California Code, Insurance Code - INS § 10123.14

On and after January 1, 1990, every self-insured employee welfare benefit plan containing hospital, medical, or surgical expense benefits or service benefits may provide coverage for the treatment of alcoholism, chemical dependency, or nicotine use under such terms and conditions as may be agreed upon between the self-insured welfare benefit plan and the member, where the treatment may take place in facilities licensed to provide alcoholism or chemical dependency services under Chapter 2 (commencing with Section 1250) of Division 2 of the Health and Safety Code.

Treatment for nicotine use may be subject to separate deductibles, copayments, and overall cost limitations as determined by the plan.