Year
State / Region
Plan Type
Carrier
Never refreshed
MA Enrollees
Original Medicare
MA Penetration
Total Medicare
Enrollees in 4+ Stars
MA Penetration Trend
2019–Feb 2026 · 35M+ in MA · CMS monthly data
MA Enrollees
Original Medicare
Total
CMS Monthly Enrollment · 2019–Feb 2026 · data.cms.gov—
YoY Growth Rate
Growth slowing: +3% in 2026 vs avg +9%/yr 2007–2024
Computed from CMS monthly snapshots
Enrollment by State
2026 enrollment estimates · Click row to drill state trend
| State ↕ | MA Enrollees ↕ | Orig. Medicare ↕ | Total ↕ | MA % ↓ | Trend |
|---|---|---|---|---|---|
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Top States by MA%
Top 8
Monthly Enrollment Timeline
2019–2026 · Live CMS data · Select geography to drill
CMS Monthly Enrollment · 2019–Feb 2026
MA Penetration Rate %
MA penetration 2019–2026 · crosses 50% in 2023
Derived: MA ÷ Total
State Enrollment Ranking
2026 enrollment · Click any bar to drill into state trend
CMS Monthly Enrollment 2026 · State & Territory · Click bar to drill
5-Star Plans (2026)
11
↓ from 36 in 2024 · CMS Oct 2025
Plans Rated 4+ Stars (2026)
40%
↓ from 51% in 2023 · CMS 2026
Low Performers 2026
8
↑ from 6 in 2025 · CMS Oct 2025
Enrollees in 4+ Stars (2026)
62%
↓ from 74% in 2024
Star Rating Distribution 2022–2026
Number of MA-PD contracts per tier per year
5★
4.5★
4★
3.5★
≤3★
CMS Part C&D Star Ratings Fact Sheets 2022–2026
Avg Star Rating Trend
For-profit vs Non-profit, enrollment-weighted
CMS Star Ratings Technical Notes
Five-Star Plan Directory — 2026
CMS 2026 five-star contracts · 11 total (↓ from 36 in 2024) · Published Oct 2025
| Organization | Parent Company | Type | State | Rating | D-SNP | Beneficiaries |
|---|
CMS 2026 Star Ratings Fact Sheet · October 2025
Avg Monthly Premium
$14.00
↓ $3.80 from 2025 · CMS
Plans with $0 Premium
67%
↓ 4 pts YoY · KFF
Median In-Network MOOP
$5,900
↑ $500 from 2025 · Avalere
Plans w/ Dental
98%
↑ 4 pts · KFF 2026
Carrier Market Share
By national MA enrollment · click to isolate
CMS Contract Summary · Enrollment-weighted
Plan Type Mix
2026: HMO 57% · PPO 32% · SNP +19% · 3,373 individual plans
CMS Contract Summary 2025
Premium Distribution
2026: 67% MA-PDs at $0 premium · avg $14.00/mo (CMS)
CMS Landscape Files 2025
Supplemental Benefit Adoption
2026: dental 98%, vision 99%, hearing 98% · OTC declined to 66% (KFF)
CMS PBP Files 2025
Carrier Avg Star Rating
2026 · Kaiser 4.8★ leads · Centene 3.1★ lowest · CMS Star Ratings
CMS Star Ratings 2026 · Carrier Roll-up
Carrier Analytics Detail
2026 enrollment · Sortable — click any header to reorder
| Carrier ↕ | Enrollment ↕ | Mkt Share ↕ | Plans ↕ | Avg ★ ↕ | Avg Premium ↕ | Avg MOOP ↕ | YoY ↕ |
|---|
ZIP Code
Max Premium
Min Stars
Dental
Sort
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2026 CMS enrollment data
2026 Key Changes
IRA · Part D 2026 · CMS Updates