Cal. INS § 10707

Except in the case of a late enrollee, or for satisfaction of a preexisting condition clause in the case of initial coverage of an eligible employee, a carrier may not exclude any eligible employee or dependent who would otherwise be covered, on the basis of an actual or expected health condition of that employee or dependent. No health benefit plan may limit or exclude coverage for a specific eligible employee or dependent by type of illness, treatment, medical condition, or accident, except for preexisting conditions as permitted by Section 10708.