Authorities as the decision cited them, with how this panel applied each one.
Labor Code section 5412
Date of injury in cumulative injury cases is the date employee first suffered disability and knew or should have known it was caused by employment (Lab. Code § 5412).
Applied to clarify the date of injury and reject defendant's argument conflating date of injury and date of exposure.
From the decision · page 4Turning now to the merits of the Petition, section 3208.1 provides that: "An injury may be
either: (a) `specific,' occurring as the result of one incident or exposure which causes disability or
need for medical treatment; or (b) `cumulative,' occurring as repetitive mentally or physically
traumatic activities extending over a period of time, the combined effect of which causes any
disability or need for medical treatment. The date of a cumulative injury shall be the date
determined under Section 5412."
Labor Code section 3208.1
An injury may be specific or cumulative; cumulative injury occurs from repetitive activities over time causing disability or need for medical treatment (Lab. Code § 3208.1).
Applied to define cumulative injury and its date determination.
From the decision · page 4Turning now to the merits of the Petition, section 3208.1 provides that: "An injury may be
either: (a) `specific,' occurring as the result of one incident or exposure which causes disability or
need for medical treatment; or (b) `cumulative,' occurring as repetitive mentally or physically
traumatic activities extending over a period of time, the combined effect of which causes any
disability or need for medical treatment. The date of a cumulative injury shall be the date
determined under Section 5412."
Labor Code section 5500.5
Liability for cumulative injury claims limited to employers during one year preceding date of injury or last exposure (Lab. Code § 5500.5).
Clarified distinction between date of injury and date of exposure for liability purposes.
From the decision · page 4Section 5500.5(a) provides that: "Except as otherwise provided in Section 5500.6, liability
for occupational disease or cumulative injury claims filed or asserted on or after [January 1, 1981]
shall be limited to those employers who employed the employee during a period of [one year]
immediately preceding either the date of injury, as determined pursuant to Section 5412, or the last
date on which the employee was employed in an occupation exposing him or her to the hazards of
the occupational disease or cumulative injury, whichever occurs first."
Medical opinion must be based on relevant facts, adequate examination, and correct legal theories to constitute substantial evidence (E.L. Yeager v. WCAB, Kyle v. WCAB).
Applied to evaluate Dr. Hughes' report as substantial evidence supporting injury and medical treatment need.
From the decision · page 5As parties are well aware, a decision "must be based on admitted evidence in the record"
and supported by substantial evidence. (Lab. Code, § 5903, 5952, subd. (d); Hamilton v. Lockheed
Corporation (Hamilton) (2001) 66 Cal.Comp.Cases 473, 476, 478 (Appeals Bd. en banc); Lamb
v. Workmen's Comp. Appeals Bd. (1974) 11 Cal.3d 274 [39 Cal.Comp.Cases 310]; Garza v.
Workmen's Comp. Appeals Bd. (1970) 3 Cal.3d 312 [35 Cal.Comp.Cases 500]; LeVesque v.
Workers' Comp. Appeals Bd. (1970) 1 Cal.3d 627 [35 Cal.Comp.Cases 16].) Pursuant to E.L.
Yeager v. Workers' Comp. Appeals Bd. (Gatten) (2006) 145 Cal.App.4th 922, 928 [71
Cal.Comp.Cases 1687], "[a] medical opinion is not substantial evidence if it is based on facts no
longer germane, on inadequate medical histories or examinations, on incorrect legal theories, or