Medicare Part B: Doctor Visits and Outpatient Care

Medicare Part B is the physician insurance component of Medicare, covering doctor visits, lab work, imaging, outpatient procedures, preventive services, and durable medical equipment. Unlike Part A, which most retirees receive premium-free, Part B requires active enrollment and a monthly premium. Also unlike Part A, Part B's cost-sharing structure—annual deductible plus 20% coinsurance—means you'll pay out of pocket for every service, even routine preventive care if you don't have supplemental coverage. Many retirees underestimate Part B costs because they focus on the premium and forget about deductibles and copays. Understanding what Part B covers, what it doesn't, and how to pair it with supplemental insurance is essential to budgeting realistic healthcare costs in retirement.

Quick definition: Medicare Part B covers physician visits, outpatient procedures, lab work, imaging, preventive services, and durable medical equipment. It requires a monthly premium and cost-sharing through an annual deductible and 20% coinsurance.

Key takeaways

• Part B requires a monthly premium and active enrollment — Premiums range from ~$165–$560/month (mid-2020s) depending on income; higher income triggers IRMAA surcharges
• You pay an annual deductible and 20% coinsurance — Even preventive services sometimes require copays; don't assume everything is free
• Missing enrollment deadlines results in lifetime penalties — 10% premium increase for each year of delay; there are limited windows to enroll
• Income affects your premium significantly — IRMAA surcharges can double or triple your Part B premium if you have high income
• Part B doesn't cover dental, vision, hearing, or foot care — These are significant gaps; budget separately or seek supplemental coverage
• Preventive services are mostly free if you use in-network providers — Annual wellness visit, cancer screenings, cardiovascular checks typically have no copay

Who Must Enroll in Part B and When

Part B is not automatic. Unlike Part A, which most people get automatically at 65, Part B requires active enrollment. However, if you're already receiving Social Security retirement benefits, you're automatically enrolled in Part B when you turn 65, and you receive a Medicare card by mail. If you're not receiving Social Security, you must manually enroll through Medicare.gov, by phone, or at a Social Security office.

Enrollment windows:

• Initial Enrollment Period (IEP): Seven months centered on your 65th birthday (three months before, the month of, three months after). This is your main chance to enroll without penalty.
• General Enrollment Period (GEP): January 1–March 31 each year, but you face a 10% monthly premium penalty if you missed your IEP and don't have qualifying coverage.
• Qualifying life events: Marriage, loss of employer coverage, relocation—these can trigger a special enrollment period allowing you to enroll without penalty.

The penalty: If you delay Part B enrollment beyond your IEP without qualifying coverage (such as employer group health insurance), you pay a 10% premium surcharge for each 12-month period you were eligible but not enrolled. This penalty is permanent. So if you delay three years, you pay 30% more in premiums for life. This penalty has caught thousands of retirees by surprise.

Part B Premiums: The Monthly Cost

Standard Part B premium (mid-2020s): About $165/month for most beneficiaries. This is adjusted annually for inflation and changes in program costs.

Income-Related Monthly Adjustment Amounts (IRMAA): If your Modified Adjusted Gross Income (MAGI) exceeds certain thresholds (calculated using tax return data from two years prior), you pay higher premiums:

• Individual income <$97,000: Standard premium (~$165)
• $97,000–$123,000: +$70 (total ~$235)
• $123,000–$153,000: +$175 (total ~$340)
• $153,000–$183,000: +$280 (total ~$445)
• >$183,000: +$560 (total ~$725)

Married filing jointly thresholds are roughly double the individual thresholds. A couple with $280,000 in household income might face maximum IRMAA surcharges.

Why IRMAA matters: A retiree with $250,000 in annual income pays nearly 4.5× the standard Part B premium compared to a retiree with $70,000 in income. Over 20 years of retirement, this difference totals hundreds of thousands of dollars. This is why strategic income management—delaying Social Security, controlling withdrawals, timing Roth conversions—matters for high-income retirees.

Part B Cost-Sharing: Deductible and Coinsurance

In addition to premiums, Part B has an annual deductible and coinsurance you pay each time you use a service.

Annual deductible: About $240 in 2024. Once you hit this annually, your deductible resets the following January 1. You pay this once per calendar year regardless of how many services you use.

Coinsurance: After meeting your deductible, you typically pay 20% coinsurance (Medicare pays 80%) for most Part B services. So a doctor visit costing $100 results in you paying $20. A $5,000 surgery results in you paying $1,000.

Examples:

• Doctor visit ($150 total cost): You pay the deductible ($240) for your first visit of the year; the visit cost ($150) is less than the deductible, so you pay $150 and insurance applies the $150 to your deductible. On your second visit of the year (after deductible is met), you pay 20% coinsurance.
• Lab work ($80 total cost): After deductible is met, you pay 20% = $16.
• Imaging like MRI ($1,200 total cost): After deductible is met, you pay 20% = $240.

