Any claimant or dependent of a claimant who resides in this State and who receives compensation pursuant to chapters 616A to 616D, inclusive, of NRS for a permanent total disability for an injury or a disablement from an occupational disease which occurred before July 1, 1973, is entitled to a 20 percent increase in that compensation without regard to any limitation on wages imposed by those chapters on the amount of that compensation.
NRS 616C.460