Cal. Health & Safety Code § 127425
(a) A hospital shall not sell patient debt to a debt buyer, as defined in Section 1788.50 of the Civil Code, unless all of the following apply:
(e) Before assigning a bill to collections, or selling patient debt to a debt buyer, a hospital shall send a patient a notice with all of the following information:
(f) A hospital, any assignee of the hospital, or other owner of the patient debt, including a collection agency or debt buyer, shall not do either of the following:
(h)
(2) A collection agency, debt buyer, or other assignee that is not a subsidiary or affiliate of the hospital shall not, in dealing with any patient under the hospital’s charity care or discount payment policies, use as a means of collecting unpaid hospital bills, any of the following:
(j)
(1) A hospital shall maintain all records relating to money owed to the hospital by a patient or a patient’s guarantor for five years, including, but not limited to, all of the following:
(C) A list, updated at least annually, of every person, including the person’s name and contact information, that meets at least one of the following criteria: