Previous Disability. The fact that an employee has suffered previous disability or received compensation therefor shall not preclude the employee from compensation for a later accidental personal injury or occupational disease. In the event there exists a previous permanent partial disability, including a previous non- work-related injury or condition which produced permanent partial disability and the same is aggravated or accelerated by an accidental personal injury or occupational disease, compensation for permanent partial disability shall be only for such amount as was caused by such accidental personal injury or occupational disease and no additional compensation shall be allowed for the preexisting disability or impairment. Any such reduction shall not apply to temporary total disability, nor shall it apply to compensation for medical treatment. a. If workers' compensation benefits have previously been awarded through settlement or judicial or administrative determination in Oklahoma, the percentage basis of the prior settlement or award shall conclusively establish the amount of permanent partial disability determined to be preexisting. If workers' compensation benefits have not previously been awarded through settlement or judicial or administrative determination in Oklahoma, the amount of preexisting permanent partial disability shall be established by competent evidence. b. In all cases, the applicable reduction shall be calculated as follows: (1) if the preexisting impairment is the result of injury sustained while working for the employer against whom workers' compensation benefits are currently being sought, any award of compensation shall be reduced by the current dollar value attributable under the Administrative Workers' Compensation Act to the percentage of permanent partial disability determined to be preexisting. The current dollar value shall be calculated by multiplying the percentage of preexisting permanent partial disability by the compensation rate in effect on the date of the accident or injury against which the reduction will be applied, and (2) in all other cases, the employer against whom benefits are currently being sought shall be entitled to a credit for the percentage of preexisting permanent partial disability.
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Sources: Workers' Compensation Act, Workers' Compensation Act