Number of Accountable Care Organization Assigned Beneficiaries by County

The Shared Savings Program Number of Accountable Care Organization Assigned Beneficiaries by County dataset provides aggregate data of total assigned…

Part of the CMS Data Feeds Dataset › Medicare

Dataplex delivers this CMS feed as the analysis-ready table DWV.NUMBER_OF_ACCOUNTABLE_CARE_ORGANIZATION_ASSIGNED_BENEFICIARIES_BY_COUNTY on Snowflake and Databricks — eight snapshot releases spanning 2021–2024, aligned to a single schema, refreshed automatically whenever CMS publishes a new file. Every row carries lineage back to the exact CMS source file that produced it.

Key facts

Snowflake	DWV.NUMBER_OF_ACCOUNTABLE_CARE_ORGANIZATION_ASSIGNED_BENEFICIARIES_BY_COUNTY
Databricks	cms_dwv.number_of_accountable_care_organization_assigned_beneficiaries_by_county
Coverage	Jan 2021 – Dec 2024
Cadence	Annual
Update pattern	Full-refresh — each file replaces the prior snapshot
CMS published	2025-11-17
Loaded	2025-11-17
Columns	12 data + 6 lineage
Identifiers	State & county FIPS codes · ACO ID
File versions	8
License	CMS public data — U.S. Government work
Platforms	Snowflake Marketplace · Databricks Delta Sharing

Included in the CMS Data Feeds Dataset — start a free trial on Snowflake Marketplace.

Current — CMS last published this feed on 2025-11-17. Coverage runs through 2024-12-31. Next CMS release expected ~Nov 2026.

Full-refresh feed — each file version is a complete snapshot and newer files supersede older ones. Filter to the latest file (see the sample query) to avoid double-counting across versions.

Sample queries

Snowflake

-- Latest snapshot only (avoids double-counting across file versions)
SELECT *
FROM DWV.NUMBER_OF_ACCOUNTABLE_CARE_ORGANIZATION_ASSIGNED_BENEFICIARIES_BY_COUNTY
WHERE FILE_ID IN (
  SELECT ID FROM DWV.FEEDS_FILES WHERE IS_LATEST = 1
)
LIMIT 100;

Databricks

About this feed

The Shared Savings Program Number of Accountable Care Organization Assigned Beneficiaries by County dataset provides aggregate data of total assigned beneficiaries by Shared Savings Program ACO for each county where at least one of their assigned beneficiaries resides. Assigned beneficiary person-year counts are based on certified Shared Savings Program ACO Participant Lists and assignment methodology for that performance year.

— Source: CMS feed metadata

Keywords: Medicare, Original Medicare, Value-Based Care, Coordinated Care, Payment Models, Accountable Care Organizations Theme: Medicare

Coverage timeline

2021 🟩 · 2022 🟩 · 2023 🟩 · 2024 🟩

4 of 4 years with snapshot releases — no gaps.

Release history

Reporting period	CMS published	Loaded	Latest file
Snapshot as of 2025-11-17	2025-11-17	2025-11-17	✓
Snapshot as of 2025-11-05	2025-11-05	2025-11-05
Snapshot as of 2025-09-11	2025-09-11	2025-10-18
Snapshot as of 2024-11-21	2024-11-21	2024-11-21
Snapshot as of 2024-01-23	2024-01-23	2024-01-23
Snapshot as of 2022-09-20	2022-09-20	2024-01-23
Snapshot as of 2023-09-20	2023-09-20	2023-09-20
Snapshot as of 2022-09-20	2022-09-20	2023-08-29

Data dictionary

📋 12 data columns + 6 lineage columns

Column-level definitions are maintained by CMS in the official Number of Accountable Care Organization Assigned Beneficiaries by County data dictionary.

Data columns

Column	Type
YEAR	NUMBER
ACO_ID	TEXT
STATE_NAME	TEXT
COUNTY_NAME	TEXT
STATE_ID	NUMBER
COUNTY_ID	NUMBER
AB_PSN_YRS_ESRD	NUMBER
AB_PSN_YRS_DIS	NUMBER
AB_PSN_YRS_AGDU	NUMBER
AB_PSN_YRS_AGND	NUMBER
TOT_AB_PSN_YRS	NUMBER
TOT_AB	NUMBER

Lineage columns (present on every feed table)

Column	Type	Description
ROW_ID	TEXT	Unique row ID for this table (PK)
FILE_ID	TEXT	Source file — joins to FEEDS_FILES.ID (FK)
FILE_FEED_ID	TEXT	Parent feed — joins to FEEDS.ID (FK)
FILE_NAME	TEXT	Source file name as published by CMS
ROWNUM	NUMBER	Row number within the source file
CREATED_AT	TIMESTAMP_NTZ	Timestamp when the record was loaded

Row-level lineage

Every row in this table traces to the exact CMS source file that produced it. The FILE_ID column joins to the FEEDS_FILES catalog table, and FILE_FEED_ID joins to the FEEDS master table:

Trace any row back to its source file and reporting period:

SELECT d.YEAR, d.ACO_ID, d.STATE_NAME,
       ff.TEMPORAL_START, ff.TEMPORAL_END, ff.CMS_FEED_MODIFIED
FROM DWV.NUMBER_OF_ACCOUNTABLE_CARE_ORGANIZATION_ASSIGNED_BENEFICIARIES_BY_COUNTY d
JOIN DWV.FEEDS_FILES ff ON d.FILE_ID = ff.ID;

Source & provenance

Published by the Centers for Medicare & Medicaid Services (bureau 009:38).

• Official CMS data dictionary

• Number of Accountable Care Organization Assigned Beneficiaries by County Methodology

Frequently asked questions

How often is Number of Accountable Care Organization Assigned Beneficiaries by County updated?

Annually. CMS last published this feed on 2025-11-17, and Dataplex loaded it to the warehouse the same day. New releases are added automatically when CMS publishes them.

What years does Number of Accountable Care Organization Assigned Beneficiaries by County cover?

2021 through 2024.

How many records are in Number of Accountable Care Organization Assigned Beneficiaries by County?

Count the current snapshot yourself once the share is mounted:

SELECT COUNT(*)
FROM DWV.NUMBER_OF_ACCOUNTABLE_CARE_ORGANIZATION_ASSIGNED_BENEFICIARIES_BY_COUNTY d
JOIN DWV.FEEDS_FILES ff ON d.FILE_ID = ff.ID
WHERE ff.IS_LATEST = 1;

How do I get Number of Accountable Care Organization Assigned Beneficiaries by County data?

It's included in the CMS Data Feeds Dataset on the Snowflake Marketplace (free trial available) and via Databricks Delta Sharing. Once mounted, query DWV.NUMBER_OF_ACCOUNTABLE_CARE_ORGANIZATION_ASSIGNED_BENEFICIARIES_BY_COUNTY directly — no pipeline setup required.

Related feeds

Advance Investment Payment Spend PlanACO Realizing Equity, Access and Community Health Eligible BeneficiariesREACH ACOsCounty-level Aggregate Expenditure and Risk Score Data on Assignable BeneficiariesACO Realizing Equity, Access and Community Health Aligned Beneficiaries

Get this feed

1. Start a free trial on Snowflake Marketplace or purchase via Databricks

2. Mount the share — the database and DWV schema appear in your account immediately

3. Run the sample query above — no ETL, no pipeline maintenance

Questions about this feed? Contact us at [e-mail].

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