To amend title 5, United States Code, to include Parkinson's disease in the list of illnesses and diseases deemed to be proximately caused by employment in fire protection activities, and for other purposes.

H.R. 4453 would add Parkinson's disease to the list of illnesses that are deemed proximately caused by employment in fire protection activities under 5 U.S.C. § 8143b(b)(2). In practical terms, this means Parkinson's disease would be treated as job-related for federal employees in firefighting and similar fire protection roles, triggering the existing workplace-connection presumption used for federal workers' compensation claims. The bill accomplishes this by inserting a new item (L) for Parkinson's disease into the enumerated list and renumbering subsequent items accordingly. The measure is brief and narrowly focused, with no accompanying funding or policy changes beyond this addition. It was introduced July 16, 2025, and referred to the House Committee on Education and Workforce.