Using "*" to keep all codes in a dataset after a certain number

[Jake Magel]

I am trying to keep all ICD9 codes after the first 2 numbers 73

I have tried keep if Principal_Dx_ID == 73*

I get the error of invalid name 73*

I know there is a simple solution but I am not coming up with it.

* Example generated by -dataex-. To install: ssc install dataex
clear
input long(Unique_Person_Id Principal_Dx_ID)
22107 727
11547 727
11547 727
18801 734
14711 734
16926 734
38215 734
1005 734
3542 734
42237 734
29534 734
11258 734
11258 734
30847 734
6674 734
50650 734
36606 734
32881 734
28094 734
18801 734
9965 734
1005 734
22103 734
13253 734
8251 734
15565 734
25266 734
40082 734
12456 734
50803 734
18054 734
38910 734
42670 734
32535 734
32535 734
50406 734
20141 734
20141 734
37004 734
19427 734
36814 734
21264 734
10983 734
6674 734
30847 734
27419 734
48260 734
16511 734
40082 734
37719 734
49510 734
49048 734
36814 734
32535 734
42708 734
12578 734
37266 734
32881 734
24557 734
34049 734
32535 734
39353 734
3542 734
13572 734
37404 734
36814 734
21268 734
26426 734
11167 734
9957 734
48412 734
40082 734
4085 734
6906 734
13253 734
1277 734
29534 734
34107 734
23965 734
51102 734
8376 734
10816 734
49027 734
14711 734
24557 734
36606 734
22832 734
10816 734
48412 734
25553 734
49626 735
624 736
393 736
16232 736
20027 736
43290 736
30737 736
30849 736
14881 736
49729 736
end
[/CODE]
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[Marcos Almeida]

If I understood right, you may use the command - icd9 gen - or - icd10 gen - depending on the data, with - range() - function as the option.

[Pablo Bonilla]

Hey Jake,

see if this works

keep if regexm(strofreal(Principal_Dx_ID), "^73")