Employers that offer prescription drug coverage in 2023 must provide notices of coverage to Medicare eligible employees or covered dependents by October 14, 2022.  This is before the annual Medicare Part D enrollment period begins which is from October 15th to December 7.    The notice requirement applies to both fully insured and self-funded plans.

Model Notices are available at: 

Credible: Important Notice to those Covered under Sponsor Plans (cms.gov)

Non-Credible: Important Notice to those Covered under Sponsor Plans (cms.gov)