New Mexico has a unique exchange; the state runs the small business portion, and while the individual exchange is also technically state-run, Healthcare.gov is used to enroll people in individual insurance (ie, a federally-supported state-based marketplace). But the exchange is planning to establish its own enrollment platform that will be in use by the fall of 2020.
Normally I'd just use a snippet of the entry, but Norris manages to cover all the relevant angles in just a few paragraphs; I think she'll be OK with me cribbing more of it:
Initially, the state had planned to establish a state-run website for individual enrollments fairly soon after the exchanges went live in the fall of 2013, and that was still in the works until early spring 2015. But in April 2015, the exchange board voted to continue to use Healthcare.gov, as that was viewed as the less-costly alternative.