2027 open enrollment. 3.15M must pick a new plan.

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Vlada / Medicare Advantage / Illinois

Medicare Advantage plan exits 2027 in Illinois, by county

62,500 of Illinois's 807,394 Medicare Advantage members (7.7%) 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
807,394
members, Sept 2026
must pick for 2027
62,500
must pick for 2027
share of members
7.7%
share of members
counties
102
counties

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

Members of individual Medicare Advantage plans in Illinois 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.

021k42k63k84k2.0%20166.3%20173.5%20181.4%20190.4%20200.3%20210.3%20222.5%20230.4%20245.1%202511.8%20267.7%2027

Every Illinois 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.

CountyMembers, Sept 2026Must pick for 2027ShareOffered a new or renumbered planCompany gone
Cook327,01212,2743.8%670
McHenry17,4198,65349.7%01,215
DuPage52,1814,4158.5%6160
Will36,5022,7117.4%00
Peoria16,0382,69816.8%2,301259
Lake34,9092,4367.0%01,809
Kane27,7282,4358.8%4170
Madison25,5992,2398.7%1,367131
Tazewell11,5052,17518.9%1,912174
St. Clair25,1841,8587.4%1,2190
Williamson3,0141,52750.7%29824
Randolph2,0101,43071.1%013
Champaign11,1261,15110.3%1,1510
Piatt1,43993464.9%014
Vermilion8,04385010.6%81436
Kankakee5,96282113.8%4450
Monroe3,51968319.4%5750
Knox4,76166614.0%58945
Jackson2,65863724.0%0294
Morgan1,99560730.4%0115
Winnebago31,2895931.9%12311
Shelby1,03455553.7%00
Kendall5,7255409.4%0314
Franklin2,19748922.3%0118
Logan1,65645627.5%012
Woodford2,30241017.8%028
Adams4,4033999.1%0116
McLean9,0273974.4%0305
Iroquois1,57939425.0%045
Macoupin3,44337610.9%00
DeKalb4,4173487.9%0151
De Witt1,08534031.3%00
Ford72932043.9%00
Sangamon12,0652762.3%0276
Edgar1,01026726.4%055
Livingston2,30526511.5%037
La Salle5,6572624.6%0206
Cass65926039.5%00
Ogle4,2612455.7%049
Saline1,24523819.1%00
Marion1,89322111.7%00
Menard67320530.5%032
Rock Island14,4031771.2%17160
Union83216820.2%035
Johnson52716230.7%033
Richland66614121.2%00
Jefferson1,3791359.8%018
Clinton2,2261346.0%410
Schuyler28013146.8%00
Macon6,9561241.8%0124
Lawrence53212423.3%00
Massac71211616.3%00
Washington54711521.0%00
Boone4,4391082.4%040
Jersey1,9561085.5%360
Bond1,2491018.1%011
Perry9069610.6%024
Warren983959.7%095
Grundy1,867844.5%014
Coles3,199822.6%082
White6077211.9%00
Wayne5007214.4%014
Pike5937112.0%015
Lee2,133643.0%064
Greene708649.0%330
Crawford654599.0%059
Brown1285946.1%00
Henry4,150571.4%057
Stephenson6,023560.9%00
Pulaski3115417.4%011
Bureau1,811502.8%050
Christian2,499481.9%048
Alexander492489.8%00
Montgomery1,693462.7%012
Hancock860435.0%043
Wabash2384217.6%00
Fulton2,668401.5%040
Mercer1,358342.5%034
Effingham1,312322.4%032
Whiteside4,458310.7%031
Fayette980293.0%00
Gallatin1812413.3%00
Pope1092422.0%00
Edwards1212319.0%00
Marshall893222.5%022
Hamilton238218.8%00
McDonough1,220181.5%018
Hardin1011817.8%00
Clark1,189110.9%011
Jo Daviess1,091111.0%011
Douglas1,47600.0%00
Carroll1,28500.0%00
Mason86700.0%00
Moultrie69300.0%00
Cumberland68500.0%00
Henderson45700.0%00
Clay39600.0%00
Stark37100.0%00
Jasper36500.0%00
Putnam19600.0%00
Calhoun19000.0%00
Scott17700.0%00
Illinois, 102 counties807,39462,5007.7%11,6418,192

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.

Illinois against the nation

MeasureIllinoisUnited States
Must pick a new plan for 202762,5003,153,512
Share of members7.7%10.6%
Share for 202611.8%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

Measure20272026Change
Members in contracts rated 4+ stars82.0%49.5%+32.5 pts
Member-weighted average star4.063.90+0.15
Rated contracts40

Members by star, 2027: 5.0: 1,706 · 4.5: 342,052 · 4.0: 467,681 · 3.5: 120,831 · 3.0: 57,087 · 2.5: 29; 91,016 in unrated contracts. CMS Star Ratings released 2026-10-08, each contract's overall star weighted by its 2026-10 members in Illinois (individual and group); rating year 2027 pays in 2028.

By company, 2027

CMS parent organizations with members in Illinois 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.

CompanyMembersMust pickShare of own membersPlan terminatedService area reducedOffered a new or renumbered planCompany gone
Health Care Service Corporation52,48421,66041.3%19,7601,9001,1518,192
CVS Health Corporation173,40816,7349.7%11,8774,8574,6650
Humana Inc.300,32215,1705.1%7,9417,22900
Centene Corporation47,9535,82512.1%1385,6875,8250
UnitedHealth Group, Inc.168,9382,9451.7%2,02192400
Molina Healthcare, Inc.14,8831661.1%166000
Zing Health Consolidator, Inc19,18400.0%0000
Devoted Health, Inc.14,33000.0%0000
Lumeris Group Holdings Corporation13,82500.0%0000
Rifkin Managed Care Holding, LLC1,10100.0%0000
Longevity Health Founders, LLC96600.0%0000

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 Illinois, by county. https://www.vladahealth.com/medicare-advantage/il. 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 Illinois; 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 Illinois must pick a new plan for 2027?
62,500 of 807,394 members (7.7%): 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 Illinois county has the most members who must pick?
Cook County: 12,274 of 327,012 members (3.8%). 0 of the 102 counties lose 90% or more of their members' plans; 12 lose none.
Which company ended the most plans in Illinois for 2027?
Health Care Service Corporation: 21,660 of its 52,484 Illinois members (41.3%) are in a plan it does not sell in their county for 2027.
How did Illinois's Star Ratings change for 2027?
82.0% of members are in contracts rated 4 stars or more for 2027, against 49.5% the year before; the member-weighted average star is 4.06, from 3.90, over 40 rated contracts.
How does 2027 compare with 2026 in Illinois?
83,805 members (11.8%) had to pick a new plan for 2026; for 2027 it is 62,500 (7.7%), a change of -21,305 members.

Ask this in Claude or ChatGPT

The free Vlada connector answers it from the same files, with the source and a response hash. Install in one minute.

Use Vlada. Which Illinois 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 IL) and get_stars_rollup (group_by state).