How many Medicare Advantage members in South Dakota must pick a new plan for 2027?

18,074 of 44,129 members (41.0%): their plan is not sold in their county for 2027 according to the CMS crosswalk and Landscape. Nationally the share is 10.6% (3,153,512 members).

Which South Dakota county has the most members who must pick?

Minnehaha County: 4,959 of 9,049 members (54.8%). 9 of the 51 counties lose 90% or more of their members' plans; 5 lose none.

Which company ended the most plans in South Dakota for 2027?

Blue Cross Blue Shield of Michigan Mutual Ins. Co.: 10,445 of its 10,445 South Dakota members (100.0%) are in a plan it does not sell in their county for 2027.

How did South Dakota's Star Ratings change for 2027?

59.3% of members are in contracts rated 4 stars or more for 2027, against 24.8% the year before; the member-weighted average star is 3.66, from 3.71, over 11 rated contracts.

How does 2027 compare with 2026 in South Dakota?

25,745 members (57.9%) had to pick a new plan for 2026; for 2027 it is 18,074 (41.0%), a change of -7,671 members.

2027 open enrollment. 3.15 million people must pick a new Medicare Advantage plan. See every plan and county, free.3.15M must pick a new plan.

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Vlada / Medicare Advantage / South Dakota

Medicare Advantage plan exits 2027 in South Dakota, by county

18,074 of South Dakota's 44,129 Medicare Advantage members (41.0%) are in a plan that is not sold in their county for 2027, measured from the CMS 2027 Landscape and crosswalk against September 2026 enrollment. Nationally the share is 10.6%.

Period: plan year 2027 against September 2026 members · Updated 2026-10-19 · Next: CMS January 2027 enrollment (February 2027): where the members landed

members, Sept 2026: 44,129; members, Sept 2026
must pick for 2027: 18,074; must pick for 2027
share of members: 41.0%; share of members
counties: 51; counties

Members who must pick a new plan each year, 2016 to 2027

Members of individual Medicare Advantage plans in South Dakota whose plan is not sold in their county the next year, by plan year; the share of all members at the top of each bar. Orange: the last three years.

Every South Dakota county, 2027

Members in September 2026; those whose plan is not sold in their county for 2027; their share; of those, the members offered a new or renumbered plan by their own company in the county, and the members whose company sells no plan there for 2027. Sorted by members who must pick. Each county links to its own page: the plans that end, the companies, enrollment and penetration since 2015, the Stars.

County	Members, Sept 2026	Must pick for 2027	Share	Offered a new or renumbered plan	Company gone
Minnehaha	9,049	4,959	54.8%	2,929	2,030
Pennington	8,441	2,215	26.2%	637	1,578
Lincoln	2,502	1,659	66.3%	841	818
Brookings	2,619	1,426	54.4%	287	1,139
Davison	1,785	997	55.9%	78	919
Lawrence	2,784	960	34.5%	216	744
Meade	2,000	588	29.4%	153	435
Codington	3,145	489	15.5%	489	0
Roberts	742	383	51.6%	255	128
Butte	1,100	381	34.6%	62	319
Custer	953	291	30.5%	68	223
Yankton	602	253	42.0%	0	253
Turner	363	250	68.9%	89	161
Day	523	233	44.6%	181	52
Lake	327	208	63.6%	57	151
Kingsbury	439	202	46.0%	39	163
Clay	398	198	49.7%	80	118
Fall River	686	194	28.3%	45	149
Deuel	436	194	44.5%	80	114
Beadle	320	149	46.6%	0	149
McCook	267	147	55.1%	62	85
Charles Mix	251	134	53.4%	0	134
Clark	425	130	30.6%	87	43
Marshall	347	121	34.9%	90	31
Hutchinson	194	120	61.9%	13	107
Walworth	142	114	80.3%	0	114
Bon Homme	196	110	56.1%	0	110
Moody	168	106	63.1%	12	94
Hanson	145	103	71.0%	0	103
Sanborn	178	101	56.7%	13	88
Spink	423	96	22.7%	57	39
Hamlin	562	86	15.3%	70	16
Union	811	85	10.5%	0	85
Miner	83	68	81.9%	0	68
Douglas	92	63	68.5%	0	63
Aurora	55	55	100.0%	0	55
Edmunds	45	45	100.0%	0	45
Haakon	31	31	100.0%	0	31
Brule	28	28	100.0%	0	28
Harding	18	18	100.0%	0	18
Perkins	16	16	100.0%	0	16
Corson	44	15	34.1%	0	15
Jackson	47	14	29.8%	0	14
McPherson	14	14	100.0%	0	14
Jerauld	13	13	100.0%	0	13
Gregory	12	12	100.0%	0	12
Brown	195	0	0.0%	0	0
Dewey	48	0	0.0%	0	0
Hughes	40	0	0.0%	0	0
Ziebach	13	0	0.0%	0	0
Hand	12	0	0.0%	0	0
South Dakota, 51 counties	44,129	18,074	41.0%	6,990	11,084

Download this table (CSV, CC BY 4.0) · cells under 11 members are suppressed by CMS and count as zero, so every count is a floor.

