Understanding Your Parent's Insurance: A No-Jargon Guide

Published April 23, 2026 · 5 min read

Your dad just got a bill for $1,800 from a hospital visit you thought was covered. Your mom says she has "Medicare and the supplement" but can't tell you which supplement or what it covers. Someone at the doctor's office asked you about Part D and you nodded like you knew what that meant. You didn't.

Health insurance for aging parents is deliberately confusing. The system wasn't designed for clarity — it was designed by lawyers and actuaries. But as the person coordinating your parent's care, you need to understand it well enough to avoid surprises. Here's the version that skips the jargon.

Original Medicare: Parts A and B

If your parent is 65 or older, they're almost certainly on Medicare. "Original Medicare" means Part A and Part B — the government-run program. No insurance company involved.

Part A is hospital insurance. It covers inpatient hospital stays (after a deductible of about $1,632 per benefit period in 2026), skilled nursing facility stays (up to 100 days, but only after a qualifying hospital stay of at least 3 days), hospice care, and some home health care. Most people don't pay a monthly premium for Part A.

Part B is medical insurance. It covers doctor visits, outpatient procedures, lab tests, preventive screenings, durable medical equipment (walkers, wheelchairs), and some home health services. Part B has a monthly premium (about $175/month in 2026), an annual deductible (about $240), and then covers 80% of approved charges. Your parent pays the other 20%.

That 20% is the problem. Original Medicare has no out-of-pocket maximum. If your parent has a $100,000 surgery and Medicare covers 80%, they owe $20,000. There's no cap. That's why most people need something else on top of Original Medicare.

Medigap (Medicare Supplement) Plans

Medigap plans are private insurance policies that fill in the gaps Original Medicare leaves — hence the name. They cover some or all of the deductibles, copays, and coinsurance that Part A and Part B don't.

There are 10 standardized Medigap plans, labeled with letters (A, B, C, D, F, G, K, L, M, N). The coverage is identical regardless of which insurance company sells it — Plan G from Blue Cross covers the same things as Plan G from Aetna. The only difference is the price and the company's customer service. Our guide on Medicare vs. Medicaid covers this in detail.

Plan G is the most popular for people who enrolled after 2020. It covers the Part A deductible, Part B coinsurance (that 20%), and excess charges. The only thing it doesn't cover is the Part B annual deductible ($240/year). Monthly premiums range from $100-300 depending on your state and your parent's age.

If your parent has a Medigap plan, they can see any doctor or hospital that accepts Medicare — no network restrictions, no referral requirements. This is a significant advantage over Medicare Advantage plans.

Medicare Advantage (Part C)

Medicare Advantage is an alternative to Original Medicare. Instead of Parts A and B plus a Medigap plan, your parent gets everything bundled through a private insurance company — usually an HMO or PPO.

The appeal: Low or zero monthly premiums. Often includes extras like dental, vision, hearing, and fitness programs. Some plans include Part D (prescription drugs) built in.

The trade-off: Networks. Your parent has to use doctors and hospitals within the plan's network (for HMOs) or pay more for out-of-network care (for PPOs). Prior authorization requirements — meaning the insurance company has to approve certain procedures before they happen. And out-of-pocket maximums that can be $7,000-8,000/year, which is better than Original Medicare's unlimited exposure but still significant.

Medicare Advantage plans work well for healthy older adults who live in areas with good network coverage. They work less well for people with complex medical needs, multiple specialists, or who travel between states frequently. Our guide on in-home care costs covers this in detail.

Part D: Prescription Drugs

Original Medicare doesn't cover outpatient prescription drugs. Part D is a separate insurance plan — sold by private companies — that covers medications.

Every Part D plan has a formulary — a list of drugs it covers and how much you pay for each. Drugs are placed in "tiers": generic (cheapest), preferred brand (moderate), non-preferred brand (expensive), and specialty (very expensive). Before choosing a Part D plan, check that it covers your parent's specific medications at a reasonable cost. Medicare.gov has a plan finder tool that lets you enter medications and compare plans side by side.

The Part D coverage gap (sometimes still called the "donut hole") has been largely closed but you'll still pay 25% of brand-name drug costs once your parent hits the gap threshold — about $5,030 in total drug spending in 2026. After catastrophic coverage kicks in, the cost drops significantly.

What to Do Right Now

Find out exactly what your parent has. Sit with them and look at their cards, their bills, and their statements. You need to know: Do they have Original Medicare plus a Medigap plan, or Medicare Advantage? What's their Part D plan? What's their monthly premium total? What are their copays?

If you don't know the answers and they can't tell you, call the number on the back of their Medicare card (1-800-MEDICARE) and the number on their supplemental insurance card. Ask for a summary of benefits.

Mark the annual enrollment period on your calendar: October 15 through December 7. This is when you can change Part D plans or switch between Original Medicare and Medicare Advantage. Plans change their formularies and premiums every year. A plan that was great last year might not cover a medication your parent started taking this year.

Insurance is tedious. Understanding it is also one of the most directly financially valuable things you can do for your parent's care. A missed enrollment deadline, the wrong Part D plan, or an out-of-network charge you didn't see coming — these are $2,000-$10,000 mistakes. Thirty minutes of homework prevents them. For a side-by-side look at tools that help families coordinate, check our caregiving app comparison guide.