Colorado’s SB 26-184 cleared both legislative chambers this week and is heading to the governor’s desk. The bill passed the House 42-23 on May 12 and received Senate concurrence 35-0 on May 13. If signed as expected, it takes effect August 12, 2026, and will expand the list of occupational diseases presumed to arise from firefighting, add neurological conditions including Parkinson’s disease, and raise the standard employers must meet to rebut the presumption.
For self-insured municipalities, counties, and fire protection districts that carry firefighter workers’ comp exposure, the bill changes the math on three fronts at once: what counts as a covered disease, who qualifies, and how hard it is to contest a claim.
What the bill does
SB 184 makes three structural changes to Colorado’s firefighter presumption statute.
Broader disease list. The bill replaces the current organ-system cancer categories with site-specific classifications covering malignant neoplasms of the oral cavity, respiratory system, digestive tract, and lymphatic and hematologic systems. It also adds neurological conditions, including Parkinson’s disease, to the presumption for the first time.
Higher rebuttal standard. Employers currently can rebut the presumption that a disease arose from firefighting by showing a preponderance of the medical evidence. SB 184 raises that bar to “clear and convincing evidence,” a standard that is materially harder to meet and that courts apply more skeptically.
Eligibility rules. Active firefighters need five years of service to qualify. Retired firefighters retain presumptive coverage for every year they served, capped at 10 years after retirement. Wildland firefighters and state-employed firefighters are excluded, concentrating the cost on municipal and district employers.
Four fiscal notes were generated between May 4 and May 8, signaling that the legislature’s own analysts projected significant cost impact on public employers.
Who it affects
The direct exposure falls on Colorado’s self-insured cities, counties, fire districts, and fire protection districts. Any public employer that funds firefighter WC claims through a self-insured retention, a public entity pool, or a captive will see the effect. The state-employee exemption means Colorado’s own budget is not on the hook, but local governments are.
How it hits reserves
Frequency. More diseases qualify, and the higher rebuttal standard makes denials harder to sustain. Both changes push accepted claim counts up. Employers that historically denied a meaningful share of occupational disease filings should expect that denial rate to compress.
Severity. Neurological conditions like Parkinson’s carry longer treatment durations, higher lifetime medical costs, and significant indemnity exposure through permanent total disability ratings. Adding these claims to the compensable pool raises the average cost per claim.
Development tail. Occupational cancers and Parkinson’s disease can emerge years or decades after exposure. Claims that would have been filed outside the current presumption window will now fall inside it, extending the development tail on open accident years. Self-insured programs that assumed a stable tail length for firefighter claims will need to revisit that assumption.
What this means for your next review
If you carry firefighter WC exposure in Colorado, flag SB 184 for your actuary before your next reserve study. The conversation should cover three things: an updated frequency assumption that reflects both the expanded disease list and the rebuttal standard shift; a severity load for neurological conditions that were previously outside the compensable universe; and a longer development tail for occupational disease accident years that accounts for late-emerging Parkinson’s and site-specific cancer diagnoses. Programs that benchmark to NCCI or state loss cost data should note that voluntary market data will lag this change by at least a year.