Medicare Supplement Plans by State: How to Compare Medigap Options in Georgia, Pennsylvania, and California

When your parent is approaching Medicare eligibility, one of the most confusing realizations is that "Medicare supplement plans" are not priced the same everywhere. The plan letters -- G, N, F -- are federally standardized, meaning a Plan G in Georgia covers exactly the same services as a Plan G in California. What is not standardized is the price. Premiums for identical coverage can differ by hundreds of dollars per year depending on your parent's state, county, and even the insurance carrier they choose.

This guide explains how Medigap plan shopping works in four states where families frequently search: Georgia, Pennsylvania, California, and Indiana. The principles apply broadly regardless of state.

Why Medigap Premiums Differ by State

Before comparing states, it helps to understand what drives the price variation.

Rating method is the biggest factor. Insurance companies use one of three systems to set premiums:

• Attained-age rated: The premium starts low but rises every year as your parent gets older. A Plan G at $140/month at age 65 might be $220/month at age 75. These plans are common in most states and almost always the cheapest at enrollment -- but the most expensive long-term.
• Issue-age rated: The premium is locked at whatever age your parent enrolls. It rises only with general medical inflation, not because your parent is aging. Better long-term value.
• Community rated: Everyone in the carrier's pool pays the same rate regardless of age. Found mostly in New York, Connecticut, Massachusetts, and Maine. Expensive upfront but stable.

State insurance regulations also matter. Some states restrict which carriers can operate, require additional consumer protections, or limit premium increases. This affects both price and plan availability.

The carrier itself matters even within the same state. Because Plan G benefits are identical across carriers, the only real differences are price, rate increase history, and customer service. A carrier with a history of aggressive annual rate increases can make a plan that looks cheap today very expensive in five years.

Medicare Supplement Plans in Georgia

Georgia uses attained-age rating almost universally, which means your parent will generally see low premiums at 65 that increase over time. This makes it especially important to compare carriers not just on current price but on their track record for annual increases.

What to expect in Georgia:

Plan G is the dominant choice for new enrollees (those turning 65 after January 1, 2020, since Plan F is no longer available to them). Premiums for Plan G in Georgia for a 65-year-old female non-smoker typically range from around $115 to $175 per month depending on the carrier and region within the state. Atlanta metro areas tend to run higher than rural counties.

Plan N is also available and costs $30 to $50 less per month than Plan G, with the trade-off of small copays (up to $20 for office visits, up to $50 for ER visits that don't result in admission) and no coverage for Part B excess charges.

Georgia does not have a birthday rule, so once your parent's initial six-month Medigap Open Enrollment Period closes, switching plans requires medical underwriting. If your parent develops a chronic condition, they may not be able to switch carriers to get a better rate. This makes the initial carrier decision particularly consequential in Georgia -- prioritize a carrier with a stable rate history, not just the lowest entry price.

Comparing Part D in Georgia: Georgia has access to the same nationally available Part D plans as the rest of the country. Use the Medicare Plan Finder at Medicare.gov/plan-compare to enter your parent's exact medication list. Sort by "lowest drug + premium cost," not by premium alone. Prices at your parent's specific pharmacy can vary dramatically between "preferred" and "standard" network pharmacies within the same plan.

Medicare Supplement Plans in Pennsylvania

Pennsylvania is one of the states that bans Part B excess charges, which has an important implication: Plan N offers nearly the same financial protection as Plan G, but at a lower monthly premium.

What excess charge protection means: Doctors who "participate" in Medicare accept Medicare's approved rate as full payment. "Non-participating" providers can legally charge up to 15% more than the Medicare rate. Plan G covers this gap; Plan N does not. But Pennsylvania law prohibits providers from billing that 15% excess to patients. This effectively makes excess charges a non-issue in the state, removing one of the main reasons to choose Plan G over Plan N.

What to expect in Pennsylvania:

Plan G premiums for a 65-year-old in Pennsylvania typically range from $120 to $190 per month depending on carrier and geographic area. Philadelphia and Pittsburgh metro areas run toward the higher end. Plan N premiums run roughly $90 to $145.

Because Plan N and Plan G offer equivalent protection in Pennsylvania (thanks to the excess charge ban), many families in this state find Plan N to be the better value. The monthly savings of $30 to $50 add up to $360 to $600 per year.

Pennsylvania does not have a birthday rule, so the same caution about initial carrier selection applies here. Research the carrier's rate increase history through the Pennsylvania Insurance Department's rate review database before committing.

