Newsroom · Monticello
Medicare Enrollment Periods in 2026: A Monticello Guide
IEP, SEP, GEP, AEP — Medicare's alphabet of deadlines decides when your coverage starts and whether you pay a penalty for life. Here's each window in plain English.
The bottom line
- Medicare has five main enrollment windows — your one-time IEP at 65, event-based SEPs, the January–March GEP catch-up, the fall AEP, and the January–March MA OEP.
- Working past 65 with employer coverage? You get an 8-month Special Enrollment Period when the job or coverage ends — penalty-free. COBRA does not count.
- Missed everything? The General Enrollment Period (Jan 1 – Mar 31) is your catch-up — coverage now starts the month after you sign up, but a lifelong Part B penalty of 10% per 12 months missed can ride along.
- In 2026 the standard Part B premium is $202.90/month — the base every penalty percentage is applied to.
- San Juan County carries the area's highest chronic-condition load (high blood pressure 34.6%, diabetes 13.7%) — one more reason to use the right window and get plan fit, not just any plan.
Medicare gives you five different enrollment windows, and picking the right one decides when your coverage starts — and whether you pay a penalty for the rest of your life. Your Initial Enrollment Period at 65 comes first; Special Enrollment Periods cover life events like retiring; and the General Enrollment Period each January–March is the catch-up lane. This guide walks Monticello and San Juan County residents through all five, with the official rules linked at every step.
Which Medicare enrollment window applies to me?
Match your situation to the window — each has its own dates, rules, and consequences:
| Window | When | What it does | Type |
|---|---|---|---|
| Initial Enrollment Period (IEP) | 7 months around your 65th birthday | Your one-time first window for Parts A & B. Enroll in the 3 months before your birthday month for gap-free coverage. | Once |
| Special Enrollment Period (SEP) | 8 months after employer coverage or the job ends | Penalty-free sign-up if you delayed Medicare because you (or your spouse) kept working with group coverage. | Event |
| General Enrollment Period (GEP) | January 1 – March 31, every year | The catch-up window if you missed your IEP and no SEP applies. Coverage starts the month after you sign up; late penalties may apply. | Catch-up |
| Annual Enrollment Period (AEP) | October 15 – December 7, every year | Everyone on Medicare can join, drop, or switch Medicare Advantage and Part D plans for January 1. | Yearly |
| MA Open Enrollment (MA OEP) | January 1 – March 31, every year | Already on Medicare Advantage? One switch to another Advantage plan or back to Original Medicare. | Yearly |
Windows and dates: Medicare.gov — When can I sign up for Medicare? and Medicare.gov — Joining a health or drug plan.
What if I'm still working at 65?
This is the most common Monticello question — and the most common place people get tripped up. If you (or your spouse) are actively working and covered by that employer's group health plan, you can usually delay Part B without penalty. When the employment or the coverage ends — whichever comes first — an 8-month Special Enrollment Period opens for you to sign up penalty-free, and coverage starts the month after Social Security processes your forms.
Three cautions from the official rules:
- COBRA and retiree coverage don't count as active employer coverage. Your 8-month clock starts when the job stops — even if you take COBRA after.
- Small employers are different. If the company has fewer than 20 employees, Medicare generally pays first — delaying Part B can leave you with big gaps.
- Part D has its own clock. Go 63 or more days without creditable drug coverage and a separate, permanent Part D penalty can start building.
Source: Medicare.gov — Special Enrollment Periods and Medicare.gov — Avoid late enrollment penalties.
What happens if I missed my window entirely?
You're not locked out — you're rerouted. The General Enrollment Period runs January 1 – March 31 every year, and since a 2023 rule change your coverage starts the first of the month after you sign up (sign up in February, covered March 1 — no more waiting until July). The catch is the penalty: unless an SEP applies, Part B costs an extra 10% of the standard premium for each full 12-month period you went without it, and that surcharge lasts as long as you have Part B.
GEP dates & coverage start: Medicare.gov — When does Medicare coverage start?. SEP: Medicare.gov — Special Enrollment Periods. Penalty rule: Medicare.gov — Avoid late enrollment penalties. 2026 premium: CMS — 2026 Medicare Parts A & B Premiums and Deductibles.
Not sure which window you're in?
Tell Brian your birthday, your work situation, and your current coverage, and he'll pin down your exact window and deadline — free, local, no pressure. The Monticello office is at 65 S Main St.
Find my enrollment window →Why does the right window matter so much in San Juan County?