Out-of-network providers: If you see a provider who doesn't accept Medicare assignment, you may pay higher costs. Providers can "opt out" of Medicare and charge their own rates. Ask your doctor whether they accept Medicare assignment before scheduling.

What Medicare Part B Covers

Physician Services

In-office visits: Primary care, specialist consultations, follow-ups. After your deductible, you pay 20% coinsurance.

Specialist care: Cardiology, neurology, orthopedics, oncology—any specialty. Same cost structure as primary care.

Telehealth visits: During and after the COVID-19 pandemic, Medicare expanded telehealth coverage. Most doctor-to-patient video visits are now covered at the same rate as in-person visits.

Mental health and substance-abuse counseling: Therapy, psychiatry, substance-abuse treatment are covered under Part B at the standard 20% coinsurance.

Diagnostic Services and Lab Work

Lab work: Blood tests, urinalysis, etc. Typically covered at 100% (no deductible or coinsurance) if ordered by a physician.

Imaging: X-rays, CT scans, MRI, ultrasound, PET scans. After deductible, you pay 20% coinsurance.

Electrocardiograms and other diagnostic tests: Covered similarly to lab work and imaging.

Preventive Services (Often Free)

Medicare Part B covers many preventive services at no cost (zero copay, no coinsurance) if you use an in-network provider:

• Annual wellness visit: A comprehensive preventive visit with your doctor once per year
• Cancer screenings: Mammography (breast cancer), colonoscopy (colorectal cancer), Pap test (cervical cancer), PSA test (prostate cancer)
• Cardiovascular screening: Blood pressure check, lipid panel, carotid ultrasound
• Diabetes screening: Glucose testing
• Bone density screening: DEXA scan for osteoporosis
• Pneumococcal vaccine: Pneumonia prevention
• Flu and COVID-19 vaccines: Covered at no cost
• AAA screening: Abdominal aortic aneurysm ultrasound for certain ages
• Cognitive assessment: Screening for dementia during annual wellness visit

Important caveat: These are free if they're considered "preventive." If the same service is done for a different reason (e.g., imaging is "diagnostic" rather than preventive), the standard 20% coinsurance may apply. The distinction can be subtle and sometimes disputed.

Durable Medical Equipment

Items like wheelchairs, walkers, oxygen equipment, diabetic supplies, blood-pressure cuffs, and hospital beds are typically covered at 80% (you pay 20% coinsurance) after deductible. You must rent or purchase from a Medicare-approved supplier.

Mental Health Services

Therapy, psychiatric consultations, and group counseling are covered at the standard 20% coinsurance. Parity rules ensure mental health services are covered at the same rate as physical health services.

What Part B Does NOT Cover

This is where many retirees get surprised:

Dental care: Cleanings, fillings, extractions, root canals, crowns, dentures—none are covered by Part B. A single crown can cost $1,500. Dentures cost $2,000–$5,000. Budget separately for dental or seek a Medicare Advantage plan with dental benefits.

Vision care: Eye exams, glasses, contacts, and replacement lenses are not covered. An eye exam costs $100–$200; progressive glasses cost $300–$800; hearing aids are not covered either (though some Medicare Advantage plans offer hearing benefits). Plan for these separately.

Hearing aids: Hearing tests (except as part of annual wellness) are not covered, and hearing aids themselves are not covered. A pair of hearing aids costs $2,000–$6,000. Some Medicare Advantage plans offer limited hearing benefits.

Routine foot care: Calluses, corns, nail trimming, and other routine foot care are not covered unless you have diabetes (diabetic foot care is covered). Podiatry can be expensive; budget for it.

Cosmetic procedures: Facelifts, liposuction, and other elective cosmetic procedures are not covered.

Chiropractic care: Not covered (though some Medicare Advantage plans offer limited chiropractic benefits).

Cost-Sharing Breakdown

Real-World Examples

Example 1: Preventive Visit, No Extra Costs — Grace, 68, has her annual wellness visit with her primary care doctor. The visit includes blood pressure check, lipid panel, and cognitive screening. Since it's a covered preventive service, Grace pays $0. No copay, no deductible, no coinsurance. This is one of the rare "free" Part B services.

