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Apportionment

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Newsletter Articles
Guides Newsletter (2020) 25 (5): 12–15.
Published: 01 September 2020
...Steven D. Feinberg, MD This article describes special aspects of addressing and defining substantial medical evidence, causation, and apportionment in the California Workers' Compensation system. Substantial medical evidence is framed in terms of reasonable medical probability, and the opinion must...
Newsletter Articles
Guides Newsletter (2017) 22 (4): 14–15.
Published: 01 July 2017
... impairment? How should I apportion the impairment due to his injury? ANSWER: Your approach to defining his current impairment is correct. Apportionment is applicable, assuming the legal jurisdiction that is involved permits apportionment. Section 2.5c, Apportionment, states the following...
Newsletter Articles
Guides Newsletter (2015) 20 (5): 3–11.
Published: 01 September 2015
...Stephen L. Demeter, MD, MPH; Christopher Brigham, MD, MMS; James B. Talmage, MD; J. Mark Melhorn, MD; Steven D. Feinberg, MD When they apportion impairment in musculoskeletal cases, evaluators encounter a variety of unique issues and problems. The first step in apportionment is scientifically based...
Newsletter Articles
Guides Newsletter (2015) 20 (4): 9–16.
Published: 01 July 2015
...Stephen L. Demeter, MD, MPH; E. Randolph Soo Hoo, MD, MPH Apportionment sometimes is necessary when a person had a prior injury that affected the same organ system or when there was evidence of a pre-existing disorder that was similar to the injury that will be rated. The past three editions...
Newsletter Articles
Guides Newsletter (2013) 18 (5): 1–10.
Published: 01 September 2013
...Charles N. Brooks, MD; James B. Talmage, MD Meniscal tears and osteoarthritis (osteoarthrosis, degenerative arthritis, or degenerative joint disease) are two of the most common conditions involving the knee. This article includes definitions of apportionment and causes; presents a case report...
Newsletter Articles
Guides Newsletter (2007) 12 (6): 9–11.
Published: 01 November 2007
...Christopher R. Brigham, MD; Aimee McEntire, CIR Impairment apportionment refers to the distribution or allotment of impairment to different factors such as pre-existing injury, illness, or impairment. The AMA Guides to the Evaluation of Permanent Impairment ( AMA Guides ) provides instructions...
Newsletter Articles
Guides Newsletter (2005) 10 (1): 4–5.
Published: 01 January 2005
... Guides ), Fifth Edition, particularly regarding apportionment analysis for impairment; the AMA Guides does not directly evaluate disability. Under the new California law, the following are clear: apportionment of permanent disability is based on a) causation and requires both the overall percentage...
Newsletter Articles
Guides Newsletter (2004) 9 (4): 1–11.
Published: 01 July 2004
...Christopher R. Brigham, MD; Henry J. Roth, MD In the AMA Guides to the Evaluation of Permanent Impairment ( AMA Guides ), Fifth Edition, apportionment refers to the “distribution or allocation of causation among multiple factors that caused or significantly contributed to the injury or disease...
Newsletter Articles
Guides Newsletter (2002) 7 (4): 8–10.
Published: 01 July 2002
... person permanent impairment), based on that edition's philosophy that radiculopathy is not quantifiable and, once present, is permanent. A rating of recurrent radiculopathy suggests the presence of a previous impairment rating and may require apportionment, which is the process of allocating causation...
Newsletter Articles
Guides Newsletter (1999) 4 (1): 7–8.
Published: 01 January 1999
...James B. Talmage, MD; Mohammed Ranavaya, MD, MS © 1999 American Medical Association. All Rights Reserved. 1999 American Medical Association Apportionment estimates the degree to which each of various occupational or nonoccupational factors may have caused or contributed to a particular...
Newsletter Articles
Guides Newsletter (1998) 3 (4): 7–8.
Published: 01 July 1998
...James J. Mangraviti, Jr, JD; Christopher R. Brigham, MD © 1998 American Medical Association. All Rights Reserved. 1998 American Medical Association Recently, the courts have decided important cases involving the Guides and the issue of apportionment. Two significant cases...
Newsletter Articles
Guides Newsletter (1997) 2 (6): 6–7.
Published: 01 November 1997
... of an alleged exposure or cause. Pitfalls during the assessments include the patient's aging, natural inherent limitations, self-abuse, and psychosocial factors that individually or collectively may confound medical causality and apportionment assessment. The evaluating physician alone is responsible...
Newsletter Articles
Guides Newsletter (2015) 20 (3): 15–16.
Published: 01 May 2015
... and simplify the rating process, to improve content validity, and to provide a more uniform methodology that promotes greater inter-rater reliability and agreement.” (6th ed, 558). It is important to understand how your jurisdiction approaches the issue of apportionment. Some jurisdictions do not apportion...
Newsletter Articles
Guides Newsletter (2019) 24 (3): 3–9.
Published: 01 May 2019
... and apportionment, if evaluators accept some psychological factors, MUPS, and central sensitization, they must explain to what extent these are compensable. Part two of this article will discuss theoretical and practical approaches, including specific evaluation and treatment methods. © 2019 American Medical...
Newsletter Articles
Guides Newsletter (2019) 24 (1): 3–14.
Published: 01 January 2019
... Guides, Fifth and Sixth Editions, do not use age-adjusted corrections in assessing age-related diminished hearing, but local jurisdictions and circumstances may apply apportionment. In apportioning impairment due to aging, the examiner must understand both the science and the specific legal processes...
Newsletter Articles
Guides Newsletter (2011) 16 (2): 9–11.
Published: 01 March 2011
... later, if necessary. Causation is an issue because tricompartmental arthritis clearly was not caused by the fall, but one wonders about the role of the individual's arthritis is unclear. Evaluators should be aware that such apportionment varies by jurisdiction. © 2011 American Medical Association. All...
Newsletter Articles
Guides Newsletter (1999) 4 (5): 5–6.
Published: 01 September 1999
... impairment categories are applied, including combining categories; the importance of rating the patient's condition based on the injury (as opposed to treatment outcome); and how apportionment is handled in different jurisdictions. Mr Smith, a 64-year-old high school principal, presented with numbness...
Newsletter Articles
Guides Newsletter (1999) 4 (1): 5.
Published: 01 January 1999
... Apportionment estimates the degree to which each of various occupational or nonoccupational factors may have caused or contributed to a particular impairment. Apportioning spinal impairment among different injuries often is challenging. The AMA Guides to the Evaluation of Permanent Impairment...
Newsletter Articles
Guides Newsletter (1998) 3 (6): 12.
Published: 01 December 1998
... diskettes contain an assortment of very useful forms and other resources. Types of historical information and terms unique to the IME process (for example, disability versus impairment, reasonable medical certainty, apportionment, and aggravation versus exacerbation) are discussed in detail. Furthermore...
Newsletter Articles
Guides Newsletter (2001) 6 (5): 8–10.
Published: 01 September 2001
... 18. ▭ Final rating rounded to the nearest whole person. ▭ Rated permanent impairment, not disability. ▭ Apportionment derived from rating current state of impairment and subtracting prior impairment using current edition of the Guides , providing an explanation of the medical basis for all...