The AMA Guides to the Evaluation of Permanent Impairment is a widely used resource in Workers’ Compensation systems to assess and quantify the extent of impairment resulting from a work-related injury or illness. These guides provide standardized criteria and methodologies for evaluating impairments across various body systems. The evaluation based on the AMA Guides often influences decisions regarding compensation, disability ratings, and the level of benefits an individual may receive. Since the first AMA Guides were published in 1971, they have evolved greatly into six varying editions. States vary in their applications of the Guides, even using different versions; the specific guidelines and regulations can also vary by jurisdiction. Therefore, understanding and applying the appropriate edition or guidelines relevant to a particular region or case is essential in the Workers’ Compensation process, and broadening your understanding can help garner different cases.
AMA 4th Edition
The 1993 publication of the 4th Edition marked a significant advancement in the AMA Guides with several enhancements. These included the Diagnosis-Related Estimates (DRE) or “injury” model specifically designed for evaluating spinal injuries, alternate methods for assessing lower-extremity impairment, and the addition of a dedicated chapter focusing on pain assessment. There are currently seven states that still use the 4th Edition, including Alabama, Pennsylvania, and Texas.
AMA 5th Edition
The 5th Edition of the AMA Guides was published in 2000 and included updates and revisions based on advancements in medical knowledge and practices since the 4th edition. It expanded on the range of motion (ROM) method of rating, especially for spinal impairment evaluations. The 5th Edition increased focus on function rather than impairment alone, aiming to better reflect an individual’s ability to perform tasks and daily activities. There are currently 12 states that exclusively use the 5th Edition for their Workers Compensation, including California, Nevada and Washington, and other states that rely on the 5th Edition as an option.
AMA 6th Edition
The 6th Edition of the AMA Guides was published in December of 2007 and expanded the concept of impairment to include broader considerations of an individual’s overall health, functioning, and quality of life. It is more uniform throughout the body systems, including a standardized approach across organ systems and chapters. The 6th Edition also includes the latest scientific research and evolving medical opinions provided by nationally and internally recognized experts, as well as a unified methodology that helps physicians calculate impairment ratings through a grid construct and promotes consistent scoring of impairment ratings. Furthermore, the 6th Edition effectively removes the ROM method for spinal assessment and extends the DRE methodology to introduce a new Diagnosis-Based Impairment (DBI) terminology. There are currently 22 states and entities that utilize the 6th Edition for Workers Compensation, including Alaska, which will allow its injured workers to travel for evaluations; it is also used by The Federal Department of Labor, and personal injury/medical malpractice cases in California. Knowledge of both the 5th and 6th editions is extremely useful for Orthopaedic Surgeons in California.
Older AMA Editions and other sources
The 3rd Edition of the AMA Guides (first published in 1988 with a revision in 1990) is still utilized by two states: Colorado and Oregon. The 3rd Edition was the first to use the Swanson Methodology, which assigned discreet impairment ratings to the specific range of motion (ROM) deficits of the upper extremities. This edition relied on traditional assessment methods without the refined approaches introduced in the later editions. The 3rd Edition is also considered to be less comprehensive in its assessment scope and methodologies than the 4th, 5th and 6th.
There are some states that allow for physicians to select from different versions of the Guides and other states that do not require use of the Guides at all.
Why the Editions Vary by State
States have the autonomy to determine their Workers’ Compensation laws and regulations. Some states adopt specific editions of the AMA Guides through legislative processes or regulatory decisions. This adoption can be influenced by various factors, including medical advancements, legal considerations, and stakeholder input. Different states may have also adopted different editions of the AMA Guides at various times. Some states may have chosen to adopt earlier editions and haven’t updated to the most recent editions due to various reasons including cost considerations, perceived effectiveness of the existing guidelines, or a lack of impetus for change.
Certain states may favor a more medically-centered assessment (as in earlier editions), while others prioritize a broader, function-based approach (as in later editions). Introducing a new edition of the AMA Guides could necessitate resources for training evaluators, system updates, and ensuring a seamless transition. Some states could postpone adoption due to resource constraints or the need for adequate preparation.
These factors collectively contribute to the variations among states in terms of the edition of the AMA Guides they use for Workers’ Compensation cases. Each state may consider these factors with varying weight, resulting in distinct choices concerning the edition they find applicable. Knowledge and mastery of the various AMA Guides publications can broaden a forensic physician’s ability to work in underserved states and a variety of medicolegal cases.