(a) For all claims before January 1, 2005, not subject to section 46.1(b), the method of measuring the elements of foot and ankle shall be set forth below in the “Guidelines for Evaluation of Foot and Ankle Disability” as adopted by the Industrial Medical Council on October 28, 2000. The full text of this document is available on the web at no charge at www.dir.ca.gov/IMC/guidelines.html or by calling the Medical Unit at 1-800-794-6900.

(b) For all claims having dates of injury on or after January 1, 2005, and for those compensable claims arising before January 1, 2005, where there has been either no comprehensive medical-legal report or no report by a treating physician indicating the existence of permanent disability, or when the claims administrator, or if none the employer, is not required to provide the notice required by section 4061 to the injured worker, the method of measuring the elements of foot and ankle impairment shall be described in the American Medical Association, Guides to the Evaluation of Permanent Impairment [Fifth Edition] (AMA Guides). Permanent disability shall be described by applying the provisions of the Permanent Disability Rating Schedule adopted by the Administrative Director pursuant to section 9805 of Title 8 of the California Code of Regulations.