Independent Medicare market intelligence · Public CMS data · April 2026 county file, ingested July 31, 2026

Medicare market answers you can defend in the room.

Built on named CMS datasets for brokers planning AEP, strategy and finance teams sizing markets, and analysts who need the source file. Every figure carries its vintage, a provenance panel, a ready-made citation — and a "so what."

What do you want to figure out?

Where is Medicare Advantage gaining or losing share, and how fast? How does a plan or carrier compare on enrollment, stars, and exits? Where is Medicare drug spend and benefit value moving? What does the latest CMS policy change mean for my market? Where are winnable members, and what wins them?

Find your market

Type a state or county to jump straight to it, start from one of the largest markets, or open the explorer for all 3,199 counties. April 2026 CMS county file.

Los Angeles, CA57.3%977,518 in a health plan Maricopa, AZ51.2%416,326 in a health plan Harris, TX61.1%403,606 in a health plan Cook, IL44.8%397,598 in a health plan Miami-Dade, FL75.4%394,113 in a health plan Queens, NY60.9%256,687 in a health plan Wayne, MI64.9%228,690 in a health plan Allegheny, PA68.8%194,676 in a health plan

Explore all 3,199 counties → filter by health plan share, momentum and market size. Weighing more than one? Compare markets side by side →

Browse markets

Largest markets

Medicare beneficiaries, CMS state record, April 2026

California7,218,783
Florida5,319,022
Texas4,999,773
New York4,042,202
Pennsylvania3,030,753

Highest MA & other health plan share

CMS state record, April 2026

Puerto Rico86.7%
Michigan63.6%
Alabama61.4%
Rhode Island59.9%
Maine58.9%

Fastest growing

12-month change in share, counties with 20,000+ beneficiaries

Most headroom

Lowest share, counties with 20,000+ beneficiaries

Browse all states and counties → the full directory, all 53 jurisdictions and 3,199 counties.

What you can use today

Live capabilities only. Everything in beta or planned is on the roadmap, not in this list.

Market

Competitive

Go to market

Policy and provenance

This cycle's headline numbers

live static extract curated modeled What these labels mean →

What share of Medicare beneficiaries are enrolled in Medicare Advantage or another Medicare health plan?

live

51.1%

April 2026 CMS national record · 36,012,033 of 70,408,037 beneficiaries in MA or another Medicare health plan · summing county rows gives 51.6%, see the reconciliation

See the trend →

Which counties are gaining health plan share fastest?

live

+7.2 pts

De Soto, LA → 56.1% · April 2026 CMS Medicare Monthly Enrollment

Explore counties →

Which carriers are losing stars?

static extract

3.4★

Humana, -0.4 since 2023 · 2026 Star Ratings (published Oct 2025)

See star movement →

How far are negotiated prices below the CMS list price?

static extract

−$9,141

Stelara (ustekinumab): CY2026 negotiated price vs CMS comparison list price, standardized 30-day supply · effective Jan 2026

See the drug list →

New in the data CMS Medicare Monthly Enrollment — April 2026 county file, ingested July 31, 2026, covering all 3,199 US counties. Notable: the MA-and-other health plan share is 51.1% on the CMS national record. Puerto Rico leads all jurisdictions at 86.8%. Read the release briefing →

Start from your task

Jump straight to the answer set that matches the work in front of you.

Marketing & GrowthI’m building a Medicare growth planMarket opportunity, D-SNP landscape, competitive context, policy timing Strategy & corp devI'm evaluating a market entryCounty momentum + market headroom, CSV-ready Payer strategyI'm benchmarking plansStar trajectories, measure erosion, exit signals Market accessI'm sizing drug-spend impactIRA negotiated prices and the OOP-cap shift Finance & diligenceI'm prepping a board deckThe citable national picture with basis notes Brokers & field salesI'm planning AEP territoriesContestable members, market headroom, battlecards, CSV-ready AnalystsI need the underlying tablesVersioned CSV downloads with the same vintages as the charts

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Built to be cited

Most Medicare stats you'll find online are undated and unsourced. Everything here is engineered so you can put it in front of a client, a CFO, or a diligence committee.

Named sources & vintages

Every figure names its CMS file and states its data vintage — Monthly Enrollment, CPSC, Star Ratings, Part D parameters. No undated charts, anywhere.

Provenance on every chart

An expandable panel under each figure: method, basis notes, limitations, and a link to the exact CMS source file.

Honest status labels

Live pulls, static extracts, curated notes, and modeled series are labeled apart — so you know exactly what kind of number you're quoting.

So what / Now what

Each answer ends with what the number means and the concrete next moves — pre-formatted citation included, ready for your deck.

Monthly enrollment ingests · annual stars (Oct) and Part D parameters (Apr) · Methodology, source registry & limitations · About MedicareInsights →

What should I do next?

Work the county listFilter and rank all 3,199 counties SNP enrollmentD-SNP, C-SNP and I-SNP by plan and state Open my workspaceSaved markets, analyses and alerts See ProfessionalUnlimited saves, alerts and exports