US · guidance
CMS Pub. 100-01, ch. 2, § 40.3.3
Enrollment During the Special Enrollment Period (SEP)
Related to Coverage Under Group Health Plans
(Rev. 12046, Issued:05-18-23, Effective:01-01-23, Implementation:06-21-23)
If an individual enrolls in SMI or premium HI while still covered under a GHP or LGHP
or during the first full month when not enrolled in a GHP/LGHP based on current
employment status, coverage begins either with:
• The first day of the month of SMI or premium HI enrollment, or
• At the individual's option, with the first day of any of the following 3 months.
If the individual enrolls during any of the 7 remaining months of the special enrollment
period, coverage begins with the first day of the month following the month of
enrollment.
History
(Rev. 12046, Issued:05-18-23, Effective:01-01-23, Implementation:06-21-23)
Provenance
- Source
- cms.gov
- Retrieved
- 2026-08-25
- Edition
- iom-2026-08-25
- Content hash
8a86ccbbda033ab2ba09f9d2d1a4aab49744440412e2974a54048c7776ea332b
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