S.D. Codified Laws § 58-17-142
Any carrier of any in force individual health benefit plan issued guarantee issued policies prior to August 1, 2003, for which rates are established pursuant to § 58-17-75, may set and charge a maximum premium rate of not more than two and two-tenths times the base premium rate until January 1, 2005, and may set and charge a maximum premium rate of not more than two and one-half times the base premium rate for each year thereafter, if the carrier actively markets individual major medical policies in this state during the entire year of 2003 and each year thereafter. If, in any year after 2003, the carrier discontinues actively marketing individual health benefit plans in this state, the premium rate provisions of § 58-17-75 apply to those policies in force issued guarantee issued policies from the date of the carrier's discontinuance of active marketing.
The provisions of this section apply only to grandfathered plans pursuant to 75 Fed. Reg. 116 (2010) to be codified at 26 C.F.R. §§ 54 and 602, as of January 1, 2015, and 29 C.F.R. § 2590, as of January 1, 2015, and 45 C.F.R. § 147, as of January 1, 2015.
SDCL 58-17-142