2027 Medicare Special Needs Plans in Ontario County, NY

Primary CMS datasets used for this Medicare Special Needs Plan county resource.

Data Source	Publisher	CMS Version
Landscape Source Files	Centers for Medicare & Medicaid Services	CY2027 Landscape (202609.1)
Medicare Part C & D Performance	Centers for Medicare & Medicaid Services	2027 Star Ratings Data Tables
Plan Benefits Package	Centers for Medicare & Medicaid Services	PBP Benefits-2027
Monthly Enrollment by Contract/Plan/State/County	Centers for Medicare & Medicaid Services	2026-09

All plan counts, enrollment totals, averages, and percentage distributions are calculated at the county level using CMS data and include Medicare Special Needs Plans (SNP) only, based on a consistent aggregation methodology.

Data sources and methodology documentation.

Secondary Medicare references and explanatory resources.

Publisher	Reference	Last Accessed
Medicare.gov	Understanding Medicare Advantage Plans	20 August, 2026
Medicare.gov	Compare Original Medicare & Medicare Advantage	22 August, 2026
NCOA.org	5 Steps to Choosing the Right Medicare Plan for You	24 August, 2026

MedicarePlans.com is an independent, non-government informational resource and is not affiliated with or endorsed by the U.S. Government or the federal Medicare program.

Data provenance is documented in accordance with the U.S. Core Data for Interoperability (USCDI) Provenance standard .

Page content independently curated and maintained by David W. Bynon, Editorial Steward, using a standardized, data-driven methodology for accurate, non-commercial Medicare plan interpretation and resolution.