What Is a QME or AME in California Workers' Compensation? Do I Need One?

What is the difference between a QME and an AME?

A QME is selected through the state-issued panel-strike process; an AME is agreed on jointly by the parties without a panel.

A Qualified Medical Evaluator (QME) is a physician certified by the California Division of Workers' Compensation Medical Unit to perform medical-legal evaluations. Any California physician who meets the qualifications and applies can become a QME, the certification is open. When a medical dispute arises in a workers' comp case, a panel of three QMEs is generated from the DWC Medical Unit, and the parties select one of the three to perform the evaluation under California Labor Code §4062.2 (or California Labor Code §4062.1 for unrepresented workers).

An Agreed Medical Evaluator (AME) is a single physician the parties agree on, in advance, to perform the evaluation. The AME process bypasses the three-panel system. AMEs are used when both sides trust a particular physician enough to use them without a panel selection, typically a well-known California workers' comp specialist with a reputation for fair and detailed reports. The AME's opinion carries significant weight precisely because both sides agreed to use that physician.

When is a QME or AME actually needed in a California case?

When the treating physician and the insurer disagree on diagnosis, impairment, apportionment, future medical, or work restrictions, and the dispute requires a medical-legal record.

A QME or AME is needed whenever there is a medical dispute in the case. The most common triggers include the insurer's denial of compensability (whether the injury is work-related), the insurer's challenge to the treating physician's impairment opinion, a dispute over apportionment under California Labor Code §4663 between industrial and non-industrial causes, a dispute over whether the worker is at Maximum Medical Improvement (P&S status), a dispute over whether a body part is part of the claim, and a dispute over future medical care needs.

For a represented worker, one with an attorney, the §4062.2 panel process kicks in when the parties exchange written objections or requests for an evaluation. For an unrepresented worker, the California Labor Code §4062.1 process applies, with the same panel-of-three mechanic but procedural differences. Many cases use an AME instead, by stipulation of the parties.

How does the §4062.2 panel process actually work?

Each side requests a panel of three physicians, each strikes one, and the remaining QME conducts the evaluation and issues a written medical-legal report.

Under California Labor Code §4062.2, after a written objection or request, the requesting party submits a QME panel request to the DWC Medical Unit. The Medical Unit issues a panel of three QMEs in the appropriate specialty, randomly selected from the QME registry. The parties then each have a window, typically 10 days, to strike one panelist. After the strikes, one QME remains, and the worker schedules the evaluation with that QME.

The panel-strike strategy matters. A specialist attorney evaluates each panelist's reputation, history of opinions on similar injuries, treatment philosophy, and apportionment tendencies before striking. A poorly-considered strike can leave the worker with a panelist whose record on the relevant injury favors the insurer. The strike is one of the most consequential strategic choices in a California workers' comp case.

What does the AME alternative look like?

The parties jointly agree on one specialist instead of using the panel process; the AME report carries significant weight at trial because both sides chose the doctor.

An AME is a single physician agreed to by both parties in advance, typically through stipulation between the worker's attorney and the insurer's defense counsel. The AME process saves the time of the panel-and-strike sequence and produces a report from a single agreed-on physician. AMEs are common in California workers' comp practice because both sides often share short lists of physicians they trust to write fair, defensible reports.

The AME's opinion carries significant evidentiary weight because both sides agreed to the physician. The WCAB judge typically follows the AME's report unless there are specific reasons to depart from it. A worker who has confidence in an AME's reputation may prefer the AME path; a worker whose attorney has a strong panel-strike strategy may prefer the QME panel.

What happens at the QME or AME evaluation?

Medical history review, focused physical examination, review of imaging and treatment records, and a written report addressing diagnosis, impairment, causation, and apportionment.

The evaluation typically lasts 30 to 90 minutes and includes a physical examination, a review of the medical records the parties have provided, and questioning about the worker's history and current symptoms. The QME or AME then produces a medical-legal report typically within 30 to 60 days. The report addresses every disputed question, causation, apportionment, impairment rating per the AMA Guides 5th Edition under California Labor Code §4660, Maximum Medical Improvement, future medical care needs under California Labor Code §4600, and any other issue the parties have raised.

Under California Labor Code §5811, the worker is entitled to a qualified interpreter at the QME or AME evaluation, with the cost charged to the defendant. Many California workers' comp evaluations are conducted with Spanish, Korean, Mandarin, Tagalog, or other interpreters, and the interpreter cost does not come out of the worker's settlement.

What if the worker disagrees with the QME or AME report?

A specialist challenges the report with a supplemental question process, a deposition, or a follow-up evaluation aimed at the specific issue in dispute.

A specialist attorney has several options. First, request a supplemental report from the QME or AME with specific questions on the disputed findings, apportionment percentage, impairment basis, MMI determination. Second, depose the physician on the record to expose reasoning gaps. Third, on truly defective reports, request a replacement QME panel for cause. Fourth, if the case proceeds to trial on the QME report and the worker disagrees with the resulting Findings and Award, file a Petition for Reconsideration within 25 days of service by mail (or 20 days from electronic service) under California Labor Code §5903.

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