Cumulative Injury From Several Jobs: Which Employer Do You Name, and Can You Pursue Just One?

If your cumulative injury built up while you worked for several employers, California generally holds liable only the employers from one year: the year before your legal date of injury or the last day of harmful work, whichever came first. You may pursue any one or more of those employers, and employers outside that year are generally not liable, although identifying the year depends on dates that are often disputed.

Labor Code section 5500.5 sets these rules for cumulative injury: harm from repeated activity over time.

Start with the final year, not your whole career

Section 5500.5(a) limits liability to employers that employed you during the one year immediately before the earlier of two dates. The first is the date of injury under section 5412: when you first suffered disability and knew, or reasonably should have known, that work caused it. The second is the last day you worked in an occupation exposing you to the hazards that caused the injury.

Take a hypothetical warehouse worker who lifted at Company A for six years, then at Company B for two, then at Company C for ten months, and stopped lifting when she left C, with no gap between jobs. If her last harmful work came before her section 5412 date, the one-year window runs back from that last day. It covers C and the last two months at B. Company A, where most of the years were spent, falls outside. Our guide to building the two dates explains how to establish each date from records.

List every employer from that year

When a cumulative injury may have arisen from more than one employment, section 5500.5(b) requires the application to state the names and addresses of every employer liable under the one-year rule, the places of employment and the approximate periods of exposure. Naming only the employer where you spent the most years can leave out the one the law points to.

An omission can be corrected. Any party may ask the Board to join a missing employer at or before the first hearing; only one continuance is allowed for that purpose. After the first hearing, the Board must still join an employer that appears to be a proper party, but that employer’s liability is decided in later supplemental proceedings.

You may choose to pursue one employer

Under section 5500.5(c), an injured worker or dependents “may elect to proceed against any one or more of the employers” within the one-year period. You must prove the claim against at least one employer you named. An award against two or more liable employers is joint and several, which means you can collect the full award from any of them.

Electing one employer does not end the matter for the others: any party can move to join another proper employer, and an employer held liable can later seek contribution from the other employers joined, initially or supplementally, in a contribution proceeding. In our reading, it can make sense to choose the employer whose records and witnesses best prove the injury. An employer joined after the first hearing or after the election cannot take part before the final decision or get a continuance, though it may ask you about the time, place and duration of your work and may fully examine witnesses in the later supplemental proceedings.

The employers divide the cost later

Once there is an award, section 5500.5(e) lets an employer held liable start contribution proceedings within one year to divide responsibility among the employers. That proceeding “shall not diminish, restrict, or alter in any way the recovery previously allowed the employee or his or her dependents . . .” If the Board finds that an employer previously held liable in fact has no liability, it may dismiss that employer and amend the award accordingly.

Facts that change the answer

No insured employer in the final year. If none of the employers in the one-year period had workers’ compensation coverage or an approved alternative, section 5500.5(a) moves liability to the last year of harmful employment in which an employer was insured. An employer held liable because another employer failed to insure may seek reimbursement from the uninsured employers.

One injury or several. Section 3208.1 defines a cumulative injury as repetitive traumatic activity over time whose combined effect causes disability or need for treatment. In our reading, whether years at different jobs produced one continuous injury or separate injuries is a medical and factual question, and the answer changes which year and which employers count.

No splitting by year. Once a cumulative injury is found, section 5500.5(a) bars apportioning liability to earlier or later years. Evidence of disability from a specific injury, a nonindustrial cause or an earlier award may still be considered in apportionment.

A missing employer. In Reed Johnson v. L.A. Dodgers, a retired baseball player named only the Dodgers, one of six teams (seven stints) the parties stipulated employed him during the claimed injury period. The last team, the only employer in his final year, was never joined, yet the trial judge decided the case on findings about that team. The Board rescinded the decision because an entity must be joined before a judgment is rendered for or against it, citing section 5500.5(b)’s joinder rules. It also found that nothing prevented joining that team. Professional athletes also face special out-of-state exemptions.

What to gather before you file or amend

• A work history with each employer’s legal name, address, worksite and start and end dates, including staffing agencies and second jobs.
• The last day you performed the tasks you believe caused the injury, and what you did at each job.
• The first medical report or note connecting your condition to work, and the first time you lost time or had work restrictions.
• Any insurer names on claim forms, posters or letters.
• Your application and any amendments, and any joinder or election documents already filed.

Compare the employers on your application with those inside the one-year window; a gap is easier to fix before the first hearing.