data.cms.gov

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 beneficiaries by Shared Savings Program ACO for each county where at...

Freshness

Last posted
Period covered
Jan 1, 2024 to Dec 31, 2024
Update frequency
Annually

Dates as CMS lists them in its catalog.

Columns 12

ColumnWhat it meansType
YearYearCalendar year (CY) for which assigned beneficiaries are determined.number
ACO IDACO_IDUnencrypted ACO identifier. This identifier can be linked to the encrypted ACO identifier used for prior performance years (Refer to Notes).string
State nameState_Namestring
County nameCounty_Namestring
State IDState_IDSocial Security Administration (SSA) state code. This code should always include two numeric characters, though leading zeros may be dropped when opening the files in some programs (e.g. a value of “01” may appear as “1”).string
County IDCounty_IDSSA county code. This code should always include three numeric characters, though leading zeros may be dropped when opening the files in some programs (e.g. a value of “001” may appear as “1”).string
ESRD assigned beneficiary person yearsAB_Psn_Yrs_ESRDNumber of assigned beneficiaries with End-Stage Renal Disease (ESRD) enrollment type in the county in the report period, adjusted for the total number of months that each beneficiary was classified as ESRD.number
DISABLED assigned beneficiary person yearsAB_Psn_Yrs_DISNumber of assigned beneficiaries with DISABLED enrollment type in the county in the report period, adjusted for the total number of months that each beneficiary was classified as DISABLED.number
AGED/DUAL assigned beneficiary person yearsAB_Psn_Yrs_AGDUNumber of assigned beneficiaries with AGED/DUAL enrollment type in the county in the report period, adjusted for the total number of months that each beneficiary was classified as AGED/DUAL.number
AGED/NON-DUAL assigned beneficiary person yearsAB_Psn_Yrs_AGNDNumber of assigned beneficiaries with AGED/NON-DUAL enrollment type in the county in the report period, adjusted for the total number of months that each beneficiary was classified as AGED/NON-DUAL.number
Total assigned beneficiary person yearsTot_AB_Psn_YrsTotal number of assigned beneficiaries in the county in the report period, adjusted for the total number of months that each beneficiary was classified as one of the four enrollment types.number
Total assigned beneficiariesTot_ABTotal number of assigned beneficiaries in the county in the report period.number

At a glance

Catalog
data.cms.gov
Publisher
Office of Enterprise Data and Analytics (OEDA)
Rows
135,203
Columns
12
State column
State_Name
Topics
ACOs and payment models, Spending and use of services, Quality and ratings
Contact
SharedSavingsProgram@cms.hhs.gov

API

Free, no key needed. This request returns the first 10 rows as JSON:

https://data.cms.gov/data-api/v1/dataset/ae8c9418-acc9-4442-b217-33291448f6b8/data?size=10

To keep only one state, filter on the State_Name column.

Versions 10

The newest version is the one linked above. Older releases stay on the official site.

  • 2024-12-01posted Nov 17, 2025
  • 2023-01-01posted Nov 5, 2025
  • 2022-02-01posted Jan 23, 2024
  • 2021-01-31posted Sep 20, 2022
  • 2020-01-01posted Sep 12, 2022
  • 2019-07-01oc1posted Jan 23, 2024
  • 2019-01-31posted Nov 30, 2021
  • 2018-01-15posted Nov 30, 2021
Show 2 older versions
  • 2017-01-15posted Nov 30, 2021
  • 2016-01-15posted Nov 30, 2021

CMS's description

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.

Methodology and other documents from CMS:

The summary at the top is the first sentence of this description. Record id cms:ae8c9418-acc9-4442-b217-33291448f6b8. This record as JSON.

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