Question Answer
What is the QME’s duty regarding substantial medical evidence? Provide detailed reasoning backed by records
exam findings
Mnemonic for substantial medical evidence “REAL” — Records
Exam
How should QMEs treat prior awards of permanent disability? A prior WCAB award creates a presumption that the % is non-industrial unless medical evidence shows further industrial aggravation.
What is rebutting LC §4664 presumption? Providing medical evidence showing the current injury is new or worsened beyond the previously awarded % PD.
Can a QME apportion to risk factors like smoking? No — apportionment must be to actual pathology or disability
not just risk exposure.
How does apportionment affect rating strings? The WPI % is first calculated
then apportionment is applied to reduce the industrial % of permanent disability.
Mnemonic for apportionment calculation “RCA” — Rate impairment
Combine if multiple
What if QME cannot determine exact % apportionment? Must still give best medical estimate based on probability; cannot say “cannot apportion” without explanation.
Why is temporal relationship important in apportionment? Onset before injury or worsening after injury helps differentiate pre-existing vs industrial contribution.
What role do diagnostic imaging studies play? Show pre-existing degeneration/pathology supporting non-industrial apportionment.
Example: Preexisting lumbar degeneration + new strain. QME may assign 40% preexisting (degeneration)
60% new work-related strain if supported by imaging and history.
Can “psychological vulnerability” alone justify apportionment? No — must be tied to documented pre-existing psychiatric diagnosis or functional impairment.
Mnemonic for apportionment report intro “HOD” — History
Objective findings
What is the combined apportionment approach? Splitting PD among several factors (e.g.
40% work
When is no apportionment appropriate? Only when work is the sole cause of permanent impairment and no credible non-industrial contributors exist.
Why must QMEs avoid speculative apportionment? WCAB will strike opinions not based on reasonable medical probability and evidence.
How to apportion in cumulative trauma? Identify percentage of PD from each job period and pre-existing degeneration; requires careful work history timeline.
Can apportionment exceed 100% total? No — all contributing percentages must combine to 100% of the permanent disability.
What is the “lighting up” vs “direct cause” distinction? Lighting up = work activates latent condition; Direct cause = new pathology entirely due to work.
Mnemonic for cumulative trauma apportionment “DATE” — Duties timeline
Activities
What is pathological apportionment? Attributing part of disability to pre-existing structural disease
even if asymptomatic before the industrial event.
How does return-to-work ability affect apportionment? It doesn’t directly change % but helps gauge functional loss from work injury vs prior disability.
What if prior condition was asymptomatic but measurable? Still apportionable if medical evidence shows it contributed to PD after work injury.