Cal. Ins. Code § 10753.06
Every carrier shall file with the commissioner the reasonable participation requirements and employer contribution requirements that are to be included in its health benefit plans. Participation requirements shall be applied uniformly among all small employer groups, except that a carrier may vary application of minimum employer participation requirements by the size of the small employer group and whether the employer contributes 100 percent of the eligible employee's premium. Employer contribution requirements shall not vary by employer size. A carrier shall not establish a participation requirement that (1) requires a person who meets the definition of a dependent in subdivision (e) of Section 10753 to enroll as a dependent if he or she is otherwise eligible for coverage and wishes to enroll as an eligible employee and (2) allows a carrier to reject an otherwise eligible small employer because of the number of persons that waive coverage due to coverage through another employer. Members of an association eligible for health coverage eligible under subdivision (s) of Section 10753 but not electing any health coverage through the association shall not be counted as eligible employees for purposes of determining whether the guaranteed association meets a carrier's reasonable participation standards.
Ca. Ins. Code § 10753.06