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Letter Guide Medicare Part B
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Medicare Part B Penalty Notice

What It Means & What to Do

⚠️ This Penalty Is PERMANENT — But You May Qualify for an Exception. Read below.

Why You Received This Letter

This letter means Medicare is adding a late enrollment penalty to your Part B premium — and this penalty lasts for as long as you have Part B. It's assessed because you didn't sign up during your Initial Enrollment Period or a Special Enrollment Period.

The penalty is 10% of the standard premium ($202.90 in 2026) for every full 12-month period you were eligible but didn't enroll.

BUT — if you had employer coverage during the gap, you may qualify for a Special Enrollment Period and the penalty can be removed.

Common Reasons You Got This Letter

❌ Didn't enroll during Initial Enrollment Period

The Initial Enrollment Period is 3 months before to 3 months after you turn 65. If you missed it, you're subject to the penalty (unless you had employer coverage).

❌ Gap between employer coverage ending and Part B starting

You left your job or lost employer coverage, but didn't enroll in Part B within 8 months. This triggers the penalty.

❌ Missed General Enrollment Period

General Enrollment runs January 1 to March 31 each year. Coverage starts July 1. If you missed this window, you waited too long.

❌ Didn't know employer coverage triggered a Special Enrollment Period

Many people think that having employer coverage means they don't need Medicare — which is true. But they don't realize that when that coverage ends, they have only 8 months to enroll in Part B without penalty.

What to Do Now: 5-Step Action Plan

  1. Calculate your penalty: Count the full 12-month periods you were eligible but not enrolled. Multiply by 10% of the standard premium ($202.90 × 10% = $20.29 per 12-month period in 2026). See the table below for examples.
  2. Check if you had employer group health coverage during the gap: If YES, you may qualify for a Special Enrollment Period and penalty removal. If NO, skip to step 4.
  3. If you had employer coverage: Get Form CMS-L564 signed by your employer proving your coverage dates (start and end). Then file Form CMS-40B to request Part B enrollment with penalty waiver.
  4. If you did NOT have coverage: You're stuck with the penalty, but file anyway to get enrolled. You can only enroll during General Enrollment (Jan-Mar), with coverage starting July 1.
  5. If you believe the penalty was assessed in error: Appeal within 60 days using the appeals process (see "Can I Appeal?" section below).
⏰ Act Quickly on the Special Enrollment Period

The Part B penalty is permanent, BUT if you qualify for a Special Enrollment Period, you have 8 months after employer coverage ends to enroll without penalty. After that, the penalty kicks in. Time is critical.

Penalty Calculation Examples (2026 Rates)

Use this table to estimate your penalty based on how long you were eligible but not enrolled:

Gap (Months Not Enrolled) Penalty Per Month (2026) Annual Extra Cost
12 months $20.29 $243.48
24 months $40.58 $486.96
36 months $60.87 $730.44
48 months $81.16 $973.92

Note: Penalty amounts increase slightly each year with the standard premium. These are 2026 rates only.

🔓 Special Enrollment Period Rules

▼

What is a Special Enrollment Period (SEP)?

If you lose employer group health coverage, Medicare gives you 8 months (without penalty) to enroll in Part B. This is called a Special Enrollment Period.

The 8-month window starts when:

  • Your employer coverage ends (not when COBRA ends — this is critical)
  • Your employment ends
  • You're no longer eligible for your employer's plan

Key rules:

  • Your employer must have 20+ employees for the coverage to count as employer coverage for Medicare purposes. Smaller employers may not qualify.
  • COBRA does NOT count as employer coverage. If you go on COBRA after leaving your job, your 8-month window STILL runs from when your employment ended, not when COBRA ends. This is one of the most common mistakes.
  • You must enroll in Part B within 8 months of your coverage ending.
  • If you enroll within the 8 months, you have no penalty — even if you waited the full 8 months.
  • If you enroll after 8 months, the penalty applies from month 1 of the gap.

How to prove you had employer coverage: Get Form CMS-L564 signed by your employer (Human Resources or Benefits department). This form documents your coverage dates. Submit it with Form CMS-40B to Social Security.

