Medicare Enrollment Window and Start Date
Which Medicare Part B enrollment window is open on a date, and when coverage starts.
Open the tool → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Date of birth
- 1961-07-01
- Date of signing up or to check
- 2026-05-10
Result: Initial enrollment period, March 1, 2026 to September 30, 2026, is open: signing up on May 10, 2026 starts coverage June 1, 2026.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Date of birth (YYYY-MM-DD)
- Disability: first month of eligibility (YYYY-MM-DD)
- Date of signing up or to check (YYYY-MM-DD)
- Last day of employer coverage from current work (YYYY-MM-DD)
How this is calculated
Citation
20 CFR 404.2(c)(4) (age attained the day before the birthday); 42 CFR 407.14 (7-month initial period), 407.15 (general period January to March), 407.25 (start dates since 2023), 406.24 (special period to the 8th month without employer coverage). Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.