Compare Medicare Part B and Senior Health Insurance

Understanding Your Coverage Landscape After 65

Turning 65 triggers a cascade of mailers, phone calls, and online ads all promising the "best" health coverage. The noise makes it hard to see the actual choices. At the center of every decision sits Medicare Part B—the outpatient medical insurance that covers doctor visits, preventive services, durable medical equipment, and outpatient procedures. You cannot buy a private senior health plan that replaces Part B; every alternative either wraps around it or requires you to keep it. Understanding that relationship is the first step toward a choice that protects both your health and your wallet.

What Medicare Part B Actually Pays For

Part B is not optional if you want comprehensive coverage. In 2024, the standard monthly premium is $174.70, though higher earners pay more under Income-Related Monthly Adjustment Amounts (IRMAA). After you meet the $240 annual deductible, Part B generally pays 80% of the Medicare-approved amount for covered services. You owe the remaining 20% coinsurance with no out-of-pocket maximum. That unlimited exposure is the primary reason most beneficiaries add supplemental coverage.

• Doctor visits and specialist consultations (no referral required)
• Preventive care including annual wellness visits, screenings, and vaccines
• Outpatient surgery and emergency department visits that don't result in inpatient admission
• Durable medical equipment such as walkers, oxygen, and blood sugar monitors
• Mental health services and limited occupational/physical therapy

Part B does not cover routine dental, vision, hearing aids, or long-term custodial care. It also excludes most prescription drugs you pick up at a pharmacy—those fall under Part D.

The Three Main Alternatives That Work With Part B

Because Part B leaves gaps, seniors typically choose one of three paths. Each handles the 20% coinsurance and the missing drug, dental, and vision benefits differently.

1. Original Medicare + Medigap (Supplemental) + Part D

This is the "build-your-own" approach. You keep Part A and Part B, buy a standardized Medigap policy (Plans A through N) from a private insurer, and add a standalone Part D drug plan. Medigap Plan G and Plan N are the most popular for new enrollees. Plan G covers the Part B deductible and all 20% coinsurance; Plan N covers the coinsurance but asks for up to $20 copays for office visits and $50 for ER visits.

Advantages: Nationwide access to any provider accepting Medicare (over 95% of physicians), no network restrictions, predictable costs after premiums, and guaranteed renewability regardless of health changes. Drawbacks: Higher combined monthly premiums (often $250–$400+ for Medigap + Part D + Part B), separate cards and claims systems, and medical underwriting if you apply outside your six-month Medigap Open Enrollment period or a guaranteed-issue right.

2. Medicare Advantage (Part C)

Medicare Advantage plans are private "all-in-one" bundles that replace Original Medicare. You still pay the Part B premium, but the plan receives a fixed monthly payment from Medicare to manage your care. Most include Part D drugs, dental, vision, hearing, and fitness benefits. Plans operate as HMOs, PPOs, or less common PFFS/SNP models.

Advantages: Low or $0 additional premium beyond Part B, annual out-of-pocket maximums (capped at $8,850 in-network for 2024), extra benefits bundled on one card, and often lower cost-sharing for primary care. Drawbacks: Network restrictions (HMOs require referrals and in-network providers), prior authorization hurdles for specialists and high-cost services, plan benefits and networks can change each calendar year, and you may lose access to specific academic medical centers.

3. Employer or Retiree Coverage

If you or your spouse still works for an employer with 20+ employees, that group plan pays first and Medicare pays second. You can delay Part B enrollment without penalty. Retiree plans from former employers or unions often act as wraparound coverage, sometimes more generous than Medigap. However, these plans are disappearing; only about 25% of large firms now offer retiree health benefits.

Critical rule: If you have creditable employer coverage, you get a Special Enrollment Period to sign up for Part B later without penalty. Once that coverage ends, you have eight months to enroll in Part B and 63 days to pick a Part D plan or Medigap policy with guaranteed issue rights.

Side-by-Side Cost Comparison for a Typical 70-Year-Old

Numbers vary by zip code, but a Midwest metropolitan example illustrates the trade-offs.

• Original Medicare + Plan G + Part D: Part B $174.70 + Plan G $185 + Part D $35 = $394.70/month before any care. After that, near-zero cost-sharing for Medicare-covered services.
• Medicare Advantage HMO (popular $0 premium plan): Part B $174.70 + $0 plan premium = $174.70/month. Typical copays: $0 PCP, $35 specialist, $295/day hospital days 1–6, 20% for chemo/dialysis up to $8,850 MOOP.
• Employer retiree plan (supplemental): Part B $174.70 + retiree premium $120 = $294.70/month. Often covers Part B deductible and coinsurance plus dental/vision.

The Advantage plan looks cheapest monthly, but a single hospitalization or cancer treatment can push you to the $8,850 maximum. The Medigap route front-loads cost into premiums for near-total predictability. The retiree plan splits the difference but depends on the former employer's solvency and willingness to keep the benefit.

How to Choose: A Decision Framework

Match your priorities to the structure that fits.

Choose Original Medicare + Medigap if:

• You want unrestricted access to specialists and major medical centers (Mayo, Cleveland Clinic, MD Anderson) without referrals.
• You travel frequently or split time between states; Medigap follows you anywhere Medicare is accepted.
• You have a chronic condition likely to generate high ongoing bills (e.g., rheumatoid arthritis requiring infused biologics, dialysis, frequent imaging).
• You can afford higher fixed premiums to avoid surprise bills.
• You are within your Medigap Open Enrollment window (first six months of Part B at 65+) or have a guaranteed-issue right.

Choose Medicare Advantage if:

• Your preferred doctors and hospitals are in the plan's network and you're comfortable staying there.
• You want dental, vision, hearing, and gym benefits bundled without separate policies.
• You prefer low monthly premiums and can handle variable copays/coinsurance.
• You are healthy enough that hitting the out-of-pocket maximum is unlikely, or you have savings to cover it.
• You live in an urban/suburban area with robust plan competition (rural counties often have fewer or no Advantage options).

Stick with Employer/Retiree Coverage if:

• The plan is creditable (covers at least as much as Medicare) and affordable.
• You or your spouse are still working and the employer has 20+ employees.
• The retiree plan includes generous drug coverage and low cost-sharing.
• You understand the plan's coordination-of-benefits rules and enrollment deadlines.

Four Practical Steps Before You Decide

1. List your providers. Call each doctor's billing office and ask: "Do you accept Original Medicare? Are you in-network for [specific Advantage plan]?"
2. Run your drugs through the Medicare Plan Finder. Enter every medication, dosage, and pharmacy. The tool shows total annual cost (premiums + copays) for each Part D and Advantage plan in your zip code.
3. Check the Medigap pricing method. Ask insurers whether they use community-rated (same premium for all ages), issue-age-rated (premium based on age at purchase), or attained-age-rated (premium rises as you age). Attained-age policies start cheaper but become the most expensive over time.
4. Verify the timeline. If you're turning 65, your Initial Enrollment Period runs three months before through three months after your birth month. Missing it can mean lifetime Part B penalties and medical underwriting for Medigap.

Final Thought: Revisit Annually

The "right" choice at 65 may not fit at 75. Health status changes, provider networks shift, drug formularies evolve, and premiums rise. Medicare's Annual Election Period (October 15–December 7) lets you switch Advantage plans, move between Advantage and Original Medicare, or change Part D plans. Medigap changes are possible anytime but usually require underwriting. Set a calendar reminder each September to review your coverage against your current health needs and budget. The best plan is the one that lets you get the care you need without financial dread—and that calculation deserves a fresh look every year.