How is Medicare Advantage developing in Illinois?

Q: How is Medicare Advantage developing in Illinois?

Illinois MA penetration is 55% (rank 31 of 52) with 1.329M MA enrollees of 2.416M Medicare beneficiaries, February 2026.

Data through February 2026 · Updated June 15, 2026 live

Illinois's MA penetration is 55% — below the 57.8% national share by 2.8 points, ranking 31 of 52 with 1.329M MA enrollees of 2.416M Medicare beneficiaries as of February 2026.

55%

MA penetration

February 2026

#31

National rank (of 52)

February 2026

1.329M

MA enrollees

February 2026

17%

SNP share of MA (D-SNP 13%)

February 2026

13.9%

Dual-eligible share of Medicare

2025 Q4

Tracked counties in Illinois — drill down

County table with momentum

County	Penetration	YoY pts	D-SNP %	Carriers	Top carrier
Winnebago	52.4%	+0.87	20%	3	UHC
Cook	51.4%	+0.87	22%	6	BCBS
Will	50.2%	+0.87	15%	4	Centene
DuPage	48.6%	+0.87	11%	4	BCBS
Kane	47.8%	+0.87	14%	3	Centene
LaSalle	43.2%	+0.87	18%	2	BCBS

Tracked carrier positions in Illinois

Carrier	Enrollment (K)	Plans	Stars	YoY trend	Note
BCBS	298	6	4	+2.4%	Chicago and suburban IL
Humana	168	5	3.5	-4.1%	Chicago suburban markets

Carrier coverage is the curated major-carrier extract (March 2026) — not all carriers in the state.

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Citation: MedicareInsights. “How is Medicare Advantage developing in Illinois?.” CMS Medicare Monthly Enrollment (data.cms.gov, public API), data through February 2026. https://medicareinsights.org/market/states/il/.

Sales playbook one-pager

↓ Download the Illinois sales playbook (PNG): a branded snapshot of penetration, runway class, carrier positions, D-SNP gap, and contestable members for this state. Runway class and score are a MedicareInsights modeled index, never citable as CMS data; source vintages are printed on the image.

So what / Now what

Illinois is a switcher market — expansion means winning members from incumbent MA plans on benefits, network, and brand.

Compare against neighboring states on the national table.
Drill into the county table above; velocity, D-SNP share, and top-carrier columns show where and how growth is happening.
Check 2026 plan exits for orphaned membership contestable in this market.
Sales teams: see where this state ranks on the growth runway index and which competitive facts apply on the carrier battlecards.

Provenance — MA enrollment & penetration by state

Source file: CMS Medicare Monthly Enrollment (data.cms.gov, public API)
Vintage: February 2026
Last updated: June 15, 2026
Refresh cadence: Monthly (CMS publishes ~3 months in arrears)
Method: State-level rows pulled from the Medicare Monthly Enrollment API; MA share = MA_AND_OTH_BENES / TOT_BENES. Refreshed via automated pipeline from the CMS public API.
Known limitations: Penetration here is share of all Medicare beneficiaries (Parts A and/or B), not the KFF eligible-only basis, which runs ~4pts higher.