoses3digits)>0) then code599=1 ;
If ((rxmatch('5308',diagnoses4digits)>0) then code5308=1 ;
If ((rxmatch('5939',diagnoses4digits)>0) then code5939=1 ;
Table 7. Diagnosis codes used to predict the APRDRG level
Code
Number
Code
Frequency
Code
Number
Code
Frequency
1
250.00 (Diabetes mellitus without
mention of complication of unspeci-
fied type)
59,354
11
585 (Chronic kidney disease)
17,197
2
250 (Diabetes mellitus)
46,498
12
491 (Chronic bronchitis)
17,122
3
272.4 (Other and unspecified hy-
perlipidemia)
35,068
13
584.9 (Acute renal failure, unspeci-
fied)
15,977
4
276 (Disorders of fluid, electrolyte,
and acid-base balance)
32,577
14
530.81 (Esophageal reflux)
15,617
5
486 (Pneumonia, organism un-
specified)
31,253
15
272 (Hyperlipidemia)
14,674
6
593.9 (Unspecified disorder of
kidney and ureter)
23,561
16
491.21 (Acute exacerbation of chronic
obstructive pulmonary disease)
14,377
7
285.9 (Anemia, unspecified)
22,485
17
276.8 (Hypopotassemia)
13,866
8
244.9 (Unspecified hypothyroid-
ism)
22,402
18
584 (Acute renal failure)
13,346
9
599.0 (Urinary tract infection, site
not specified)
18,896
19
305.1 (Tobacco use disorder)
13,043
10
599 (Urinary tract infection)
17,505
20
272.0 (Pure hypercholesterolemia)
12,683
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