Decision guide · Sioux Falls

Should you and your spouse have the same Medicare plan? A Sioux Falls guide for 2027

Medicare has no couples plan. The drug list that fits one of you can cost the other a lot more.

Big Sioux Benefits Data Desk

Published October 15, 2026 · 20 min read · Sourced from CMS.gov and Medicare.gov

No, you and your spouse don't need the same Medicare plan, and for a lot of Sioux Falls couples the same plan is the more expensive choice. Medicare enrolls people one at a time. Each of you gets your own Part A and Part B, and each of you picks your own Part D drug plan, Medicare Advantage plan, or Medigap policy. The plan that fits your husband's three generics may be the wrong plan for your inhaler, and the reverse happens just as often.

This guide uses the actual 2027 numbers. Every South Dakota and Minnehaha County plan figure below was read directly from CMS's own CY2027 and CY2026 landscape files, downloaded on October 15, 2026, the first day of this year's Open Enrollment. The 2027 Part D limits come from CMS's CY 2027 Rate Announcement. Nothing here comes from memory, a TV ad, or a secondhand summary.

The short answer

Pick your plans separately, then decide whether matching is worth anything to you. That's the whole method. Medicare.gov says Medicare "is different from private insurance" and that "it doesn't offer plans for couples or families. You don't have to make the same choice as your spouse."^[1]

That surprises people who spent 40 years on a family plan through work. On Medicare, you're two separate customers who happen to share a mailbox.

Here's what is per person, every time:

• Part B premium. Each of you pays it. For 2026 the standard amount is $202.90 a month, per CMS.^[7]
• Part D or Medicare Advantage plan. Each of you enrolls, each of you pays the premium, and each of you has your own drug list and your own deductible.
• Medigap. Medicare.gov: "A Medigap policy only covers one person, so if you and your spouse both want Medigap coverage, you each have to buy your own policy."^[2]
• Out-of-pocket limits. The $2,400 Part D cap for 2027 and a Medicare Advantage plan's in-network maximum are each counted on one person's spending, not the household's.

So the real question isn't "can we be on different plans." You can. It's "is there a reason good enough to put both of us on a plan that was chosen for one of us." Sometimes there is. Often there isn't.

How it usually goes wrong at the pharmacy counter

It goes wrong in January, at the pharmacy, when the plan that fit one spouse turns out not to cover the other spouse's drug the same way. The setup is almost always the same, and nobody does anything careless.

One spouse turns 65 first, does the research, maybe talks to a neighbor in Brandon, and lands on a plan. A couple of years later the second spouse turns 65, the household is tired of Medicare mail, and the easy answer is "put me on whatever you have, it's been fine."

It has been fine, for the first spouse. Their drugs were checked. The second spouse's drugs weren't. Maybe it's a brand-name inhaler, an eye drop, a blood thinner, or a newer diabetes drug. The plan covers it, technically, but on a high tier, which is the cost level a plan assigns each drug on its formulary (its list of covered drugs). Or the plan requires a prior authorization, meaning the doctor has to get the plan's approval before it pays. Or the drug isn't on the list at all.

Then January comes. The second spouse hands over the new card, and the pharmacist quotes a price nobody expected. The Part D deductible resets every January 1, and for 2027 the standard deductible is $700.^[4] On a plan that applies that deductible to the drug in question, the first prescription fills of the year can cost hundreds of dollars before the plan starts sharing the cost.

A second version shows up every fall. The couple reads one Annual Notice of Change (ANOC), the letter each plan sends listing next year's changes, and assumes it describes both spouses. On the same plan, the changes can still help one spouse and hurt the other.

Why one plan rarely fits two people

One plan rarely fits two people because Part D plans are built around drug lists, and two people almost never take the same drugs. The premium is the same for both of you, but what each of you pays at the counter depends entirely on your own prescriptions.

A few terms, defined once, because they drive the whole decision:

• Formulary: the plan's list of covered drugs. Each plan writes its own, so a drug can be covered by one 2027 plan and missing from another.
• Tier: the cost level a drug sits on within that formulary. Lower tiers (usually generics) cost less; higher tiers (brand-name and specialty drugs) cost more. The same drug can sit on different tiers in different plans.
• Deductible: what you pay for covered drugs before the plan starts sharing cost. For 2027 the standard Part D deductible is $700, and plans can charge that or less.^[4]
• No-deductible tier: some plans waive the deductible for certain tiers, usually generics. CMS's landscape file flags which plans do this.^[5]
• Out-of-pocket threshold (the cap): once your own covered drug costs reach this amount in a year, you pay nothing more for covered Part D drugs for the rest of that year. It's $2,100 for 2026 and $2,400 for 2027.^[4]
• Network and preferred pharmacy: the doctors (for Medicare Advantage) and pharmacies a plan contracts with. A "preferred" pharmacy usually means lower copays at that store.

