IL HB4429

Health insurance policies issued, amended, delivered, or renewed on or after January 1, 2027 cannot limit or alter coverage based solely on an insured's weight or body mass index.

Physicians are prohibited from making diagnoses or treatment determinations based solely on a patient's BMI.

Hospitals must post notices at all publicly accessible entrances informing patients of their right to treatment regardless of BMI and their right to know how weight factored into their diagnosis or treatment.

Healthcare providers conducting medical, behavioral, or psychological assessments must use only peer-reviewed clinical practice guidelines or evidence-based methodologies recognized by professional organizations.

The bill explicitly preserves the use of BMI in combination with other factors like blood pressure and cholesterol for diagnosis or treatment purposes.