Cal. Health & Safety Code § 127457
(a) After the period described in Section 127455, and upon the completion of appeals consistent with Section 127456, prior to commencing further collection activities against a patient, the emergency physician, any assignee of the emergency physician, or other owner of the patient debt, including a collection agency, shall not report adverse information to a consumer credit reporting agency or commence a civil action, until after the patient has been provided with a clear and conspicuous written notice containing both of the following: