You can get this much easier:
data all / view=all;
set
HypImpt.UTAH_VITALS_2010
HypImpt.UTAH_VITALS_2011
HypImpt.UTAH_VITALS_2012
HypImpt.UTAH_VITALS_2013
HypImpt.UTAH_VITALS_2014
;
run;
proc sort
data=all
out=Vitals_UT
;
by ssn apptdate;
run;
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