PTSD and Psychiatric Injury in Workers' Comp: The Thresholds, the 4660.1 Bar, and Apportionment

Short answer: PTSD and other psychiatric injuries are covered by California workers' comp, but under rules that are stricter than for physical injury. Labor Code section 3208.3 requires that actual events of employment be the predominant cause of the psychiatric injury, meaning more than half, with a lower substantial-cause threshold where the injury results from a violent act. Section 4660.1 bars an increase in permanent disability for a psychiatric disorder that arises as a consequence of a physical injury on or after January 1, 2013, unless the worker was the victim of a violent act or suffered a catastrophic injury. And apportionment applies to psychiatric disability the same way it applies to physical disability, with the added requirement that the report state the percentage of causation from actual events of employment.

The psych breakouts at the 2026 CSIMS MedLaw Conference, "Apportionment & Impairment Complexities in Psych" on Friday morning and "QME Reports: Psych Challenges" that afternoon, were built around exactly these three layers (conference agenda). Each layer has its own statute, its own case law, and its own way of failing in a report.

Is PTSD covered by workers' comp in California?

Yes, as a psychiatric injury under Labor Code section 3208.3. The statute covers a mental disorder that causes disability or need for treatment and is diagnosed under accepted procedures, which in current practice means the DSM. PTSD is one such diagnosis; so are major depressive disorder, adjustment disorder, and anxiety disorders. The diagnosis is the beginning of the analysis, not the end of it, because 3208.3 adds causation thresholds that physical injuries do not carry.

What is the predominant-cause threshold?

Section 3208.3 requires the employee to show, by a preponderance of the evidence, that actual events of employment were predominant as to all causes combined of the psychiatric injury. Predominant means more than 50 percent. The psych QME therefore has to do something no orthopedic evaluator does: assign approximate percentages to every cause of the psychiatric condition, industrial and non-industrial, and determine whether the industrial events clear half.

Where the injury results from being a victim of a violent act or from direct exposure to a significant violent act, the threshold drops to substantial cause, which the statute defines as at least 35 to 40 percent of the causation from all sources combined.

Three further provisions shape the causation analysis. A psychiatric injury is not compensable if it was substantially caused by a lawful, nondiscriminatory, good-faith personnel action. An employee generally must have been employed for at least six months, unless the injury was caused by a sudden and extraordinary employment condition. And 8 CCR section 10682 requires the report itself to state a determination of the percent of the total causation resulting from actual events of employment. A psych report that gives a diagnosis and an impairment without that percentage has omitted the element the case turns on. The judges' redline post lists it among the defects judges catch first.

When does Labor Code 4660.1 block a psychiatric rating?

For injuries on or after January 1, 2013, section 4660.1(c) provides that there shall be no increase in permanent disability for a psychiatric disorder, sleep dysfunction, or sexual dysfunction that arises out of a compensable physical injury. A worker with an industrial back injury who develops depression as a consequence of the pain and disability cannot add a psychiatric impairment to the rating. The statute preserves the right to treatment for the psychiatric condition; it removes the permanent disability increase.

Two exceptions restore the psychiatric rating. The first is being a victim of a violent act or direct exposure to a significant violent act within the meaning of section 3208.3. The second is a catastrophic injury, which the statute illustrates with loss of a limb, paralysis, severe burn, or severe head injury.

The Appeals Board addressed what catastrophic means in Wilson v. State of California CalFire (2019) 84 Cal.Comp.Cases 393 (en banc). The determination turns on the nature of the injury rather than the mechanism, and the Board identified factors to weigh: the intensity and seriousness of the treatment received, the ultimate outcome when the worker is permanent and stationary, the severity of the impairment on activities of daily living, closeness to one of the statutory examples, and whether the injury is incurable or progressive. A psych QME evaluating a compensable-consequence claim has to address whether either exception applies, because if neither does, the psychiatric impairment rating has no legal effect on the award however carefully it was calculated.

The bar does not apply to a psychiatric injury that is itself the industrial injury, such as PTSD from witnessing a workplace death or a robbery. It applies to psychiatric conditions that are downstream of a physical injury.

How is psychiatric impairment rated?

Through the Global Assessment of Functioning score converted to whole person impairment under the 2005 Permanent Disability Rating Schedule. The psychological whole person impairment post carries the conversion table and the method. What matters for this post is that the GAF has to be supported by the history, mental status examination, and records in the same way an orthopedic rating has to be supported by measurements, and that the report has to explain why the score is where it is.

