ABSTRACT Using a new and rich data source on permanent disability claims, this article explores two issues relating to permanent partial disability (PPD) benefits. First, the process of determining the final disability rating, which affects the actual level of PPD benefits, is modeled. Differences between the initial impairment rating provided by the treating physician and the final disability rating investigated to determine what factors, in addition to physical impairment, influence the determination of the final permanent, partial disability rating and, hence, the amount of indemnity benefits. This investigation highlights and measures some of the equity concerns inherent in establishing PPD benefits. Second, the influence of the final disability rating on the dollar amount of the permanent partial and total indemnity benefit award is measured. The empirical findings suggest that the same injuries, as measured by a physician impairment rating, may receive very different final disability ratings and thus have very different claim costs as a result of factors unrelated to the injury. These differences magnified across states. INTRODUCTION The adequacy and equity of benefits for permanently disabled workers continues to be a vexing problem for workers' compensation insurance. The 1972 National Commission on State Workers' Compensation Laws offered the view that permanent partial benefits are the most controversial and complex aspect of workmen's [sic] compensation The National Commission also observed that for no other type of benefit there more variations among states or more divergence between statutes and practice. Even after 20 years of significant reforms, these issues remain unresolved today. Moreover, recent studies have suggested that a substantial portion of the significant cost increases in the 1980s into the early 1990s in workers' compensation may be due to higher costs associated with permanent disability cases. Permanent partial disability (PPD) benefits account for approximately twothirds of the total costs of workers' compensation disability benefits (Berkowitz and Burton, 1987). Not surprisingly, the proportion of total benefits accounted for by permanent partial compensation also has been shown to be positively correlated to employer premiums (Krueger and Burton, 1990). Both the frequency and average cost of PPD cases have increased significantly in recent years. During the six-year period from 1988 to 1994, average PPD costs increased 25 percent, an increase of approximately 4 percent per year, while the frequency increased almost 29 percent or 4.4 percent annually. These increasing average costs and frequencies have resulted in an increase in the permanent partial cost per worker of approximately 52 percent (over 7 percent annually) over the same six year period. (National Council on Compensation Insurance, 1989-1995). Despite the importance of permanent partial benefits as a contributing factor to the increase in workers' compensation costs, little research has examined the factors that influence the costs of permanent partial disability claims. Using a new and rich data source on permanent disability claims, this article explores two issues relating to permanent partial disability benefits. First, we model the process of determining the final disability rating, which affects the actual level of PPD benefits. In this analysis, differences between the initial impairment rating provided by the treating physician and the final disability rating investigated to determine what factors, in addition to physical impairment, influence the determination of the final permanent partial disability rating and, hence, the amount of indemnity benefits. This investigation highlights and measures some of the equity concerns inherent in establishing PPD benefits. Second, we measure the influence of the final disability rating on the dollar amount of the permanent partial and total indemnity benefit award. …
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