A downward approved deviated single account case rate as determined in § 3.5609 of this title (relating to Notice of Change of Insurer on Deviated Presumptive Rates Required) remains with the case, regardless of any change of insurers, and shall continue for a period equal to the experience period on which it was based, not to exceed three years, subject however to the provisions of § 3.5608 of this title (relating to Annual Review of Approved Deviated Rates).
28 Tex. Admin. Code § 3.5606