Hi Shatti,
Please refer to SAP note #1696147 - "How to determine the list of Oracle patches or SAP Bundle Patches (SBP) that are installed in SAP system".
Also you can query from dba_registry_history
SQL> select * from dba_registry_history;
Please also note that Oracle PSUs don't change the Oracle release version/fifth digit. That is also described in Oracle Metalink document #861152.1.
Regards,
Bíborka