Example 2: Doctor Visit Plus Lab Work — Marcus, 70, develops a cough and visits his primary care doctor. The visit costs $150 (after deductible is applied). Three days later, he needs a chest X-ray ($400) and lab work ($80). For the year:

• Deductible: $240
• Doctor visit: $150 (applied to deductible)
• Remaining deductible: $90
• Chest X-ray: $400; he owes $90 (rest of deductible) + 20% of $310 = $90 + $62 = $152
• Lab work: $80; deductible met, he owes 20% = $16
• Total out of pocket: ~$208 (assuming lab is partially covered at 100%)

Example 3: Multiple Specialist Visits — Patricia, 72, has arthritis and high blood pressure. She visits her rheumatologist ($200 visit), her cardiologist ($150 visit), and has lab work ($120) and an MRI ($1,200). After deductible is met:

• Rheumatologist: 20% of $200 = $40
• Cardiologist: 20% of $150 = $30
• Lab work: Sometimes 100% covered, sometimes 20%; assume $0–$24
• MRI: 20% of $1,200 = $240
• Total annual out of pocket (if deductible already met): ~$310

If deductible hasn't been met, add $240. This is why many retirees pair Part B with Medigap insurance to cap out-of-pocket costs.

Example 4: Dental and Vision Gaps — James, 75, needs a crown (Part B doesn't cover dental) costing $1,500, new glasses ($400), and a hearing aid ($3,500). Part B covers none of these. Total out of pocket: $5,400. This scenario—where Part B's gaps create significant costs—is common and often unexpected.

Common Mistakes

Not enrolling on time and paying forever. The most common Part B mistake is missing the Initial Enrollment Period. Late-enrollment penalties are permanent. If you miss your IEP, get help immediately; some life events allow penalty-free late enrollment, but don't delay confirming your options.

Thinking preventive services are totally free. While annual wellness visits and screenings like colonoscopy are covered at no cost, be aware that if the same service is done for a diagnostic reason (e.g., "we found a polyp during your screening and removed it"), that portion may trigger copays. Always ask before a procedure whether it's preventive or diagnostic.

Ignoring Part B's gaps: dental, vision, hearing. Retirees often don't budget for dental and vision because they forget Part B doesn't cover them. A crown, dentures, hearing aids, or glasses can add $2,000–$5,000 annually. Budget for these separately or seek a Medicare Advantage plan with these benefits.

Not understanding IRMAA. Retirees with high income often don't realize their Part B premium will spike based on income from two years prior. A large IRA withdrawal or capital gain in 2024 triggers IRMAA surcharges in 2026. Plan withdrawals strategically.

Paying full price by seeing out-of-network providers. Some doctors don't accept Medicare assignment. If you see them, you may pay significantly more. Always verify your doctor accepts Medicare before scheduling.

FAQ

Do I have to pay the Part B premium if I don't use much healthcare? Yes, you must pay the premium whether you use Part B or not. Premiums are mandatory if you're enrolled. Some people choose to delay Part B if they have employer coverage, but once employer coverage ends, you should enroll to avoid penalties.

Why does Part B have 20% coinsurance when Part A has copays? This is a historical artifact of how Medicare was designed. Part A uses copays (fixed dollar amounts) for hospital stays; Part B uses coinsurance (percentage of cost) for outpatient services. The structure reflects different cost patterns: hospital stays have predictable costs, while outpatient costs vary widely.

Can I reduce my IRMAA? Yes, if your income dropped due to retirement, widowhood, loss of employment, or business income decline, you can request an "individual circumstances" adjustment to lower your IRMAA. Submit a form SSA-44 or appeal to Medicare. High-income retirees sometimes strategically delay Social Security or manage Roth conversions to stay below IRMAA thresholds.

What if I can't afford Part B premiums? If your income is very low, you may qualify for Medicaid (which covers Part B premiums) or other assistance programs. Contact your state Medicaid office or Medicare at 1-800-MEDICARE for information.

Does Part B cover acupuncture or chiropractors? Acupuncture is covered for chronic lower back pain under specific conditions. Chiropractic care is not covered. Some Medicare Advantage plans offer chiropractic benefits.

Related concepts

• Medicare Basics
• Medicare Part A
• Medicare Part D Drug Coverage
• Medicare Advantage vs. Medigap
• The Cost of Healthcare in Retirement

Summary

Medicare Part B covers physician visits, outpatient procedures, preventive services, lab work, and durable medical equipment. It requires active enrollment during your Initial Enrollment Period (centered on your 65th birthday), a monthly premium (~$165 for standard beneficiaries, higher if you have income >$97,000), and cost-sharing through a $240 annual deductible plus 20% coinsurance. Preventive services like annual wellness visits and cancer screenings are covered at no cost. Part B does not cover dental, vision, hearing, or routine foot care—significant gaps. Income-Related Monthly Adjustment Amounts (IRMAA) can double or triple your premium if your income is high. Missing enrollment deadlines results in permanent 10% monthly penalties. Understanding Part B's coverage, gaps, and interaction with supplemental insurance is essential to realistic retirement healthcare budgeting. Confirm current rules with Medicare.gov or a qualified professional.

Next

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