Put those together and the problem is plain. A plan's premium is a flat number. Everything else, the tier, the deductible, the prior authorization, depends on what you take. If one spouse takes two generics and the other takes a brand-name inhaler and a specialty drug, the plan with the lowest total cost for the first spouse can cost the second spouse far more, even at the same premium.

There's also a habit at work. A University of Michigan team looked at 1,812 partnered Medicare Advantage enrollees in the national Health and Retirement Study from 2010 to 2018 and published the results in JAMA in 2024. They found 83.8% started the year in the same Medicare Advantage plan as their partner, and when one partner stayed in their plan, 95.7% of respondents stayed too.^[9] The authors found that a person's Medicare Advantage decisions tracked their partner's decisions more closely than the other personal and plan factors they examined.^[9]

The 2027 stand-alone Part D menu in South Dakota

South Dakota has 9 stand-alone Part D plans for 2027, and every one is offered statewide, from Sioux Falls and Tea out to the Black Hills. That's the full list in CMS's CY2027 landscape file, down from 11 in 2026.^[5][6] These are the drug plans you'd pair with Original Medicare, usually alongside a Medigap policy. Here is every one of them:

Source: CMS: CY2027 Medicare Advantage and Part D Landscape File (September 2026 release), every South Dakota PDP row (all listed "All Counties"); 2026 star ratings from CMS: CY2026 Medicare Advantage and Part D Landscape File (September 2026 release). The September 2026 CY2027 file does not yet carry 2027 star ratings. "Enhanced" and "Standard-equivalent" are CMS's Drug Benefit Type labels (Enhanced Alternative and Actuarially Equivalent Standard).

Two plans from the 2026 list have no South Dakota row in the 2027 file: SilverScript Choice (PDP), which was $29.70 a month in 2026, and HealthSpring Extra Rx (PDP), which was $66.50.^[6] If either of you is on one of those, your plan's fall letter should explain what happens next, and you'll need to choose a 2027 plan. Our plan non-renewal guide covers what that means.

Here's the same 2027 menu as a picture, by monthly premium:

Source: CMS CY2027 Landscape File, South Dakota PDP rows, Part D Total Premium. Plan year 2027.

Look at what moved between the two years. Most of these plans raised their premium for 2027. A few went the other way. This is the year-over-year view for the plans that exist in both files:

Sources: CMS CY2026 Landscape File and CMS CY2027 Landscape File, South Dakota PDP rows, matched by contract and plan ID. HealthSpring Assurance Rx appears under contract S5617-123 in 2026 and S5715-043 in 2027.

Two changes stand out for couples. MedicareBlue Rx Standard goes from $101.00 to $179.10 a month, and AARP Medicare Rx Preferred goes from $140.20 to $222.90 with its deductible rising from $130 to $300.^[5][6] If one spouse picked either plan for good reasons in 2026 and the other spouse simply joined, both of you just took that increase. It might still be worth it for the spouse who needs that plan. It's worth checking for the spouse who doesn't. Our 2027 Part D premium guide explains why stand-alone plan premiums moved this year.

What the same plan costs a couple: the real 2027 math

Putting both spouses on the plan chosen for the one with costly drugs can cost the other spouse thousands of dollars a year in premiums alone. The 2027 premium spread in South Dakota is wide enough to make this real money, not rounding error.

We can't know your drug prices without your drug list, and we won't guess. What we can show from CMS's own numbers is the fixed part of each plan: the 12 months of premium you pay no matter what, the most you'd pay before the plan shares cost (the deductible), and the most you could pay in a year for covered drugs (premium plus the $2,400 cap).

Calculated by Big Sioux Benefits from the 2027 premium and deductible in the CMS CY2027 Landscape File and the 2027 out-of-pocket threshold in the CMS CY 2027 Rate Announcement. Per person, plan year 2027. Not CMS-published totals.

Read the table with three limits in mind. The middle column assumes you'd pay the whole deductible, which won't happen if you only take drugs on a no-deductible tier. The worst-case column only covers drugs on the plan's formulary, filled at network pharmacies; a drug the plan doesn't cover at all doesn't count toward the cap. And none of these columns is your actual cost, which depends on your drugs.

Now the couple version. Say one spouse takes a handful of low-cost generics and the other takes brand-name drugs that, after running both lists, genuinely do best on AARP Medicare Rx Preferred from UHC (PDP). If the first spouse simply joins that plan, their 2027 premium is $2,674.80. On Wellcare Value Script (PDP), it's $63.60. That's a $2,611.20 difference in premiums for the spouse who didn't need the richer plan, before a single prescription is filled.^[5]

Illustration only, premiums from the CMS CY2027 Landscape File. It assumes the second spouse's drugs are covered at a similar cost on both plans, which you must confirm with your own list.

