How 42 CFR 407.14 Defines the Initial Enrollment Period

42 CFR 407.14 defines the Initial Enrollment Period as a seven-month period around the month an individual first meets the eligibility requirements referenced in § 407.10 (42 CFR § 407.14). Medicare’s consumer materials describe a general age-65 example and an exception for a birthday on the first of a month.

This original record-reading guide is a general reading aid, not cited evidence. It does not depict a source record; the article text and source links provide the facts.

Key points

• 42 CFR § 407.14 defines the Initial Enrollment Period as a seven-month period around the first month an individual meets the referenced eligibility requirements.
• The Medicare & You 2026 handbook describes a general age-65 window and a first-of-the-month exception.
• Medicare.gov’s sign-up page describes an age-65 sign-up window in consumer-facing terms.
• This article covers only when the sign-up window opens and closes — not when coverage starts, whether a Special Enrollment Period might apply, or any individual’s Social Security enrollment status.

What the federal regulation says

The definition of the Initial Enrollment Period comes directly from federal regulation. Per 42 CFR § 407.14:

“The initial enrollment period is the 7-month period that begins 3 months before the month an individual first meets the eligibility requirements of § 407.10 and ends 3 months after that first month of eligibility.” — 42 CFR § 407.14

This is the regulation’s stated seven-month framing around the first month of eligibility.

What the handbook adds

The Medicare & You 2026 handbook, Medicare’s official consumer guide, restates the same window in birthday terms and adds an exception for people born on the first of the month:

“Generally, you can first sign up for Part A and/or Part B during the 7-month period that begins 3 months before the month you turn 65 and ends 3 months after the month you turn 65. If your birthday is on the first of the month, your 7-month period starts 4 months before the month you turn 65 and ends 2 months after the month you turn 65.” — Medicare & You 2026

The handbook states its age-65 guidance and names a specific exception tied to a birthday on the first of a month.

Medicare Sign-up

Medicare’s own consumer-facing sign-up page describes the same window, though the quoted passage below does not use the term “7-month” anywhere:

“Generally, you’re first eligible to sign up for Part A and Part B starting 3 months before you turn 65 and ending 3 months after the month you turn 65.” — When can I sign up for Medicare?

The sign-up page states the age-65 start and end points quoted above; this article does not treat that consumer wording as a substitute for the regulation’s eligibility-based definition.

What this article does not answer

This article states only when the Initial Enrollment Period itself opens and closes. It does not address when Medicare coverage actually begins once you sign up. It does not address whether a Special Enrollment Period might apply instead of the Initial Enrollment Period, which depends on circumstances not covered here. And it does not address any individual’s Social Security enrollment status, which is a separate matter from the enrollment window described above.

Source links

• https://www.ecfr.gov/current/title-42/section-407.14
• https://www.medicare.gov/publications/10050-medicare-and-you.pdf
• https://www.medicare.gov/basics/get-started-with-medicare/sign-up/when-can-i-sign-up-for-medicare