Ask Claude about Medicare plan enrollment

Connect this server to Claude and ask questions in plain language about CMS Medicare Advantage and Part D enrollment. Claude queries the published CMS figures directly; it never estimates them.

https://mcp.revlucent.com/mcp

What you can do

Six ways to query the data

Ask naturally: Claude picks the right query for you. Behind the scenes it can:

Search plans Filter by organization, contract, plan type, Part D, or minimum enrollment.

Rank by size Highest-enrollment plans overall or within an organization type.

Look up one plan The full record for a specific contract and plan ID.

Summarize an organization Plan count and total known enrollment for a parent company.

Track a plan over time One plan's enrollment month by month across every loaded report.

Check coverage Which CMS report months are loaded, and when they were last refreshed.

Reference

Available tools

The exact MCP tools this server exposes, for anyone building against it directly rather than asking Claude in natural language.

Tool	Returns
`search_plans`	Plan-level records filtered by organization, contract, plan type, Part D, or minimum enrollment. Up to 100 rows.
`get_plan`	The full record for one contract and plan ID in a given report month.
`organization_summary`	Plan count and total known enrollment for a parent organization, rolling up subsidiaries.
`top_plans`	The highest-enrollment plans, optionally scoped to one organization type. Up to 100 rows.
`plan_history`	One plan's enrollment across every loaded report month, newest first. Up to 240 months.
`available_periods`	The CMS report months currently loaded into this server.

A read-only resource is also exposed at cms://datasets/monthly-enrollment-by-plan/schema, the full column dictionary and suppression semantics for the underlying CMS dataset.

Setup

Connect it to Claude

You'll need a Claude Pro, Max, Team, or Enterprise account, and a Google account to sign in with.

Open connector settings
In Claude, go to Settings → Connectors and choose Add custom connector.
Paste the server address
Use the URL at the top of this page. Any name works, but we suggest Revlucent.
Confirm the two detected settings
Claude inspects the server and pre-selects the right options. Keep them:
Authentication → Always required
OAuth client → No client ID, register one automatically
Leave additional request headers empty.
Sign in with Google
Click Connect. A Revlucent sign-in page opens; choose Continue with Google. You'll return to Claude marked as connected.
Turn it on in a chat
Open the tools menu in any conversation and enable the connector. You only sign in once; it stays connected for future chats.

Setup

Connect it to Claude Code

claude mcp add --transport http revlucent \
  https://mcp.revlucent.com/mcp

Then run /mcp in a session to sign in.

Try it

Questions that work well

Start here

What CMS enrollment data do you have loaded?

Find the largest plans

Show the 20 highest-enrollment Medicare plans in August 2026.

What are the biggest Local CCP plans right now?

Search with filters

Find Humana plans that offer Part D with at least 10,000 enrollees.

List UnitedHealthcare HMO plans, largest first.

Follow a plan across months

Show the enrollment history for contract H0028, plan 001.

How has Aetna's enrollment changed between August 2025 and August 2026?

Compare organizations

Summarize UnitedHealthcare's Medicare enrollment: how many plans and how many members?

Compare Humana and Aetna by plan count and total enrollment.

Look up a specific plan

Get plan H0016-003.

What's the enrollment for contract H0028, plan 001?

Reading the results

Suppressed enrollment is not zero

The one thing to understand

CMS withholds any enrollment count of 10 or fewer to protect beneficiary privacy, publishing an asterisk instead of a number.

This server reports those plans as suppressed rather than converting them to zero. A suppressed plan has members (somewhere between 1 and 10) and the exact figure simply isn't public.

That distinction carries into totals. When Claude sums enrollment for an organization, the total covers only plans with published figures, so it is a slight undercount rather than a precise total. Claude will say so when it matters.

Of the 7,604 plans in the newest report, 1,513 have suppressed enrollment (about one in five), so this comes up often. A plan can be suppressed in some months and published in others; Claude reports those months as suppressed rather than drawing a line through the gap.

Scope

What this data can't tell you

The server answers from the CMS reports it has loaded and declines questions beyond them rather than guessing. Ask what data is loaded to see the exact months available.

No geography. The plan-level report has no state or county column, so questions like "how many Medicare members in Texas?" can't be answered. That requires a separate CMS dataset.
Monthly snapshots only. Coverage runs from January 2023 to August 2026 (CMS never published July 2023). Comparisons are between published months; there is nothing between them and nothing after the newest.
No member-level data. Only published plan-level totals. Nothing about individual beneficiaries exists here.
No projections. Reported figures only; the server never models or forecasts.

If you ask something outside this scope, Claude will tell you the data isn't available instead of producing a plausible-sounding number.

Help

If something doesn't work

What you see	What to do
Google says access denied	Your account isn't approved for this server yet. Contact us to be added.
Claude can't reach the server	Check the address ends in `/mcp`. The base domain alone won't connect.
Connected, but no tools in chat	Enable the connector in that conversation's tools menu; it's off by default in new chats.
Asked to sign in again	Expected occasionally during this preview. Reconnect from Settings → Connectors.
Claude says it has no data for a question	Usually scope; see what this data can't tell you, above.

Preview service

This connector is in active development. Sign-ins may occasionally need to be repeated after a maintenance update, and the loaded months change as new CMS reports are published; ask what data is loaded if you need to be certain.