1,500,194
Total Medicare beneficiaries
50.3%
On Medicare Advantage
49.7%
On Original Medicare
$202.90
Standard Part B premium (2026)
Medicare Enrollment by County in Arizona
The 15 most-populous counties by Medicare beneficiaries. Click any column heading to sort. Medicare Advantage percentage is the share of each county’s beneficiaries enrolled in an MA or other health plan.
| Maricopa County | 782,551 | 50.5% |
| Pima County | 256,914 | 55.7% |
| Pinal County | 100,980 | 55.8% |
| Yavapai County | 93,239 | 41.3% |
| Mohave County | 75,733 | 50.7% |
| Yuma County | 43,780 | 48.5% |
| Cochise County | 37,048 | 46.7% |
| Navajo County | 27,381 | 37.3% |
| Coconino County | 23,575 | 33.9% |
| Gila County | 18,220 | 40.9% |
| Apache County | 14,779 | 30.3% |
| Santa Cruz County | 11,636 | 64.6% |
| La Paz County | 6,608 | 45.2% |
| Graham County | 6,424 | 54.5% |
| Greenlee County | 1,322 | 49.5% |
Key Findings: Medicare in Arizona
- 1Arizona has about 1.5 million Medicare beneficiaries, concentrated heavily in metro Phoenix.
- 2The state is almost evenly split between coverage types — 50.3% Medicare Advantage and 49.7% Original Medicare.
- 3Maricopa County holds more than half of the state’s beneficiaries (about 783,000), at 50.5% Medicare Advantage.
- 4Rural northern counties have the lowest MA penetration — Apache (30.3%) and Coconino (33.9%) — reflecting thinner provider networks.
- 5Arizona expanded Medicaid (AHCCCS), which affects dual-eligible options for lower-income beneficiaries.
How Arizona Compares to National Averages
Medicare Advantage penetration
Arizona is at 50.3%, 3.7 points below the national average of about 54%.
Plans available
Nationally, the average beneficiary can choose from about 32 Medicare Advantage prescription-drug plans for 2026. The exact number available depends on your county.
Medicare Supplement (Medigap)
Nationally, about 41.9% of Original Medicare beneficiaries carry a Medigap policy (AHIP, 2023). State-by-state Medigap rates are not published in an open dataset, so this figure is national. In Arizona, 49.7% of beneficiaries are in Original Medicare and therefore eligible to buy Medigap.
Find the Best Medicare Plan in Your Arizona County
The right plan depends on where you live. Get a free, personalized review of the Medicare options available in your Arizona county from a licensed advisor.
Get My Free Medicare ReviewMethodology & Sources
Enrollment and county data: Centers for Medicare & Medicaid Services, Medicare Monthly Enrollment, 2024 (data.cms.gov). Figures are 2024 annual counts. Medicare Advantage percentage = (beneficiaries in Medicare Advantage & Other Health Plans ÷ total beneficiaries) × 100. The county table shows the 15 most-populous counties of 15 total.
Part B premium: CMS, 2026 Medicare Parts A & B Premiums and Deductibles. The standard premium is set federally and is the same in every state; higher-income beneficiaries pay an income-related adjustment (IRMAA).
Plan counts and Medigap: KFF, Medicare Advantage 2026 Spotlight (CMS Landscape files); AHIP, The State of Medicare Supplement Coverage, 2023. These are reported as national figures only.
Limitations: Medicare Supplement (Medigap) enrollment and per-county plan counts are not available in an open dataset at the state or county level, so they are not shown per county. Percentages are rounded. Last updated 2026-06-11.
This page is for educational purposes. HealthPlan Connect is not affiliated with or endorsed by CMS or any government agency. Contact a licensed advisor for current plan options in your area.