# CMS Accountable Care Organization (ACO) Participants — Shared Savings Program

`medicare_silver.fact_aco_participant` · Medicare Advantage, Part D, Medicaid · status live · 183,710 rows

The CMS Medicare Shared Savings Program ACO Participants list per ACO and participating organization: ACO id/name, service area, agreement period, track, revenue class, assignment type, and address. Production holds 2016-2026. Official 2014-2015 files are ID-less and owner-deferred; 2013 was not recovered.

**Grain.** One source row per (performance_year, ACO, participant legal business name); participant TIN is not retained, so this nominal key is not unique.

| column | type | meaning |
|---|---|---|
| performance_year | int |  |
| aco_id | string |  |
| participant_lbn | string |  |
| aco_name | string |  |
| aco_service_area | string |  |
| agreement_period_num | string |  |
| initial_start_date | string |  |
| current_start_date | string |  |
| basic_track | string |  |
| basic_track_level | string |  |
| enhanced_track | string |  |
| high_revenue_aco | string |  |
| low_revenue_aco | string |  |
| prospective_assignment | string |  |
| retrospective_assignment | string |  |
| aco_address | 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 |  |
| 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 medicare_silver.fact_aco_participant WHERE ... LIMIT 100`; read `describe_data_source("medicare_silver.fact_aco_participant")` first.