That last caveat is the honest part. A cheap plan is only cheaper if it covers your drugs on a reasonable tier. If the spouse with generics also takes one drug that the low-premium plan puts on a high tier, the gap shrinks or flips. That's why the steps later in this guide run each person's list separately. The goal isn't the lowest premium. It's the lowest total yearly cost for each of you.

Couples on Medicare Advantage in Sioux Falls

On Medicare Advantage, two spouses on two different plans is just as allowed, and the stakes are bigger because each plan has its own doctor network, its own drug list, and its own yearly maximum. A Medicare Advantage plan is a private plan that replaces Original Medicare's Part A and Part B for the person enrolled in it, usually with drug coverage built in.

For 2027, CMS's landscape file lists six Medicare Advantage plans with drug coverage in Minnehaha County, not counting Special Needs Plans and Medicare Cost plans. All six are PPOs. Here they are:^[5]

Source: CMS: CY2027 Medicare Advantage and Part D Landscape File (September 2026 release), Minnehaha County rows with CMS category "MA-PD"; 2026 Overall Star Ratings by contract from CMS: CY2026 Medicare Advantage and Part D Landscape File (September 2026 release). Aetna appears under two contract numbers at matching prices in the 2027 file; the one that applies to you is printed on your plan's fall letter. Plan year 2027.

The column couples miss is the MOOP, the in-network maximum out-of-pocket: the most you can owe in a year for covered medical care under that plan. Like the Part D cap, it's per person. If both spouses are on Align SecureChoice or either Aetna plan for 2027, each of you has a $7,150 in-network maximum, so a year where both of you need serious care could reach $14,300 for the household, plus premiums and drug costs.^[5]

The bigger local issue for couples on Medicare Advantage is doctors. Sioux Falls care mostly runs through two large health systems, Sanford and Avera, and Align is Sanford Health Plan's own product, per the parent organization listed in CMS's file.^[5] It's common for spouses to have different primary care doctors, or one spouse to see a specialist the other has never met. Before either of you picks a 2027 plan, confirm each of your doctors with that plan for 2027. Don't assume your spouse's network covers your cardiologist. Our Sanford and Avera network guide walks through how to check.

A mixed setup is allowed too: one spouse on Medicare Advantage, the other on Original Medicare with Medigap and a stand-alone Part D plan.^[1] It's more paperwork, but it can match two very different health pictures.

Couples on Medigap: two policies, two clocks

With Medigap, each spouse buys a separate policy, and each spouse has a separate enrollment window, which usually opens years apart. Medigap (Medicare Supplement Insurance) is private coverage that pays some or all of the costs Original Medicare leaves, like the Part B 20% coinsurance.

Medicare.gov is direct about the first part: a Medigap policy only covers one person, so spouses each buy their own.^[2] There's no "couples Medigap." You can each have the same letter plan from the same company, or different plans from different companies.

The second part matters more, and it's where couples get caught. Your best time to buy Medigap is your own Medigap Open Enrollment Period. CMS's Medigap guide says it's six months long, it "starts the first month you have Medicare Part B and you're 65 or older," and it's "a one-time enrollment period; it doesn't repeat every year."^[3] If you're 67 and your spouse is 64, your windows don't overlap. The younger spouse's window opens when they turn 65 and have Part B, not when you enroll.

Why it matters: outside that window, a Medigap company can generally look at your health history when you apply, unless you have another guaranteed issue right. A healthy older spouse who buys Medigap at 65 and a younger spouse who "waits to match" can end up with very different options later. South Dakota's specific Medigap rules are on our South Dakota Medigap guide, and our Plan G and Plan N comparison covers what each letter plan pays.

What about a discount for being married? CMS's guide lists discounts some insurers offer, "like for women, non-smokers, or married people," among the things that can affect a Medigap premium.^[3] Whether a company offers one, and what it's worth, varies by insurer. Ask in writing, and don't let a discount alone push the second spouse into a plan that doesn't fit.

Part B and IRMAA are per person too

Each spouse pays their own Part B premium, so a couple pays it twice. CMS set the 2026 standard Part B premium at $202.90 a month and the 2026 Part B deductible at $283 a year, per person.^[7] For a married couple on the standard amount, that's $405.80 a month, or $4,869.60 for 2026, before any plan premium. CMS hadn't announced the 2027 Part B premium as of October 15, 2026.

Higher-income couples also pay an IRMAA, the income-related monthly adjustment amount. CMS's fact sheet lists the brackets for joint filers, and the surcharge applies to each spouse's premium:^[7]

Source: CMS: 2026 Medicare Parts A & B Premiums and Deductibles (Fact Sheet, November 14, 2025), full Part B coverage, joint tax returns. Selected rows; the fact sheet lists every bracket. Calendar year 2026.

