AB 1887: Prescription drug coverage for rare diseases.

The bill aims to improve healthcare coverage for individuals with rare diseases. It prohibits health plans from imposing prior authorization or step therapy for a drug approved for treating a rare disease if prescribed by a specialist with expertise in the condition and deemed medically necessary. The provision applies to drugs prescribed after January 1, 2027, unless a biosimilar, interchangeable biologic, or generic version is available. The bill also includes a state-mandated local program to prevent willful violations, making it a crime. No reimbursement is required for certain costs associated with implementing this new provision.