California Code, Insurance Code - INS § 10210.5

(a) If such policy covers the employees of more than one employer, the insurer may collect premium contributions from individual employers whose employees are insured or may assist the policyholder in making such collections. If the employees of more than 100 such employers are covered under such policy, it shall state as a separate part of the premium to be charged for the policy the amount to be charged by the insurer for such collection.

(b) If the policy covers a group of governmental employees and the governmental unit paying such employees will not transmit their premium contribution after pay roll deduction, the insurer may collect from the individual employees. If more than 100 such employees are covered under such policy, it shall state as a separate part of the premium to be charged for the policy the amount to be charged by the insurer for such collection.

(c) If individual members of the group make payment of their share of the premium contribution to the insurer without billing or solicitation by the insurer during a period of temporary absence from active work of not exceeding 90 days, such payment may be received without the necessity of any separately stated charge by the insurer.