Error When Attempting To Delete

I'm attempting to write some SQL to delete a record where it doesn't exist in one of three other tables. My SQL is below:

SELECT COUNT(*) FROM GAZETTEER_ADDRESSES
WHERE NOT EXISTS (
SELECT MEDICALS.*, REVIEWS.*, ADDRESS_HISTORIES.*
FROM MEDICALS INNER JOIN REVIEWS
ON MEDICALS.GADDRE_IDENTIFIER = REVIEWS.GADDRE_IDENTIFIER
JOIN ADDRESS_HISTORIES
ON REVIEWS.GADDRE_IDENTIFIER = ADDRESS_HISTORIES.GADDRE_IDENTIFIER
WHERE GAZETTEER_ADDRESSES.IDENTIFIER = MEDICALS.GADDRE_IDENTIFIER);

When I attempt to run this I receive the following error: ORA-00600: internal error code, arguments: [qcopcovm2], [0], [], [], [], [], [], []

I know it's not generally a good idea to delete records but in this case a large number of cases are incorrect and need to be reinserted and this is the quickest way of doing it.