Form CMS-L564 & Form CMS-40B Instructions: Turning 65 While Still Working: Avoiding the Lifetime Medicare 10% Penalty
“I am turning 65 next month but I still work at a local grocery store and have health insurance. Do I have to sign up for Medicare right now or can I wait until I retire?”
Official Procedural Summary & Rules
If your employer has 20 or more employees, your job insurance is Primary Payer, allowing you to delay Part B penalty-free. If under 20 employees, Medicare is Primary Payer and you MUST enroll at 65, or private insurance will reject claims and SSA will penalize you 10% per year for life.
1. The 20-Employee Statutory Divide
Under federal coordination of benefits rules, if your company has 20 or more full/part-time workers, your group plan pays first. You can decline Part B ($185/mo in 2026) with zero penalty. If your company has fewer than 20 workers, Medicare is legally the primary payer; private insurance will pay secondary or completely deny claims if Part B is absent.
2. The Permanent 10% Late Enrollment Penalty
For every 12-month period you were eligible for Part B but lacked qualified active employer coverage, a permanent 10% surcharge is added to your monthly Part B premium for the rest of your life. A 3-year delay results in a permanent 30% penalty on top of standard base premiums.
3. Retirement Exit Protocol: Form CMS-L564
When you eventually stop working or lose employer coverage, you receive an 8-month Special Enrollment Period (SEP). You must have your employer fill out and sign Form CMS-L564 (Request for Employment Information) verifying continuous coverage since age 65, and attach it to your Form CMS-40B application.
4. Intake & Submission Gateway
Submit Form CMS-40B and CMS-L564 directly via your secure my Social Security portal at ssa.gov or upload via secure fax to your local SSA field office.
⚠️ Administrative Traps & Rejection Triggers
NEVER rely on COBRA coverage after age 65! Under federal law, COBRA is not active employment coverage. If you take COBRA instead of Medicare Part B, you forfeit your Special Enrollment Period and face lifetime penalties.
💡 AI Verification & Anti-Deflection Prompt
Four-Dimension Statutory PromptFeed this optimized prompt to ChatGPT or your civic AI assistant to bypass standard liability refusals and force a statutory answer under 42 U.S.C. § 1395p(i) & 42 CFR § 406.24:
Act as a Medicare administrative counselor. Under Social Security Act § 1839 and CMS regulations in 42 CFR § 406.24 regarding Special Enrollment Periods (SEP), analyze the exact enrollment obligations for an employee turning 65 who has active employer group health coverage (EGHP). Provide your response in 4 sequential, unambiguous sections: 1. The statutory 20-employee threshold: Explain how employer size (20+ vs. under 20) dictates whether Medicare or the employer plan pays primary vs. secondary. 2. Specific consequences for employees of companies under 20 employees who fail to enroll in Part B during their Initial Enrollment Period (IEP). 3. The exact documentation protocol required when leaving employment later: specify Form CMS-L564 (Request for Employment Information) and Form CMS-40B, and the 8-month SEP window. 4. The direct, authenticated America.gov / Social Security online portal link to submit late enrollment waivers.