SQL & PL/SQL

I have a below pl/sql block that needs to flag a claim based on claim number values given that I have in an excel sheet. Is there a way to capture those 500 claims efficiently in the select statement in the pl/sql without hardcoding these from value 1 ...to value 500 (as listed below)???

DECLARE
   ln_ctr   NUMBER := 0;
BEGIN
   FOR lrecclaimnumber
   IN ( SELECT   entityid claimnumber
         FROM   mpi_fnx.wfTokenEntity wte
        WHERE   wte.entityid IN
                      ('Value1','Value2',....'Value 500')
)
LOOP
   mpi_fnx.pkgSaveClaimData.spMarkClaimInvalid (pivClaimNumber          => lrecclaimnumber.claimnumber,
                                                pininvalidreasonid      => 304,
                                                pinuserid               => 4999
                                               );
   ln_ctr := ln_ctr + 1;
   END LOOP;

   DBMS_OUTPUT.put_line ('Total Entries Processed: ' || ln_ctr);
END;
/