Cal. Lab. Code § 5500
No pleadings other than the application and answer shall be required. Both shall be in writing and shall conform to forms prescribed by the appeals board in its rules of practice and procedure, simply but clearly and completely delineating all relevant matters of agreement and all issues of disagreement within the jurisdiction of the appeals board, and providing for the furnishing of any additional information as the appeals board may properly determine necessary to expedite its hearing and determination of the claim.
The amendment of this section made during the 1993 portion of the 1993-94 Regular Session shall apply to all applications filed on or after January 1, 1994.
Notwithstanding Section 5401, except where a claim form has been filed for an injury occurring on or after January 1, 1990, and before January 1, 1994, the filing of an application for adjudication and not the filing of a claim form shall establish the jurisdiction of the appeals board and shall commence proceedings before the appeals board for the collection of benefits.
Ca. Lab. Code § 5500