Guadalupe Gutierrez worked for almost 40 years as a cemetery groundskeeper in Colma for Hills of Eternity/Home of Peace Management Group. American Family Home Insurance Company (AFH) insured the employer during calendar year 2014, and Insurance Company of the West (ICW) insured it during 2015. Gutierrez had three claims pending. The first was an admitted specific back injury on April 12, 2015, for which ICW furnished benefits. The second was a cumulative trauma claim, filed in November 2016, alleging back injury over the year ending April 12, 2015. The third was a separate claim that was ultimately denied.

In October 2019, Gutierrez elected on the record to proceed against AFH on the cumulative trauma claim under Labor Code § 5500.5(c). In a February 3, 2020 report, the agreed medical evaluator, Dr. William Campbell, concluded that Gutierrez had suffered specific injuries on January 1 and April 12, 2015. He also concluded that the back condition reflected cumulative trauma over almost four decades of heavy work, during which Gutierrez had worked through many unreported smaller injuries. In a later report, Dr. Campbell addressed whether Gutierrez’s harmful exposure ended in November 2015 or continued until he stopped working on April 27, 2016. He pointed to treatment records showing that all work restrictions were lifted from November 3, 2015 onward, and concluded the exposure continued through April 27, 2016.

In a November 2022 decision, the workers’ compensation judge (WCJ) found both the specific injury and the cumulative trauma injury compensable. For the cumulative trauma claim, the WCJ used the pleaded end date of April 12, 2015 to set the one-year liability period under § 5500.5. The WCJ did not include a formal finding on the date of injury under Labor Code § 5412. However, the WCJ’s opinion reasoned that because Gutierrez had a disabling specific injury on April 12, 2015, he must have known that same day that his disability was work-related. The WCJ awarded 46 percent permanent disability, future medical care, and attorney fees on the cumulative trauma claim against the employer, AFH, and ICW jointly and severally. The WCJ deferred the questions of which insurer would administer benefits and how the insurers would share costs.

AFH petitioned for reconsideration. It argued that both the last date of harmful exposure and the date of injury fell in April 2016, which would put the liability period entirely outside AFH’s 2014 coverage. ICW petitioned separately, arguing that Gutierrez’s 2019 election against AFH meant AFH alone should be liable, so the administration and contribution issues should not have been deferred.

In the panel decision of Guadalupe Gutierrez v. Hills of Eternity/Home of Peace Management Group, ADJ10656667, ADJ10656647, ADJ13080462 (September 2026), the Board panel (Deputy Commissioner Anne Schmitz, Chair Katherine A. Zalewski, and Commissioner JosÉ H. Razo) rescinded the WCJ’s decision and substituted new findings on the cumulative trauma claim. The last day of harmful exposure is April 27, 2016. The § 5412 date of injury is February 3, 2020. The § 5500.5 liability period is the 365 days ending April 27, 2016. The panel removed AFH from the award and made the award, including the 46 percent permanent disability, joint and several against the employer and ICW only. It deferred all other issues on that claim and returned the matter to the trial level. The WCJ’s findings on the specific injury and the denied third claim were carried forward.

On the end of the exposure period, the panel noted that § 5500.5(a) limits cumulative trauma liability to employers and insurers during the year before the last date of harmful exposure or the § 5412 date of injury, whichever comes first. Dr. Campbell had squarely addressed whether the exposure ended in November 2015 or April 2016. Because his opinion, and the work-status records it relied on, were uncontroverted, the panel saw no good reason to reject it. It cited Power v. Workers’ Comp. Appeals Bd. (1986) 179 Cal.App.3d 775 and fixed the last exposure date at April 27, 2016.

On the date of injury, the panel held that the WCJ applied the wrong test. A cumulative trauma injury, as defined in Labor Code § 3208.1, occurs when its combined effect ripens into compensable disability and the worker knows, or reasonably should know, that the disability was caused by work. The panel relied on Federal Ins. Co. v. Workers’ Comp. Appeals Bd. (2013) 221 Cal.App.4th 1116 and State Comp. Ins. Fund v. Workers’ Comp. Appeals Bd. (Rodarte) (2004) 119 Cal.App.4th 998. Knowing that a specific incident was work-related is not the same as knowing that years of cumulative trauma caused a disability. Under City of Fresno v. Workers’ Comp. Appeals Bd. (Johnson) (1985) 163 Cal.App.3d 467, a worker is generally not presumed to have that knowledge without medical confirmation. The panel found no evidence that Gutierrez knew or should have known of a disabling cumulative injury before Dr. Campbell’s February 3, 2020 report. Because the April 27, 2016 exposure date came first, it controls the liability window.

On ICW’s argument, the panel agreed with the WCJ. Under § 5500.5(c) and Colonial Ins. Co. v. Industrial Acc. Com. (Pedroza) (1946) 29 Cal.2d 79, an injured worker may elect to proceed against any one of several liable insurers. But that election does not relieve any other insurer of its liability, so deferring administration and contribution was proper. The panel then noted that its own findings moved the liability period entirely outside AFH’s 2014 coverage, so the record no longer supported any award against AFH. That left ICW, which covered 2015, jointly liable with the employer. The panel added that ICW may still identify whichever insurer covered the employer in 2016, join it in the case, and seek contribution.