Medicare Supplement

Before you renew Medigap in Sioux Falls: what shifts in 2027

SIOUX FALLS, S.D. — As 2026 winds down, Medigap shoppers in Sioux Falls are heading into the season when several moving parts line up at once: the standardized plan letters you can buy, the yearly reset of the Part B deductible that Plans G and N are built around, and the rate filings South Dakota insurers submit to the state. None of these are dramatic overnight changes, but together they shape what you pay and what you can switch into in 2027.

Medicare SupplementSioux Falls, SD

Here is a plain-language look at what is actually changing — and what is staying the same — for Medigap in Minnehaha County.

What "changing" really means for Medigap

Unlike Medicare Advantage and Part D — which reshuffle every fall during the October 15–December 7 Annual Enrollment Period — Medigap does not have a yearly open enrollment window for most people. The federal plan letters (A, B, D, G, G-HD, K, L, M, N for people newly eligible today) do not change from year to year. What changes each year are:

• The Part B deductible amount that Plans G and N are designed around.
• The premiums insurers charge, which are filed with the South Dakota Division of Insurance.
• Which insurers are actively selling which plan letters in South Dakota.

If you already own a Medigap policy, it renews on its own schedule. What arrives in the mail near renewal is usually a rate-adjustment notice, not a plan redesign.

Plan-letter eligibility: who can buy what

Federal rules split Medigap shoppers into two groups:

• Newly eligible on or after Jan. 1, 2020: You can buy Plans A, B, D, G, G-HD, K, L, M and N. Plans C and F are not available to you because they cover the Part B deductible, and Congress closed that door for newer enrollees.
• Eligible before Jan. 1, 2020: You may still buy or keep Plans C and F if an insurer offers them.

This rule is not changing for 2027. It is worth restating every year because it is the single biggest source of confusion when a Sioux Falls resident compares notes with a neighbor who joined Medicare earlier.

The yearly Part B deductible reset

Plans G and N — the two most commonly discussed letters for newer enrollees — both leave the Part B deductible for you to pay before the plan starts filling in cost-sharing. That deductible resets every January 1 at an amount set by CMS. When people say a Medigap plan "changed" for the new year, this is usually what they mean: the underlying Part B deductible went up (or held steady), so the first-dollar math on Plan G or N shifts slightly.

For the exact 2027 Part B deductible figure once CMS releases it, check medicare.gov or call 1-800-MEDICARE.

Rate-adjustment season in South Dakota

Medigap premiums are not standardized. Two insurers can sell the same Plan G with identical federal benefits and charge very different premiums, and each can raise rates on its own schedule. In South Dakota, those rate changes are filed with the state Division of Insurance. Before you renew — or before you shop a new policy — you can:

• Ask your current insurer, in writing, for the effective date and amount of any rate change.
• Look up filings through the South Dakota Division of Insurance.
• Use the Medicare.gov Medigap policy search to compare currently available policies in your ZIP code.
• Call the South Dakota SHIINE program (the state's SHIP) for free, unbiased help.

Because Medigap does not have medical-underwriting protection outside of specific windows (such as your six-month Medigap Open Enrollment Period at 65, or certain guaranteed-issue situations), switching carriers after a rate increase may involve health questions. That is worth knowing before you shop.

Insurers in the Sioux Falls market

Sioux Falls sits in Minnehaha County, and Medicare plan availability is set at the county and ZIP level. In ZIP 57103, the Medicare.gov Medigap policy search lists 27 insurers offering standardized plans across letters A, B, C, D, F, F-HD, G, G-HD, K, L and N.

The table below lists every insurer and the plan letters each one sells in South Dakota. A few things to notice as you scan it:

• Some carriers, such as AARP - UnitedHealthcare Insurance Company, Humana (Humana Insurance Company) and United American Insurance Company, offer a wide range of letters including the older Plans C and F for people who remain eligible for them.
• Regional names familiar to South Dakota shoppers — Avera Health Plans, Inc., Wellmark BlueCross BlueShield of South Dakota and South Dakota Farm Bureau Health Plans — also appear on the state list.
• Several carriers concentrate on the letters most commonly bought today (A, F, G and N), while high-deductible variants (F-HD, G-HD) show up at a smaller group of insurers.

Insurers do occasionally enter or leave a state's Medigap market, or add and drop specific plan letters. To confirm what is actively sold in your ZIP as 2027 begins, run a fresh search at medicare.gov or call the carrier directly.

What to do before January

A short checklist for Sioux Falls readers heading into the new plan year:

1. Pull out your current Medigap policy and note the plan letter, the insurer, and your renewal date. 2. Watch for any rate-adjustment letter from your insurer and read the effective date carefully. 3. Check the 2027 Part B deductible at medicare.gov once CMS posts it, especially if you have Plan G or N. 4. If you are considering a switch, ask about medical underwriting — outside protected windows, it can apply. 5. Call SHIINE (South Dakota's SHIP) for free one-on-one help before you sign anything.