Short answer: HIPAA guarantees that employees moving between group plans can’t be denied coverage for health reasons, and it gives special-enrollment rights when someone loses other coverage or gains a dependent.
HIPAA’s portability protections smooth transitions between group health plans: a new employer’s plan can’t refuse to cover someone, or carve out their conditions, based on health status. HIPAA also created special enrollment periods, so an employee who loses other coverage or gains a dependent (through marriage, birth, or adoption) can enroll outside the normal open-enrollment window. Together these rules keep people from falling into coverage gaps when they change jobs or experience life events.
Sources
ERISA §702 / HIPAA (29 U.S.C. 1182) — a group health plan may not establish eligibility rules based on a health status-related factor, so a new employer’s plan can’t deny coverage or carve out a condition for health reasonslaw.cornell.edu/uscode/text/29/1182ERISA §701(f) / HIPAA (29 U.S.C. 1181) — special enrollment periods let an employee who loses other coverage or gains a dependent (marriage, birth, adoption) enroll outside open enrollmentlaw.cornell.edu/uscode/text/29/1181