South Dakota against the nation

Measure	South Dakota	United States
Must pick a new plan for 2027	18,074	3,153,512
Share of members	41.0%	10.6%
Share for 2026	57.9%	10.1%

National figures: the Vlada report 3.15 million Medicare Advantage members must pick a new plan for 2027.

Star Ratings 2027, member-weighted

Measure	2027	2026	Change
Members in contracts rated 4+ stars	59.3%	24.8%	+34.5 pts
Member-weighted average star	3.66	3.71	-0.05
Rated contracts	11

Members by star, 2027: 4.5: 7,872 · 4.0: 27,286 · 3.0: 24,142; 303 in unrated contracts. CMS Star Ratings released 2026-10-08, each contract's overall star weighted by its 2026-10 members in South Dakota (individual and group); rating year 2027 pays in 2028.

By company, 2027

CMS parent organizations with members in South Dakota in September 2026: members whose plan is not sold in their county for 2027, as a share of the company's own members; how the plan went (terminated, or its service area reduced so it continues elsewhere but not in their county); of those members, how many the company offers a new or renumbered plan of the same type in the county, and how many are left with no plan from the company there.

Company	Members	Must pick	Share of own members	Plan terminated	Service area reduced	Offered a new or renumbered plan	Company gone
Blue Cross Blue Shield of Michigan Mutual Ins. Co.	10,445	10,445	100.0%	10,445	0	0	10,445
Sanford Health	4,730	4,472	94.5%	4,472	0	4,472	0
Medica Holding Company	17,807	2,518	14.1%	0	2,518	2,518	0
CVS Health Corporation	4,921	639	13.0%	0	639	0	639
UnitedHealth Group, Inc.	6,226	0	0.0%	0	0	0	0

Sources

CMS Medicare Advantage/Part D Landscape, plan year 2027: landscape_cy2027-landscape-202609-1.zip (CMS, September 2026).
CMS plan crosswalk, CY2027; CMS monthly enrollment by contract, plan and county, 2026-09.
CMS Star Ratings 2027, released 2026-10-08.
Page object written 2026-10-19; the series 2016 to 2027 from the locked exits history of the Vlada report (independent audit 2026-10-13).

Receipts: athena(table=medicare_semantic.exits_cells_county_2027_v1, block=counties) bce72deb8c12…; athena(table=medicare_semantic.exits_cells_county_2027_v1, block=companies) 15de170f7bb5…; get_stars_rollup(group_by=state, limit=60) 2c1fa6b01add…; file(path=docs/research/plan-exits-2027/data/audited/by_year_state.csv) b2f25ce9152e…. Suppressed cells (under 11 members) count as zero in every count.

Cite: Vlada Health (2026). Medicare Advantage plan exits 2027 in South Dakota, by county. https://www.vladahealth.com/medicare-advantage/sd. Data: CC BY 4.0.

Method

Population: members of individual Medicare Advantage plans (H and R contracts, plans 001 to 799, special needs plans included; employer group, Cost, MMP and PACE excluded) in the county in September 2026.
Must pick: the CMS crosswalk names no successor plan sold in the member's county for 2027; members CMS moves to a successor in their county are not counted.
Company: CMS's reported parent organization in September 2026; a company's share is over its own members in the state.
Stars: each contract's overall star weighted by its members in South Dakota; unrated contracts counted apart, never as zero stars.
Suppression: CMS hides cells under 11 members; they count as zero, so every count is a floor and every share is not.

The full method, with the national tables: How we counted, and how to check it.

Questions

How many Medicare Advantage members in South Dakota must pick a new plan for 2027?: 18,074 of 44,129 members (41.0%): their plan is not sold in their county for 2027 according to the CMS crosswalk and Landscape. Nationally the share is 10.6% (3,153,512 members).
Which South Dakota county has the most members who must pick?: Minnehaha County: 4,959 of 9,049 members (54.8%). 9 of the 51 counties lose 90% or more of their members' plans; 5 lose none.
Which company ended the most plans in South Dakota for 2027?: Blue Cross Blue Shield of Michigan Mutual Ins. Co.: 10,445 of its 10,445 South Dakota members (100.0%) are in a plan it does not sell in their county for 2027.
How did South Dakota's Star Ratings change for 2027?: 59.3% of members are in contracts rated 4 stars or more for 2027, against 24.8% the year before; the member-weighted average star is 3.66, from 3.71, over 11 rated contracts.
How does 2027 compare with 2026 in South Dakota?: 25,745 members (57.9%) had to pick a new plan for 2026; for 2027 it is 18,074 (41.0%), a change of -7,671 members.

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Use Vlada. Which South Dakota counties have the most Medicare Advantage members who must pick a new plan for 2027? Give me a table with the members in the market, the members who lose their plan and the share, then the source file, the data vintage and the response hash.

Behind it: get_landscape_exits (transition_year 2026, group_by county, state SD) and get_stars_rollup (group_by state).