California Code, Labor Code - LAB § 4903.6

(a) Except as necessary to meet the requirements of Section 4903.5, a lien claim or application for adjudication shall not be filed or served under subdivision (b) of Section 4903 until both of the following have occurred:

(b) All lien claimants under Section 4903 shall notify the employer and the employer's representative, if any, and the employee and the employee's representative, if any, and the appeals board within five working days of obtaining, changing, or discharging representation by an attorney or nonattorney representative. The notice shall set forth the legal name, address, and telephone number of the attorney or nonattorney representative.

(c) A declaration of readiness to proceed shall not be filed for a lien under subdivision (b) of Section 4903 until the underlying case has been resolved or where the applicant chooses not to proceed with the applicant's case.

(d) With the exception of a lien for services provided by a physician as defined in Section 3209.3, a lien claimant shall not be entitled to any medical information, as defined in subdivision (i) of Section 56.05 of the Civil Code, about an injured worker without prior written approval of the appeals board. Any order authorizing disclosure of medical information to a lien claimant other than a physician shall specify the information to be provided to the lien claimant and include a finding that the information is relevant to the proof of the matter for which the information is sought. The appeals board shall adopt reasonable regulations to ensure compliance with this section, and shall take any further steps as may be necessary to enforce the regulations, including, but not limited to, impositions of sanctions pursuant to Section 5813.

(e) The prohibitions of this section do not apply to lien claims, applications for adjudication, or declarations of readiness to proceed filed by or on behalf of the employee, or to the filings by or on behalf of the employer.