Glossary
Social Security (and Medicare Enrollment)
The Social Security Administration handles Medicare enrollment, premium collection, and IRMAA determinations — even though Medicare itself is run by CMS.
Also known as: SSA, Social Security Administration, Social Security and Medicare
Quick answer
The Social Security Administration (SSA) is the federal agency that determines Medicare eligibility, processes Medicare enrollment applications, deducts Medicare premiums from Social Security benefits, and assesses IRMAA surcharges. The Centers for Medicare & Medicaid Services (CMS) runs the Medicare program itself, but SSA is the front door for enrollment and premium administration.
Why it matters
If you're not already receiving Social Security benefits at 65, no one will enroll you in Medicare automatically. You must actively file with SSA — online at ssa.gov, by phone (1-800-772-1213), or in person at a Social Security office. Missing this step is the #1 reason retired veterans accidentally miss their IEP.
Why this matters at age 65
Many retired military beneficiaries delay claiming Social Security until full retirement age (66-67) or age 70 for maximum benefit. That's a perfectly fine financial strategy — but it means Medicare enrollment will NOT happen automatically at 65. You must separately file the Medicare-only application.
When you'll encounter it
File for Medicare 3 months before your 65th birthday at ssa.gov/medicare. Premium deductions and IRMAA notices come from SSA each year.
Impact on Medicare
SSA is your interface for enrollment, premium payment, and benefit verification. Your Medicare premiums (Part B and any IRMAA) come out of your Social Security check if you're receiving benefits — otherwise, Medicare bills you quarterly or via Medicare Easy Pay.
Impact on TRICARE For Life
SSA does not administer TFL — but a SSA enrollment error (wrong Part B effective date, missing IRMAA appeal) can disrupt TFL through DEERS. Always verify Medicare data in milConnect after SSA changes.
Military-specific context
Military retired pay is administered by DFAS, not SSA. They're entirely separate systems, but BOTH count as taxable income for IRMAA. Many retirees underestimate this and are surprised by their IRMAA notice.
Common misconceptions
- "If I claim Social Security at 70, my Medicare auto-enrolls at 70." — Medicare enrollment is independent of Social Security claiming. Enroll in Medicare at 65 regardless of when you start SS benefits.
- "TRICARE pays my Medicare premiums." — It does not. SSA collects Part B premium directly from you (or your SS check).
Common mistakes to avoid
- Assuming Medicare enrollment is automatic at 65 when you haven't yet filed for Social Security benefits.
- Filing for SS benefits but skipping the Medicare portion of the application (it's a separate question).
- Not setting up Medicare Easy Pay when you delay SS benefits — quarterly invoices are easy to miss.
Real-world scenario: A retired Marine colonel plans to delay Social Security until age 70 for a larger benefit. He turns 65 and does nothing, assuming everything is automatic.
Nine months later he discovers he was never enrolled in Medicare — TFL is terminated. He must wait until the next GEP, enroll with a permanent Part B late penalty, and pays civilian medical bills out of pocket during the gap.
What should I do?
- 1Create a my Social Security account at ssa.gov well before 65 — it's needed for online Medicare enrollment.
- 2If delaying SS benefits past 65, file the Medicare-only application 3 months before your 65th birthday.
- 3Set up Medicare Easy Pay if you're not yet receiving SS — avoids missed quarterly invoices.
- 4Open every SSA letter the moment it arrives — IRMAA notices and Medicare premium changes are time-sensitive.
Questions people commonly ask
- Do I have to claim Social Security to get Medicare?
- How are Medicare premiums paid?
- How do I file for Medicare-only without taking Social Security?
Continue learning
— suggested by the knowledge graph- What is Medicare? A complete overview for retired militaryA plain-English, handbook-grounded overview of the federal health insurance program for people 65 and older, written specifically for retired service members and their families.
- Understanding Original Medicare (Parts A & B) for veteransExactly what Part A and Part B cover, what they cost in 2026, and why both are required to keep TRICARE For Life.
- Enrolling in Medicare: timing, methods, and the military-specific rulesWhen and how to sign up for Medicare Parts A and B — and the timing that protects your TRICARE For Life activation.
- Avoiding the Medicare late-enrollment penaltyThe Part B late penalty is permanent — and TRICARE does not waive it. Here's how to make sure you never owe it.
- Late Enrollment Penalty (Part B and Part D)A permanent monthly surcharge added to your Part B (10% per 12 months delayed) or Part D (1% per month delayed) premium for as long as you have Medicare.
- Premium-Free Part AMost people pay no monthly premium for Medicare Part A because they (or a spouse) paid Medicare taxes for at least 40 quarters (10 years) of work.
- Benefit Period (Part A)The Part A timeframe used to measure hospital deductibles and coinsurance — it resets after 60 days out of the hospital.
- Creditable CoverageNon-Medicare coverage that CMS deems at least as good as a standard Medicare Part D plan — TRICARE Pharmacy qualifies, so TFL beneficiaries don't need Part D.
- Creditable Drug CoveragePrescription drug coverage that CMS certifies is at least as good as standard Medicare Part D — including TRICARE Pharmacy and VA Pharmacy.
- Disability Medicare Eligibility (Under 65)Medicare eligibility before age 65 — automatic after 24 months of SSDI, immediately for ALS, and based on dialysis/transplant for ESRD.
- How do I actually enroll in Medicare?Apply online at SSA.gov/medicare/sign-up, by calling SSA at 1-800-772-1213, or in person at a local SSA office. Online is fastest — most applications process in 1–2 weeks.
- How long does Medicare enrollment take to process?Most online applications are approved in 1–3 weeks. SSA mails the Medicare card within about 30 days of approval.
- What happens to Medicare if I move to another state?Original Medicare and TFL work in any state — no action needed. If you're on a Medicare Advantage plan, moving triggers a Special Enrollment Period to switch plans.
- I'm turning 65. What should I do first?About 3 months before your 65th birthday, sign up for Medicare Parts A and B at SSA.gov. TRICARE For Life activates automatically once both are effective and DEERS is current.
- Do I get a new TRICARE For Life card?No. There's no separate TFL card. Your uniformed services ID card and your red-white-and-blue Medicare card are your proof of coverage.
Related glossary terms
Related Official Resources
Continue learning straight from the source. Every link below goes to an official government or DoD resource.
Last reviewed January 2026 against the 2026 Medicare & You and TRICARE For Life handbooks.