Cal. Health and Safety Code § 24250

(a) A health care provider entity shall, to the extent possible, establish or amend procedures for monitoring, documenting, and receiving visitors to health care provider entities consistent with this chapter. Health care provider entities are encouraged to post a “notice to authorities” at facility entrances. (b) (1) Health care provider entity personnel shall immediately notify health care provider entity management, administration, or legal counsel of any request for access to a health care provider entity site or patient for immigration enforcement. (2) Health care provider entity personnel shall immediately provide any requests for review of health care provider entity documents, including through a lawfully issued subpoena, warrant, or court order, to health care provider entity management, administration, or legal counsel. (3) If a request is made to access a health care provider entity site or patient, including to obtain information about a patient or their family, for immigration enforcement, health care provider entity personnel shall direct that request to the designated health care provider entity management, administrator, or legal counsel.