This subchapter provides rules to interpret, implement, and enforce Insurance Code Chapter 1355, Subchapter F, concerning Coverage for Mental Health Conditions and Substance Use Disorders. Except as identified in §21.2404 of this title (relating to Differences from Federal Rules), these rules are intended to be consistent with the Insurance Code and to closely track the federal rules found at 45 CFR §146.136 (concerning Parity in Mental Health and Substance Use Disorder Benefits), 45 CFR §146.121(b)(2)(iii) (concerning Prohibiting Discrimination Against Participants and Beneficiaries Based on a Health Factor), and 45 CFR §147.160 (concerning Parity in Mental Health and Substance Use Disorder Benefits) as published in the Federal Register, Vol. 78, No. 219 on November 13, 2013.