Cal. Elec. Code § 8022
Notwithstanding Section 8020 or any other provision of the law, if nomination documents for an incumbent state Senator, Member of the Assembly, state constitutional officer, Insurance Commissioner, Member of the United States House of Representatives, or United States Senator are not delivered by 5 p.m. on the 88th day before the direct primary election, any person other than the person who was the incumbent on the 88th day shall have until 5 p.m. on the 83rd day before the election to file nomination documents for the elective office.
However, if the incumbent's failure to file nomination documents is because he or she has already served the maximum number of terms permitted by the California Constitution for that office, there shall be no extension of the period for filing the nomination documents.
Ca. Elec. Code § 8022