Upon the filing of a valid primary claim by an exhaustee, the department shall promptly make an extended duration award computation which shall set forth the maximum amount of extended duration benefits potentially payable during the extended duration period, the weekly benefit amount, and the expiration date of the extended duration period. The department shall promptly notify the exhaustee of the computation. He may, within 20 days after the mailing or personal service of the notice of computation, protest its accuracy. The 20-day period may be extended for good cause. The department shall consider any such protest and shall promptly notify the exhaustee of the recomputation or denial of recomputation. An appeal may be taken from a notice of denial of recomputation in the manner prescribed in Section 3655. The director shall be an interested party to any appeal.
“Good cause,” as used in this section, shall include, but not be limited to, mistake, inadvertence, surprise, or excusable neglect.