I used the invalue format you provided: proc format;
invalue FIPS
'23' '33' '50' '25' '44' '09' = 1
'36' '42' '34' = 2
'55' '26' '17' '18' '39' = 3
'29' '38' '46' '31' '20' '27' '19' = 4
'10' '24' '11' '51' '54' '37' '45' '13' '12' = 5
'21' '47' '28' '01' = 6
'40' '48' '05' '22' = 7
'16' '30' '56' '32' '49' '08' '04' '35' = 8
'02' '53' '41' '06' '15' = 9
;
run;
data test2;
set test;
HOSP_DIVISION = input(substr(HOSPSTCO,1,2), FIPS.);
run;
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