California Code, Health and Safety Code - HSC § 1358.1

Every health care service plan that offers any contract that primarily or solely supplements Medicare or that is advertised or represented as a supplement to Medicare, shall, in addition to complying with this chapter and rules of the director, comply with this article. The basic health care services required to be provided pursuant to Sections 1345 and 1367 shall not be included in Medicare supplement contracts subject to this article, to the extent that California is required to disallow coverage for these health care services under the federal Medicare supplement standardization requirements set forth in Section 1882 of the federal Social Security Act (42 U.S.C.A. Sec. 1395ss).