# Atlas Commons research objects — Medicare plans in Middlesex, Massachusetts (CY2026) — context brief

CMS CY2026 Medicare Advantage and Part D plans available in Middlesex, Massachusetts: plan count (AGGREGATED), premium range (RECORDED from CMS Landscape Files), CMS star ratings (DETERMINATION — CMS-issued institutional quality rating), and epistemic boundary (INTERPRETATION). Premiums are base plan premiums; actual cost depends on Part B premium, IRMAA, and LIS. Star ratings are CMS quality scores. This surface informs; it does not rank or advise. Use medicare.gov/plan-compare to enroll. CC0.

Claims (warrant · source), each re-fetchable to verify:

- **49 Medicare plans are available in Middlesex, Massachusetts for contract year 2026** — DERIVED · CMS CY2026 Medicare Landscape Files (https://www.cms.gov/medicare/health-drug-plans/medicare-advantage/plan-information/plan-information)
- **Monthly premiums for Medicare plans in Middlesex, Massachusetts range from $0.00/mo to $325.00/mo (CY2026)** — RECORDED · CMS CY2026 Medicare Landscape Files (https://www.cms.gov/medicare/health-drug-plans/medicare-advantage/plan-information/plan-information)
- **CMS assigned star ratings to 38 of 49 Medicare plans in Middlesex, Massachusetts (CY2026); average overall: 4.0 stars** — PROJECTED · CMS CY2026 Medicare Landscape Files (https://www.cms.gov/medicare/health-drug-plans/medicare-advantage/plan-information/plan-information)
- **What these Medicare plan figures are — and are NOT — for Middlesex, Massachusetts (the epistemic boundary)** — INTERPRETATION · Coverage Atlas framing (over the CMS facts above) (https://coverage-atlas.ryanjhunter.workers.dev/coverage/medicare-plans/ma/middlesex)

Do not take these on trust — re-fetch each named source. Full structured object: `https://coverage-atlas.ryanjhunter.workers.dev/coverage/medicare-plans/ma/middlesex.jsonld` · anatomy of the research object: see /commons/the-research-object

**Medicare plans in Middlesex, Massachusetts (CY2026) — all RECORDED/DETERMINATION** (49): H0777_001 — Mass General Brigham SCO (HMO D-SNP) — SNP — HMO D-SNP — Mass General Brigham Health Plan — 35.8 — Not rated — 9250 — No; H1280_001 — eternalHealth Forever (HMO) — MA-PD — HMO — eternalHealth — 0 — Not rated — 5000 — No; H1486_001 — CCA One Care (HMO D-SNP) — SNP — HMO D-SNP — Commonwealth Care Alliance, Inc. — 25 — Not rated — 8845 — No…