IL HB2541

Expands the legal definition of "developmental disability" in Illinois to explicitly include Prader-Willi syndrome, ensuring individuals with this condition qualify for developmental disability services

Requires the Department of Human Services to include Prader-Willi syndrome in any rules defining developmental disability or listing conditions eligible for departmental services

Exempts persons diagnosed with Prader-Willi syndrome from IQ or cognitive functioning assessments when determining eligibility for home-based and community-based services under the "severe and multiple impairments" category

Adds Prader-Willi syndrome to the list of conditions (alongside intellectual disability, cerebral palsy, epilepsy, and autism) that can constitute a substantial developmental disability for service eligibility purposes

Amends the Statute on Statutes to ensure all state rules, contracts, and documents referencing "developmental disability" automatically include Prader-Willi syndrome