Cal. Health & Safety Code § 1367.7

On and after January 1, 1980, every health care service plan contract that covers hospital, medical, or surgical expenses on a group basis, and which offers maternity coverage in such groups, shall also offer coverage for prenatal diagnosis of genetic disorders of the fetus by means of diagnostic procedures in cases of high-risk pregnancy. Every health care service plan shall communicate the availability of such coverage to all group contract holders and to all groups with whom they are negotiating.