💳 How to Get the Penalty Removed

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If you qualify for a Special Enrollment Period, follow these steps:

  1. Get Form CMS-L564 from your employer. Contact your employer's HR or Benefits department and ask for this form. It must be signed by them and state your coverage dates (start and end date).
  2. Complete Form CMS-40B. This is the Application to Enroll in Part B. Include your employer's completed CMS-L564 with this form.
  3. Submit to your local Social Security office. You can:
    • Visit in person at ssa.gov/locator to find your nearest office
    • Mail it to your local Social Security office (address on the form)
    • Call 1-800-MEDICARE (1-800-633-4227) to ask about online submission
  4. Include a letter explaining your situation. Example: "I am applying for Medicare Part B under a Special Enrollment Period. I was covered by employer group health insurance from [start date] to [end date]. This application is being submitted within 8 months of my coverage ending. Please waive the late enrollment penalty."
  5. Keep copies of everything. Make copies of Form CMS-40B, Form CMS-L564, and your letter. Keep the originals for yourself.

Timeline: Processing typically takes 1-2 months. Part B coverage usually starts on the first day of the month following approval, or up to 3 months earlier depending on when you apply.

⚖️ Can I Appeal the Penalty?

▼

Yes, you can appeal, but you have only 60 days.

When to appeal:

  • You believe the penalty was calculated incorrectly
  • You believe you had good cause for not enrolling (rare, but possible)
  • You believe you had employer coverage that Medicare isn't recognizing
  • You never received proper notice of the penalty

How to appeal:

  1. Contact Social Security at 1-800-772-1213 (TTY 1-711) and ask to file an appeal.
  2. They will send you a Notice of Appeal Rights and Procedures.
  3. Request SSA Reconsideration — this is the first level of appeal.
  4. Submit written evidence supporting your case (proof of employer coverage, dates, good cause documentation, etc.).
  5. You have 60 days from the date on the letter to request an appeal.

Note: "Good cause" is hard to prove. Medicare rarely waives a penalty without employer coverage documentation. Your best option is the Special Enrollment Period with CMS-L564 proof.

🚨 CRITICAL: COBRA Does NOT Count as Employer Coverage for Medicare

This is the #1 mistake people make. You leave your job, go on COBRA for 18 months, then try to enroll in Part B — and you get hit with a penalty because COBRA doesn't count as employer coverage.

Here's what matters: Your 8-month Special Enrollment Period runs from when your EMPLOYMENT ended, NOT when COBRA ends. If you have COBRA, sign up for Part B within 8 months of your job ending, not when COBRA expires.

Example: You leave your job on June 1 and enroll in COBRA. Your 8-month window closes February 1 (the following year), even if your COBRA coverage extends to December 31. If you wait until March to enroll in Part B, you'll have a penalty.

💡 Dr. Ed's Insider Tip

The Part B penalty is one of the most common and most devastating Medicare mistakes I saw in 30 years. People turn 65, their HR department tells them they don't need Medicare because they have employer coverage — which is true. But nobody tells them they have only 8 months AFTER leaving that job to sign up for Part B without a penalty. If they wait 9 months, they're hit with a permanent 10% penalty.

Here's the key: COBRA is NOT employer coverage for Medicare purposes. I saw people leave their job, go on COBRA for 18 months, and then try to enroll in Part B — and they were hit with a penalty because COBRA doesn't count. If you have COBRA, sign up for Part B within 8 months of your EMPLOYMENT ending (not when COBRA ends).

And get that CMS-L564 signed by your employer BEFORE you leave the job. It's much harder to get later. Your HR department may refuse to sign it after you've separated, or the company may be hard to track down. Get it in writing while you're still employed.

📞 What to Say When You Call Social Security

"I received a notice that I have a Medicare Part B late enrollment penalty. I believe I qualify for a Special Enrollment Period because I had employer group health coverage from [start date] to [end date]. I'd like to submit Form CMS-40B and CMS-L564 to have the penalty removed. Can you confirm what I need to submit and where to send it?"

📚 Related Resources & Guides

Medicare Part B Guide — Full Overview Form CMS-40B Guide — How to Complete & Submit IRMAA Calculator — Medicare Premium Surcharges Medicare Penalties Navigator — All Penalties Explained Turning 65 Checklist — What to Do & When Letter Decoder — What Other Medicare Letters Mean

Next Steps

If you have employer coverage documentation, gather it now and file CMS-40B immediately. The 8-month Special Enrollment Period window closes quickly. If you've already missed it, appeal within 60 days if you believe the penalty is wrong.

Questions? Call 1-800-MEDICARE (1-800-633-4227) or visit your local Social Security office. Bring your penalty letter and any employer coverage documentation.

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