When the same plan really does make sense

The same plan makes sense when it genuinely fits both of you, or when the simplicity is worth a known, modest cost. This is a real close call for plenty of couples, and "different plans" is not automatically the right answer.

Big Sioux Benefits decision framework, based on Medicare.gov guidance that Medicare has no couples plans^[1] and the per-person Part D and Medigap rules cited above.

Paperwork simplicity deserves real credit. Two plans means two ANOCs and two phone numbers, and for an adult child helping parents in Harrisburg or Sioux Center, two sets of authorization forms. Our authorized representative guide covers the forms that let you talk to a parent's plan.

The fair way to decide: run both lists, see what the gap actually is in dollars, then decide whether one plan's simplicity is worth that number to your household. Some couples will look at a $150 difference and match. Some will look at a $2,000 difference and split. Both are reasonable when the number is known.

How to check this yourself before December 7

You can do this yourself in an evening with two drug lists and Medicare's own Plan Finder. The deadline is real: Medicare.gov says the plan must get your request by December 7 for coverage starting January 1, 2027.^[8]

1. Make two lists, not one. Each spouse's drugs, with the exact name, strength, and how many per month. Include inhalers, eye drops, insulin, and anything filled only a few times a year.
2. Write down each person's doctors and pharmacy. Primary care, specialists, the hospital you'd use, and the pharmacy you actually go to on 41st Street or in Tea.
3. Run Plan Finder twice. On Medicare.gov, enter one spouse's list, note the plans that come out lowest in estimated total yearly cost (premium plus drug costs), then start over for the other spouse. Don't combine the lists. Our Plan Finder guide shows each screen.
4. Check tiers and restrictions on the drugs that matter most. For each plan you're considering, look up the costly drugs on its 2027 formulary. Note the tier and any prior authorization or quantity limit. Our formulary tiers guide explains what each tier usually costs.
5. Compare totals, not premiums. For each person, compare the estimated yearly total from Plan Finder, then compare the household total for "same plan" versus "each person's lowest plan."
6. For Medicare Advantage, confirm each person's doctors for 2027. Call the plan or the doctor's office and ask specifically about 2027, not this year.
7. Decide what matching is worth. If the gap is small and one plan is simpler for your household, matching is a fine choice. If it's large, split.
8. Enroll each person separately. Each spouse needs their own enrollment, with their own Medicare number.

Not sure whether either of your plans changed for 2027? Pull out both Annual Notices of Change and read them side by side. If you can't find one, we can look it up with you.

How we help couples with this

We run both of your drug lists and both of your doctor lists against the plans we offer, then show you the household total for matching versus splitting. You decide. It's a free conversation, in person in Sioux Falls or by phone, and carriers pay us, not you.

Big Sioux Benefits is a licensed independent insurance agency. We are not connected with or endorsed by the U.S. government or the federal Medicare program. We do not offer every plan available in your area. Any information we provide is limited to those plans we do offer in your area. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options.

What you end up with

You end up with each spouse on a plan picked for their own drugs and doctors, and a known number for what that costs your household in 2027. Concretely:

• Each person's prescriptions checked against the 2027 formulary before January, not at the pharmacy counter.
• Each person's doctors confirmed for 2027.
• A household premium figure for "same plan" and "separate plans," so the trade-off is a number, not a guess.
• A short list of what changes for each of you on January 1, so neither spouse is surprised.

What to watch for 2027

1. December 7, 2026 is the last day for a plan to receive your 2027 enrollment, per Medicare.gov.^[8]
2. The 2027 Part B premium hasn't been announced as of this writing. CMS's 2026 figure is $202.90 per person.^[7]
3. The 2027 Part D deductible and cap rise to $700 and $2,400 per person.^[4] Budget for both resetting on January 1, for each of you.
4. Two South Dakota stand-alone plans, SilverScript Choice and HealthSpring Extra Rx, have no 2027 row in CMS's file.^[5][6] Anyone on them needs a new 2027 plan.
5. 2027 star ratings weren't yet in CMS's September 2026 landscape file. Check our 2027 star ratings guide for the published ratings.

How we know all this: Big Sioux Benefits runs every article through a data desk that reads CMS's own files directly, here the full CY2026 and CY2027 Medicare Advantage and Part D landscape files and the CY 2027 Rate Announcement, rather than secondhand summaries. It's built by Strategic AI Architects. Every figure on this page was fetched or calculated from its primary source on October 15, 2026 and carries the plan year it covers. Totals marked as calculated are our own arithmetic on CMS figures, not CMS-published numbers. This is education, not advice; confirm your own plan, drug costs, and eligibility with your plan, Medicare.gov, or a licensed agent. We take no payment from any carrier to feature a plan.