Short answer: Creditable coverage is employer drug coverage that’s at least as good as standard Medicare Part D. Employers that cover Medicare-eligible people must tell them whether their drug coverage is creditable before October 15 each year, and must disclose creditable/non-creditable status to CMS within 60 days of the plan year start.
Medicare Part D “creditable coverage” means an employer’s prescription drug coverage is expected to pay, on average, at least as much as standard Medicare Part D coverage. It matters because a Medicare-eligible person who goes without creditable drug coverage for 63+ continuous days can owe a permanent Part D late-enrollment penalty, so they need to know where their employer coverage stands.
Employers that offer prescription drug coverage to any Medicare-eligible individuals (employees, spouses, dependents, or retirees) have two disclosure duties:
1. Notice to individuals: before October 15 each year. Employers must give Medicare-eligible plan members a written notice stating whether the drug coverage is creditable or non-creditable, timed before the Medicare annual enrollment period (which begins October 15). Notice is also required at certain other times, such as before an individual’s initial Part D enrollment.
2. Disclosure to CMS: within 60 days of the plan year start. Employers must report creditable/non-creditable status to CMS through the online disclosure form within 60 days after the plan year begins (and within 30 days of any change).
Note that the method for testing creditability is tightening as Part D benefits richen: a revised “simplified determination” standard applies, and employers should re-test creditability each year rather than assume last year’s result still holds.
Sources
- Medicare Part D creditable coverage rules; CMS Creditable Coverage guidance and online disclosure.
- See the Employee Benefits KB (Compliance / Medicare-Eligible Employees) for the annual testing detail.
Content history
Originally published: June 16, 2026
Last reviewed: June 16, 2026