Restrictions on coverage limitations. If a provision of the Insurance Code or Texas Department of Insurance regulations allows a health benefit plan issuer to place quantitative or nonquantitative treatment limitations on coverage for mental health and substance use disorder conditions, an issuer may apply the limitation only to the extent that the limitation does not violate the parity requirements of Insurance Code Chapter 1355, Subchapter F, concerning Coverage for Mental Health Conditions and Substance Use Disorders, and this subchapter.