Common mistakes retired military make at 65 — and how to avoid them

Most of the mistakes retired veterans make at 65 are preventable. They're not signs of inattention — they're the predictable result of a confusing transition with high financial stakes. This lesson catalogs the most common errors and the simple fix for each.

Mistake 1: Declining Medicare Part B to "save money"

What happens: You decline Part B at 65 because the premium feels expensive. TRICARE Prime/Select ends. TFL never activates. You now have no health coverage except VA (if enrolled). Later you realize the mistake and try to enroll in Part B during a General Enrollment Period — you pay a permanent late-enrollment penalty and have a coverage gap.

The fix: Enroll in Part B during your IEP. The premium is your only meaningful out-of-pocket cost for one of the most generous coverage combinations in U.S. healthcare.

Mistake 2: Enrolling in Medicare Part D

What happens: A neighbor or a TV commercial convinces you that you need Part D for prescription drugs. You enroll. Your Express Scripts coverage starts having coordination problems with the Part D plan, and you pay duplicate premiums for coverage you already had.

The fix: Do not enroll in Part D. TRICARE Pharmacy is your drug coverage and is officially "creditable." No Part D penalty applies to TFL beneficiaries who skip Part D.

Mistake 3: Counting on the MTF

What happens: You assume the MTF doctor you've used for years will continue seeing you after 65. A few months in, you can't get appointments. By the time you start looking for a civilian doctor, the best local practices are full.

The fix: Find a Medicare-participating civilian primary care doctor BEFORE your 65th birthday. Build the relationship while you still have MTF access as a backup.

Mistake 4: Missing the Initial Enrollment Period

What happens: You think you have until you stop working, or until next year, or until something. The 7-month IEP window closes. You enroll in the next GEP and pay a permanent penalty.

The fix: Mark your IEP on the calendar the moment you turn 64. Enroll in month 1 of the IEP (3 months before your 65th-birthday month) to guarantee Part B is active when TRICARE ends.

Mistake 5: Choosing a Medicare Advantage plan without checking the network

What happens: A brochure or sales call describes a great-sounding MA plan with a Part B giveback and dental coverage. You enroll. Then you discover your cardiologist isn't in the network, and your specialist hospital is out of network too.

The fix: Before enrolling in any MA plan, call each of your current doctors and verify network status directly with their billing office. Confirm formulary, prior-authorization rules, and how the plan coordinates with TFL.

Mistake 6: Letting DEERS go stale

What happens: You move, marry, divorce, or have a family change. You forget to update DEERS. Months later your TFL claim is denied because DEERS shows you as ineligible.

The fix: Check DEERS at milconnect.dmdc.osd.mil at least annually and every time your address or family status changes.

Smaller but still expensive mistakes

• Forgetting to bring both cards to appointments — leads to claims being filed incorrectly.
• Assuming dental and vision are covered — they aren't; budget separately.
• Filing claims yourself when the crossover would have handled it — wastes time.
• Dropping Part B in retirement to "rely on VA" — ends TFL permanently.
• Spouses assuming they're enrolled — each spouse enrolls independently at their own 65.

The one-page checklist

1. Calendar your IEP dates by your 64th birthday.
2. Confirm DEERS is current.
3. Enroll in Part A and Part B in month 1 of your IEP.
4. Find a Medicare-participating civilian PCP before your 65th birthday.
5. Bring both cards to every appointment.
6. Do NOT enroll in Part D.
7. Use Express Scripts or MTF pharmacy.
8. Evaluate FEDVIP or MA dental/vision/hearing options separately.
9. Keep VA, Medicare, and TFL all active.
10. Re-check the plan landscape each Annual Election Period.

The bottom line: Most of these mistakes share one root cause — treating Medicare enrollment as optional or postponable. Treat your IEP as a hard deadline, enroll in Part B on time, and 90% of the transition errors disappear.

Continue learning

— suggested by the knowledge graph

Lessons

• What is TRICARE For Life? The complete guide for retired militaryThe Medicare-wraparound benefit you earned through service — what it covers, who qualifies, what it costs, and how it activates.
• 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.

Encyclopedia

• Medicare Part AThe hospital insurance side of Original Medicare — covers inpatient stays, skilled nursing, hospice, and some home health.
• Medicare Part BThe medical insurance side of Original Medicare — covers doctor visits, outpatient care, preventive services, and durable medical equipment.
• Medicare Part C (Medicare Advantage)An optional, all-in-one alternative way to get your Medicare benefits — delivered through a private plan instead of through Original Medicare.
• Medicare Part DMedicare's optional prescription drug coverage — almost always unnecessary if you have TRICARE For Life.
• TRICARE For Life (TFL)The wraparound secondary health coverage for Medicare-eligible military retirees, spouses, and survivors — no premium, no enrollment fee.
• DEERSThe DoD's master database that determines who is eligible for TRICARE — including TRICARE For Life.
• milConnectThe DoD self-service web portal where retirees verify and update DEERS, view TRICARE coverage, and request ID cards.
• Initial Enrollment Period (IEP)The 7-month window around your 65th birthday when you first sign up for Medicare Parts A and B without penalty.
• General Enrollment Period (GEP)The January 1 – March 31 window each year when you can sign up for Medicare if you missed your IEP and don't qualify for an SEP.
• 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.

FAQs

• What are the biggest mistakes retired military make at 65?Declining Part B, missing the IEP, ignoring DEERS, enrolling in Part D unnecessarily, and assuming MTF access continues. Each can cost thousands or end TFL.
• Can I drop Part B later to save money?Technically yes, but the day Part B ends, TFL ends. Re-enrolling requires waiting for the next General Enrollment Period and triggers a permanent late penalty.
• I have VA healthcare. Can I just skip Medicare entirely?Risky. VA doesn't count as creditable coverage for Part B, and skipping Part B ends TFL and triggers a permanent late penalty if you ever enroll later.
• What's the cost of ignoring DEERS updates?WPS rejects claims if DEERS doesn't match your Medicare status. You'll get surprise bills for services TFL would have covered — until DEERS is fixed.
• I accidentally enrolled in a Part D plan. What now?Disenroll during AEP (Oct 15 – Dec 7) for the next year, or use an SEP if you qualify. TRICARE Pharmacy still works — but stop paying the duplicate Part D premium.
• Should I trust the Medicare mailers I keep getting?Be skeptical. Many are insurance carrier ads dressed up as official notices. Real Medicare communication comes from CMS, SSA, or your existing plan.