California Code, Insurance Code - INS § 10121.6

(a) No policy of group disability insurance or self-insured employee welfare benefit plan which provides hospital, medical, or surgical expense benefits for employees, insureds, or policyholders and their dependents shall exclude a dependent child from eligibility or benefits solely because the dependent child does not reside with the employee, insured, or policyholder.

(b) Each policy of group disability insurance or self-insured employee welfare benefit plan which provides hospital, medical, or surgical expense benefits for employees, insureds, or policyholders and their dependents shall enroll, upon application by the employer or group administrator, a dependent child of the noncustodial parent when that parent is the employee, insured, or policyholder at any time either the parent or the person having custody of the child as defined in Section 3751.5 of the Family Code, or the local child support agency makes an application for enrollment to the employer or group administrator when a court order for medical support exists. In the case of children who are eligible for medicaid, the State Department of Health Services may also make that application.