Every disputed California comp case eventually turns on a medical-legal report — and who writes it is one of the most consequential choices in the file. This guide covers the two evaluators whose findings drive PD ratings: the panel QME and the AME.
The QME: the panel process
When the parties dispute a medical question — the level of impairment, causation, apportionment, whether the worker is permanent and stationary — a Qualified Medical Evaluator is obtained through the DWC’s panel process: a randomly-generated list of three certified physicians in the relevant specialty, from which the parties strike and select. In unrepresented cases the process is worker-driven with the claims administrator; in represented cases the attorneys handle the strikes.
The QME examines the worker, reviews records, and issues a report stating whole-person impairment under the AMA Guides, apportionment under Labor Code §4663, and related opinions. That report — sometimes rated by the DEU, sometimes by the parties — supplies the WPI that the rating schedule turns into a percentage.
The AME: the negotiated evaluator
In represented cases, both attorneys can skip the panel roulette and agree on an evaluator. That agreement is the AME’s power: when a doctor both sides picked issues findings, judges give the opinion substantial weight, and the party attacking it faces an uphill fight. AMEs are typically evaluators with long reputations — both sides know roughly how they examine, how they write, and how they apportion.
The strategic difference in one sentence
A panel QME is a lottery with three tickets; an AME is a settlement about the referee. Defense and applicant attorneys weigh the same things from opposite directions: predictability versus the chance of a favorable draw, the doctor’s known tendencies on apportionment, and how the report will hold up if the case tries.
From either report to the number
Whoever writes it, the report’s arithmetic fate is identical: the WPI for each body part runs through the rating pipeline — the earning-capacity adjustment, the occupational variant, the age adjustment, apportionment, and the Combined Values Chart. Two reports with different WPI or different apportionment produce different money in a completely mechanical way — which is why modeling both positions side by side (the calculator’s compare feature does exactly this) is often the fastest way to see what a dispute is actually worth.
Practical pointers
Read the WPI tables, not just the conclusion — rating errors usually live where the report’s numbers meet the schedule, and a quick re-computation catches them. Watch the apportionment language — a percentage without substantial-evidence reasoning is a common attack point in either direction. Date the strategy — evaluator choice happens early, but its consequences arrive at rating time; running the likely WPI ranges through the calculator before selecting can tell you which disputes are worth having.
RateString is informational, not legal advice — evaluator strategy is exactly the kind of judgment that belongs to counsel.