CA Code of Reg. Title 8, Ch. 4.5 Sub Ch. 1 Art. 7
California Permanent Disability Rating Schedule, an impairment-based rating system which is based on the 5th edition and modifies ratings based on adjustments for Future Earning Capacity, occupational demands and age. 5th adopted as of January 1, 2005. California Workers' Compensation Appeals Board issued a decision February 2009 in the consolidated cases of Almaraz v. SCIF, et al. and Guzman v. Milpitas Unified School District that the AMA Guides were rebuttable.