Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_27988281_1 ( production_code INTEGER, written_by VARCHAR )

### Question ###
What is the production code of the episode written by Jeff Filgo?

### Accurate SQL ###

SELECT MAX(production_code) FROM table_27988281_1 WHERE written_by = "Jeff Filgo"