Relating to health benefit plan coverage of prescription drugs for opioid and substance use disorders.

HB 2528 requires most health insurance plans in Texas to cover specific medications for opioid and substance use disorders, including methadone, buprenorphine, and naltrexone. It applies to nearly all health benefit plans - such as individual/group insurance, HMOs, and health care programs - offered to Texas residents. The bill defines "medication-assisted treatment" and mandates coverage for these therapies without prior authorization or excessive cost-sharing. This policy directly affects patients seeking treatment and health insurers providing coverage in Texas. The bill does not apply to pharmacy-only services or certain specialized plans like standalone pharmacy benefit managers.