# MA enrollment — monthly contract summary

`medicare_silver.monthly_contract_enrollment_summary` · Medicare Advantage, Part D, Medicaid · status live · 198,917 rows

CMS "Monthly Enrollment by Contract" — member counts per MA/Part D contract per month (enrollment_count). The member-volume input for MA revenue (revenue ~= enrollment x county benchmark x risk x rebate share).

**Grain.** One row per (contract_id, report_month) — CMS Monthly Enrollment by Contract (member counts). CERTIFIED 2026-06-03.

| column | type | meaning |
|---|---|---|
| contract_id | string |  |
| report_month | date |  |
| organization_type | string |  |
| plan_type | string |  |
| organization_name_raw | string |  |
| organization_marketing_name_raw | string |  |
| parent_org_raw | string |  |
| contract_effective_date | date |  |
| offers_part_d | boolean |  |
| enrollment_count | int |  |
| enrollment_lower_bound | int |  |
| enrollment_upper_bound | int |  |
| enrollment_suppression_reason | string |  |
| ma_only_count | int |  |
| ma_only_lower_bound | int |  |
| ma_only_upper_bound | int |  |
| ma_only_suppression_reason | string |  |
| part_d_count | int |  |
| part_d_lower_bound | int |  |
| part_d_upper_bound | int |  |
| part_d_suppression_reason | string |  |
| observed_period | date |  |
| asserted_at | date |  |
| effective_period_start | date |  |
| effective_period_end | date |  |
| cms_vintage_sequence | int |  |
| parse_revision | int |  |
| parser_artifact_hash | string |  |
| source_url | string |  |
| sha256_content_hash | string |  |

Tools that read it: get_enrollment, get_stars_rollup, prove_ma_enrollment_trend

Query it: `query_substrate` with `SELECT ... FROM medicare_silver.monthly_contract_enrollment_summary WHERE ... LIMIT 100`; read `describe_data_source("medicare_silver.monthly_contract_enrollment_summary")` first.