Medicare Plans in California

California is one of the strongest states for Medigap consumers because of the California Birthday Rule. Starting 30 days before your parent's birthday and ending 60 days after, California law allows Medigap policyholders to switch to a plan with equal or lesser benefits from any carrier -- without medical underwriting. Health questions are not allowed. This annual window gives your parent an opportunity every year to shop for a lower premium without the risk of being denied.

What this means practically: Your parent can initially choose the Plan G carrier with the lowest current premium without worrying as much about long-term rate stability. If that carrier raises premiums aggressively in year three, your parent can switch during the next birthday window to a cheaper carrier offering the same Plan G benefits.

What to expect in California:

Plan G premiums vary significantly across California's counties. Los Angeles County and the Bay Area tend to run higher; inland areas run lower. A 65-year-old in Los Angeles might see Plan G premiums from $150 to $220 per month. In Sacramento or Fresno, the range might be $125 to $180.

California also has significant Medicare Advantage enrollment due to the large number of integrated health systems and HMO infrastructure in the state. However, for parents who want the freedom to see any specialist without referrals or prior authorization, the Original Medicare + Medigap path remains the most flexible.

Part D in California: The same national plan pool applies. In densely populated counties like Los Angeles, your parent may have access to 50 or more Medicare Advantage prescription drug plans and a dozen or more stand-alone Part D plans. Use the Plan Finder tool to compare based on your parent's actual drug list and preferred pharmacy.

Medicare Part D Plans in Indiana

Indiana residents access the same federally standardized Part D drug plans available nationally, but local pharmacy network structures matter.

Indiana does not have a state birthday rule for Medigap, so the same considerations about carrier selection and rate history apply. Plan G is the primary comprehensive option for new enrollees.

For Part D plan selection in Indiana:

The most important variables are the same everywhere -- your parent's specific medications, dosages, and preferred pharmacy. In Indiana, major chains like CVS, Walgreens, Kroger Pharmacy, and Meijer Pharmacy are commonly included in plan networks. Mail-order pharmacy pricing can sometimes significantly reduce costs for maintenance medications your parent takes regularly.

Run the Plan Finder comparison annually during the Annual Open Enrollment Period (October 15 through December 7). Part D plans change their formularies and tier placements every year. A plan that covered your parent's cholesterol medication at a low copay in 2025 may have moved it to a higher tier in 2026, increasing the annual cost by hundreds of dollars.

The Universal Steps for Comparing Plans in Any State

Regardless of which state your parent lives in, the comparison process is the same:

Step 1: Confirm which plan type fits their situation. If your parent sees specialists frequently, travels regularly, or has complex health conditions, Original Medicare + Medigap gives them the most access and the most predictable costs. If they are healthy and primarily use in-network local care, Medicare Advantage may offer savings -- but review the prior authorization requirements carefully.

Step 2: Get quotes from multiple carriers for Plan G and Plan N. Use a comparison service or work with an independent broker who represents multiple carriers (not a captive agent who sells only one carrier's products). Make sure to ask about the carrier's rate increase history for the last five years -- this is public information through state insurance departments.

Step 3: Compare Part D plans using Medicare.gov Plan Finder. Log into your parent's MyMedicare.gov account so the tool can pull their actual prescription history. Enter every medication with the correct dosage and frequency, select your parent's preferred pharmacy, and sort by total estimated annual cost -- not by premium.

Step 4: Note your parent's state-specific protections. If your parent is in California, Idaho, Oregon, Illinois, Nevada, Louisiana, Kentucky, or Maryland, they benefit from birthday rules. If they are in New York, Connecticut, Massachusetts, or Maine, they have year-round guaranteed issue rights. These protections affect how much flexibility they retain after the initial enrollment window.

Step 5: Make the initial plan selection during the Medigap Open Enrollment Period. This is the six-month window that starts when your parent is both 65 and enrolled in Medicare Part B. It is the only time they are guaranteed to be accepted at standard rates with no health questions. Missing this window puts them at the mercy of medical underwriting in most states.

The Bottom Line for Families

Medigap premiums are not fixed. They vary by state, by county, by carrier, and by rating method. The same Plan G benefits can cost your parent $130 or $200 per month depending on who they choose and where they live. In states without birthday rules, the carrier decision made at age 65 may be the one your parent lives with indefinitely -- so spending time on the comparison up front is worth it.

If the process of researching carriers, interpreting rate histories, understanding state protections, and comparing Part D plans alongside Medigap options feels overwhelming, our Medicare Enrollment Guide for Adult Children walks through the entire process step by step, with a state-by-state protection reference and a carrier evaluation checklist designed for families navigating this for the first time.