# Part D plan service area (geographic locator), monthly (CMS)

`drug_silver.fact_part_d_plan_service_area_monthly` · Drugs and formularies · status live · 7,581,448 rows

For every local MA-PD plan segment, the states and SSA counties it serves, in every monthly edition 2019-01..2026-09. 2026-09: 111,899 rows, 5,123 plan segments, 3,155 counties.

**Grain.** One row per (release_month, contract_id, plan_id, segment_id, state, county_code).

| column | type | meaning |
|---|---|---|
| contract_id | string |  |
| plan_id | string |  |
| segment_id | string |  |
| state | string |  |
| county_code | string |  |
| release_month | string |  |
| contract_year | int |  |
| 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 |  |
| source_id | string |  |
| is_current | boolean |  |
| bronze_object_key | string |  |
| s3_version_id | string |  |
| vintage_tag | string |  |
| drug_source_version_id | string |  |

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