# Atlas Commons research objects — Medicare Advantage organization directory entry for Mass General Brigham Health Plan (contract H9485) — context brief

CMS Medicare Advantage Plan Directory entry for Mass General Brigham Health Plan (contract H9485): organization identity (type, plan type, parent, CMS region), enrollment, and directory contact — all verbatim CMS-published values (RECORDED). Epistemic status of each figure is labeled. This is an organizational directory — not plan benefits, premiums, or star ratings; use medicare.gov/plan-compare to compare actual plans. CC0.

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

- **Mass General Brigham Health Plan (contract H9485) is a CMS-contracted Local CCP offering Local PPO plans** — RECORDED · CMS Medicare Advantage Plan Directory (https://www.cms.gov/medicare/health-drug-plans/medicare-advantage)
- **Mass General Brigham Health Plan (contract H9485) has 17,823 reported CMS enrollment** — RECORDED · CMS Medicare Advantage Plan Directory (https://www.cms.gov/medicare/health-drug-plans/medicare-advantage)
- **CMS MA Plan Directory contact for Mass General Brigham Health Plan (contract H9485)** — RECORDED · CMS Medicare Advantage Plan Directory (https://www.cms.gov/medicare/health-drug-plans/medicare-advantage)
- **What this Medicare Advantage directory entry is — and is NOT — for Mass General Brigham Health Plan (the epistemic boundary)** — INTERPRETATION · Coverage Atlas framing (over the CMS MA Plan Directory facts above) (https://coverage-atlas.ryanjhunter.workers.dev/coverage/medicare-advantage/h9485)

Do not take these on trust — re-fetch each named source. Full structured object: `https://coverage-atlas.ryanjhunter.workers.dev/coverage/medicare-advantage/h9485.jsonld` · anatomy of the research object: see /commons/the-research-object

**Mass General Brigham Health Plan (H9485) — CMS MA Plan Directory identity (all RECORDED)** (11): Contract number — H9485 — RECORDED — CMS Medicare Advantage Plan Directory; Legal entity name — Mass General Brigham Health Plan, Inc. — RECORDED — CMS Medicare Advantage Plan Directory; Organization marketing name — Mass General Brigham Health Plan — RECORDED — CMS Medicare Advantage Plan Directory…
**Mass General Brigham Health Plan (H9485) — CMS MA Plan Directory contact (all RECORDED)** (6): Contact name — Chris Miller — RECORDED — CMS Medicare Advantage Plan Directory; Contact title — Director, Customer Engage — RECORDED — CMS Medicare Advantage Plan Directory; Contact phone — 1-857-282-3360 — RECORDED — CMS Medicare Advantage Plan Directory…