Hello, I am using SAS 9.4 and I have a dataset with secondary diagnosis ICD10 codes. There are up to 120 secondary diagnosis codes listed. My goal is to build an array for the diagnosis codes and create a flag for any secondary diagnosis with a mention of alcohol. All the alcohol diagnosis codes start with an 'F10___' but depending on the specifics the code could be 3 more digits and there are too many ICD10 codes to just manually type out. I am trying to write a code to flag the observations with an alcohol related code associated to it by creating an array then doing a do loop that will select a partial string from the 120 variable array. I am not getting an error but my results come back as 0 observations which I know is incorrect based on spot checking one of the secondary code variables. Below is the code I am working with.    data cancer3; set cancer; array CDiagcode {1:120} DX1-DX120; *build array of DX codes;  do j = 1 to 120;                        if CDiagcode {j} = FIND(of CDiagcode{j}, 'F10') then do;    *if secondary diagnosis is for alcohol*;             substance10 = 1;             SFlag = 1;                     *flag 2;       end;       else if SFlag not in (1) then do; *if no alcohol diagnosis DM = 0;             substance10 = 0;             SFlag = 0;                     *flag 3;       end;  end; run; ... View more