California Code, Insurance Code - INS § 10127.3

On and after January 1, 1985, every insurer issuing group disability insurance which covers hospital, medical, or surgical expenses shall offer coverage for expenses incurred as a result of treatment by holders of certificates under Section 4938 of the Business and Professions Code, under such terms and conditions as may be agreed upon between the group policyholder and the insurer.

An insurer is not required to offer the coverage provided by this section as part of any policy covering employees of a public entity.