Because a late or rushed enrollment usually means settling for whatever plan is easiest instead of the plan that fits your health. San Juan County adults carry the heaviest chronic-condition load in our service area:
Chronic-condition rates among San Juan County adults
Source: CDC PLACES, 2023 — via the Medicare On Main Data Desk. Model-based prevalence among adults, 2023.
With 34.6% of adults managing high blood pressure and 13.7% living with diabetes, the drug formulary and specialist network in your plan matter more than the headline premium. Enrolling in the right window — with time to compare — is how you protect that fit.
What should I do next?
- Pin down your window. Turning 65 soon? Mark your 7-month IEP. Working past 65? Note that your 8-month SEP starts when the job or coverage ends.
- Never assume COBRA protects you. It doesn't stop the penalty clock — check the rules before you rely on it.
- If you've already missed your window, plan for the next GEP (January 1 – March 31) and budget for a possible penalty.
- Compare plans on the official tool — medicare.gov/plan-compare lists every plan available in San Juan County.
- Bring your dates to a local review. A five-minute check of your timeline is free and can prevent a lifelong surcharge.
How we know all this: the Medicare On Main Data Desk frames every article with public data — here, enrollment rules and dates from Medicare.gov and CMS, and county health figures from CDC PLACES (2023) — and qualitative guidance for anything (like specific plan counts and premiums) that changes year to year. This is education, not advice; confirm your window, costs, and eligibility with a licensed agent or Medicare.gov. We take no payment from any carrier to feature a plan.
Frequently asked questions
What are the main Medicare enrollment periods in 2026?
There are five windows most Monticello residents should know: your one-time Initial Enrollment Period (the 7 months around your 65th birthday); Special Enrollment Periods for life events like retiring from a job with health coverage; the General Enrollment Period (January 1 – March 31 each year) if you missed your first window; the Annual Enrollment Period (October 15 – December 7) to change Medicare Advantage or Part D plans for the next year; and the Medicare Advantage Open Enrollment Period (January 1 – March 31) for one switch if you're already on an Advantage plan.
I missed my Initial Enrollment Period — what happens now?
You can sign up for Part A and/or Part B during the General Enrollment Period, January 1 – March 31 each year, and your coverage starts the month after you sign up. Unless you qualify for a Special Enrollment Period, you may also owe a late-enrollment penalty — for Part B it's an extra 10% of the standard premium for each full 12-month period you went without it, and it lasts as long as you have Part B.
I'm still working at 65 in San Juan County — do I have to sign up?
Usually not right away. If you (or your spouse) are actively working and you're covered by that employer's group health plan, you can typically delay Part B without penalty. When the job or the coverage ends, an 8-month Special Enrollment Period opens to sign up penalty-free. Two cautions: COBRA and retiree coverage do NOT count as active employer coverage for this rule, and small-employer plans (under 20 employees) may pay secondary to Medicare — so confirm your situation before you delay.
When does my coverage start if I use the General Enrollment Period?
Since a 2023 rule change, GEP coverage starts the first day of the month after you sign up — you no longer wait until July. Sign up in February, for example, and coverage begins March 1. Any Part B late-enrollment penalty still applies on top of the standard premium.
What's the difference between AEP and the Medicare Advantage Open Enrollment Period?
The Annual Enrollment Period (October 15 – December 7) is open to everyone on Medicare: you can join, drop, or switch Medicare Advantage and Part D plans, with changes effective January 1. The Medicare Advantage Open Enrollment Period (January 1 – March 31) is only for people already enrolled in a Medicare Advantage plan — it allows one switch to another Advantage plan or back to Original Medicare, but you cannot use it to move from Original Medicare into an Advantage plan.
Does Medicare On Main charge for help sorting out my enrollment window?
No. Brian Penner is an independent, licensed Medicare advisor — paid by the carriers, not by you. Guidance is free, there's no pressure to enroll, and the Monticello office is at 65 S Main St.
Sources
- Medicare.gov — When can I sign up for Medicare? — IEP, GEP, and SEP definitions and dates.
- Medicare.gov — When does Medicare coverage start? — when coverage begins for each window, including the month-after GEP rule.
- Medicare.gov — Special Enrollment Periods — the 8-month employer-coverage SEP and other qualifying events.
- Medicare.gov — Avoid late enrollment penalties — the Part B 10%-per-year and Part D 63-day penalty rules.
- CMS — 2026 Medicare Parts A & B Premiums and Deductibles — 2026 standard Part B premium of $202.90/month.
- CDC PLACES: Local Data for Better Health, County 2023 — San Juan County chronic-condition prevalence (2023).