The four Marketplace categories, in HealthCare.gov's own grouping. Losing health coverage, which includes losing job-based, individual or student coverage, losing eligibility for Medicare, Medicaid or the Children's Health Insurance Program, and turning 26 and coming off a parent's plan. Changes in household, meaning marriage, divorce, a birth, an adoption, or a death in the family. Changes in residence, including a move to a different county or ZIP code, a student moving to or from the place they study, and a move to or from a shelter or transitional housing. And other qualifying events, a shorter list that covers a change in income affecting the coverage you qualify for, becoming a United States citizen, leaving incarceration, gaining membership of a federally recognised tribe, and starting or ending AmeriCorps service.
🔑 The clock is not a single number, and 45 C.F.R. 155.420 sets out at least three of them. The general rule at paragraph (c)(1) is 60 days from the triggering event. Where the trigger is a loss of coverage, paragraph (c)(2) gives 60 days before the event as well, which is what lets someone who knows their coverage ends on the 31st arrange a replacement that starts on the 1st. And since 2024 an Exchange may give up to 90 days after a loss of Medicaid or Children's Health Insurance Program coverage, longer still where the state runs a lengthier reconsideration period. There is also a protective rule for someone who was reasonably unaware the event had happened, running 60 days from when they knew or should have known.
⚠️ One Marketplace trigger has a condition attached that almost nobody states: marriage. Under 45 C.F.R. 155.420(d)(2)(i)(A), at least one spouse must demonstrate having had minimum essential coverage for one or more days during the 60 days preceding the wedding. Two people who were both uninsured when they married do not get a special enrollment period on that ground, which is the opposite of the general advice that marriage always opens one.
🔴 An employer's pre-tax benefits run on a different list entirely. Where coverage is paid for by salary reduction through a cafeteria plan, the governing rule is Treasury Regulation section 1.125-4, and its permitted events are changes in status: legal marital status, including marriage, divorce, legal separation, annulment and the death of a spouse; the number of dependents, through birth, death, adoption or placement for adoption; and employment status, including a termination or start of employment, a strike or lockout, the start of or return from unpaid leave, and a change of worksite. Two further constraints apply on top. The consistency rule at paragraph (c)(3) requires the change to be on account of and correspond with the event, so a marriage supports adding a spouse and does not support dropping dental cover. And paragraph (a) states that "section 125 does not require a cafeteria plan to permit any of these changes", so the plan document decides whether the option exists at all.
A third regime governs group health plans themselves. HIPAA special enrollment rights at 29 U.S.C. 1181(f) require a group plan to let an employee or dependent enroll after losing other coverage, and the request must be made "not later than 30 days" after the loss. ⚠️ Read the condition precisely: where the prior coverage was COBRA, the right arises on exhaustion of that coverage, not on choosing to stop paying for it. That single word is why dropping COBRA mid-term so often leaves someone with no route into any plan.
Some things need no event at all. Medicaid and the Children's Health Insurance Program accept applications year-round, so a household that may qualify never has to wait for a window or a trigger. And a voluntary decision to drop coverage is generally not a qualifying event in any of the three systems, which is the mirror image of the rule that an involuntary loss is.