How does apportionment work for psychiatric injury?

Labor Code section 4663 applies to psychiatric permanent disability as it does to physical. The physician states what approximate percentage was directly caused by the industrial injury and what approximate percentage by other factors, and explains why.

The psych apportionment analysis has a structural advantage and a structural hazard. The advantage is that the 3208.3 causation analysis already required the physician to identify every cause of the psychiatric condition and assign percentages. The hazard is that causation of the injury and causation of the disability are different questions, and the temptation to copy the 3208.3 percentages into the 4663 apportionment is strong. A non-industrial stressor that contributed 30 percent to the onset of the depression may be contributing more or less than 30 percent to the permanent psychiatric disability at the time of the evaluation. The apportionment post explains why an opinion that confuses the two is not substantial evidence.

Typical non-industrial factors in psych apportionment include pre-existing psychiatric diagnoses and treatment, prior trauma, personality disorders, substance use, and concurrent non-industrial stressors such as divorce, bereavement, or financial hardship. Each has to be established in the record rather than assumed from the diagnosis, and the physician has to explain how it contributes to the current disability. Apportionment to a personality disorder is defensible when the records and examination support the diagnosis and the physician explains how the traits are sustaining the impairment. Apportionment to "the examinee's personality" is not.

Escobedo v. Marshalls (2005) 70 Cal.Comp.Cases 604 (en banc) governs the adequacy of the reasoning, and Benson v. WCAB (2009) 170 Cal.App.4th 1535 requires separate apportionment for each industrial injury where there is more than one, which arises often in psych cases where a cumulative trauma claim is filed alongside a specific injury.

What records decide a psychiatric case?

Prior mental health records, and the absence of them. A history of pre-injury treatment for depression or anxiety changes the 3208.3 percentages, the 4663 apportionment, and the credibility of a history that omits it. Primary care records matter as much as psychiatric ones, because antidepressant prescriptions and mood complaints are documented there far more often than in specialty notes. Personnel records and incident reports establish the actual events of employment. And in compensable-consequence cases, the physical injury records establish whether the injury was catastrophic under Wilson.

A psych production is long and most of it is somatic. Lexamed dates and page-cites every encounter across the production, so a pre-injury sertraline prescription in a 2017 primary care note or a documented non-industrial stressor in a social work assessment is surfaced as a lead for the evaluator to weigh rather than left for the deposition. The percentages, the diagnosis, and the GAF are the physician's.

Frequently asked questions

Is PTSD covered by workers' comp in California? Yes, as a psychiatric injury under Labor Code 3208.3, provided actual events of employment were the predominant cause, meaning more than half of all causes combined. Where the injury results from a violent act, the threshold is substantial cause, at least 35 to 40 percent.

What is the difference between predominant cause and substantial cause? Predominant cause is more than 50 percent of all causes combined and is the general standard for psychiatric injury. Substantial cause is at least 35 to 40 percent and applies where the injury results from being a victim of, or directly exposed to, a significant violent act.

Can a worker get a psychiatric rating for depression caused by a physical injury? For injuries on or after January 1, 2013, generally no. Labor Code 4660.1(c) bars an increase in permanent disability for a psychiatric disorder arising from a compensable physical injury, unless the worker was the victim of a violent act or suffered a catastrophic injury. Treatment remains available.

What counts as a catastrophic injury under 4660.1? The statute gives examples: loss of a limb, paralysis, severe burn, severe head injury. Under Wilson v. State of California CalFire (2019), the determination looks at the nature of the injury, weighing the intensity of treatment, the outcome at permanent and stationary status, the effect on daily activities, closeness to the statutory examples, and whether the injury is incurable or progressive.

Does apportionment apply to psychiatric injury? Yes. Labor Code 4663 applies to psychiatric permanent disability. The physician apportions between the industrial injury and other factors such as prior psychiatric history, prior trauma, personality disorders, and non-industrial stressors, with reasoning that meets Escobedo.

What does a psych QME report have to include that other reports do not? A determination of the percent of the total causation resulting from actual events of employment, required by 8 CCR 10682 and necessary to apply the 3208.3 thresholds.

Is there a minimum employment period for a psychiatric claim? Generally six months, unless the injury was caused by a sudden and extraordinary employment condition.

Can a psychiatric claim be denied because of a personnel action? Yes. A psychiatric injury substantially caused by a lawful, nondiscriminatory, good-faith personnel action is not compensable under 3208.3.