California Code, Health and Safety Code - HSC § 120255

(a) Any electronic tool used by a health officer, as defined by subdivision (a) of Section 2500 of Title 17 of the California Code of Regulations, for the purpose of reporting cases of communicable disease to the State Department of Public Health, as required by Sections 2500 and 2502 of Title 17 of the California Code of Regulations, shall include the capacity to collect and report data relating to sexual orientation and gender identity as reported pursuant to subdivision (b).

(b) In addition to the information required to be reported pursuant to Section 2500 of Title 17 of the California Code of Regulations, a health care provider, as defined by subdivision (a) of Section 2500 of Title 17 of the California Code of Regulations, that knows of or is in attendance on a case or suspected case of any of the diseases or conditions listed in subdivision (j) of Section 2500 of Title 17 of the California Code of Regulations shall report to the health officer for the jurisdiction in which the patient resides, the patient's sexual orientation and gender identity, if known.