{
 "id": "cms:9767cb68-8ea9-4f0b-8179-9431abc89f11",
 "slug": "accountable-care-organization-participants",
 "source": "data.cms.gov",
 "title": "Accountable Care Organization Participants",
 "summary": "Participants in Medicare Shared Savings Program ACOs, with name, track, years in the program and key contacts.",
 "description": "The Accountable Care Organization (ACO) Participants data presents overview information on ACO participants in the Medicare Shared Savings Program (Shared Savings Program), including their name, track status, number of years in the program, and contact information of key personnel.",
 "aliases": [
  "ACO participants",
  "MSSP participants",
  "shared savings program"
 ],
 "keywords": [
  "Medicare",
  "Value-Based Care",
  "Coordinated Care",
  "Payment Models",
  "Accountable Care Organizations"
 ],
 "themes": [
  "Medicare"
 ],
 "topics": [
  "aco-value-based",
  "spending-utilization",
  "quality"
 ],
 "category": "medicare-shared-savings-program",
 "publisher": "Office of Enterprise Data and Analytics (OEDA)",
 "contact": "SharedSavingsProgram@cms.hhs.gov",
 "landing_url": "https://data.cms.gov/medicare-shared-savings-program/accountable-care-organization-participants",
 "csv_url": "https://data.cms.gov/sites/default/files/2026-01/453bc69c-61a4-4030-8d03-e33895fd1cfd/PY2026_Medicare_Shared_Savings_Program_Participants.csv",
 "api_url": "https://data.cms.gov/data-api/v1/dataset/9767cb68-8ea9-4f0b-8179-9431abc89f11/data",
 "api_kind": "cms-data-api",
 "preview_url": "https://data.cms.gov/data-api/v1/dataset/9767cb68-8ea9-4f0b-8179-9431abc89f11/data?size=10",
 "dictionary_url": "https://data.cms.gov/resources/aco-participants-data-dictionary",
 "dictionary_kind": "page",
 "methodology_urls": [
  "https://data.cms.gov/resources/acos-aco-participants-and-snf-affiliates-methodology"
 ],
 "state_column": "ACO_Service_Area",
 "row_count": 15370,
 "posted": "2026-02-04",
 "modified": "2026-02-04",
 "period_start": "2014-01-01",
 "period_end": "2026-12-31",
 "latest_period": "2026-01-01 to 2026-12-31",
 "cadence": "annually",
 "next_update": null,
 "versions": [
  {
   "label": "2026-01-01",
   "uuid": "9767cb68-8ea9-4f0b-8179-9431abc89f11",
   "posted": "2026-02-04",
   "period_start": "2026-01-01",
   "period_end": "2026-12-31"
  },
  {
   "label": "2025-02-01",
   "uuid": "5be87981-41ad-41bc-964e-af5cbf22d5af",
   "posted": "2025-09-10",
   "period_start": "2025-01-01",
   "period_end": "2025-12-31"
  },
  {
   "label": "2024-01-24",
   "uuid": "42b86f46-d8be-4e6d-bd03-b0b32dafe2d5",
   "posted": "2024-01-29",
   "period_start": "2024-01-01",
   "period_end": "2024-12-31"
  },
  {
   "label": "2023-01-13",
   "uuid": "fd907586-71e8-4128-ad95-801ee1f4f6f0",
   "posted": "2023-03-06",
   "period_start": "2023-01-01",
   "period_end": "2023-12-31"
  },
  {
   "label": "2022-01-01",
   "uuid": "5b678653-aa36-455b-9144-1d073ef7991b",
   "posted": "2022-01-26",
   "period_start": "2022-01-01",
   "period_end": "2022-12-31"
  },
  {
   "label": "2021-01-11",
   "uuid": "7b409bba-ca00-426e-9493-1dc10e5340cc",
   "posted": "2022-01-27",
   "period_start": "2021-01-01",
   "period_end": "2021-12-31"
  },
  {
   "label": "2020-01-15",
   "uuid": "3870b29c-4312-4fb1-a956-71c148ae5b50",
   "posted": "2022-01-27",
   "period_start": "2020-01-01",
   "period_end": "2020-12-31"
  },
  {
   "label": "2019-07-31oc1",
   "uuid": "2c209bdb-ed0c-42e0-b027-8a97024b8035",
   "posted": "2024-01-29",
   "period_start": "2019-01-01",
   "period_end": "2019-12-31"
  },
  {
   "label": "2019-01-01",
   "uuid": "017e6ab7-7e19-4e98-b4fa-30578b47e578",
   "posted": "2022-01-27",
   "period_start": "2019-01-01",
   "period_end": "2019-12-31"
  },
  {
   "label": "2018-01-01",
   "uuid": "6ed410fb-5e7d-477f-90ed-a499e951c5d1",
   "posted": "2022-01-27",
   "period_start": "2018-01-01",
   "period_end": "2018-12-31"
  },
  {
   "label": "2017-01-01",
   "uuid": "bbde17e0-01b1-46d2-b8bf-9949da11a448",
   "posted": "2022-01-27",
   "period_start": "2017-01-01",
   "period_end": "2017-12-31"
  },
  {
   "label": "2016-12-31",
   "uuid": "d2b525f5-77b6-416e-858c-36c9c381eb33",
   "posted": "2022-01-27",
   "period_start": "2016-01-01",
   "period_end": "2016-12-31"
  },
  {
   "label": "2015-12-31",
   "uuid": "4a743510-fbc3-4363-aab5-9d6c0fe3dea7",
   "posted": "2022-01-27",
   "period_start": "2015-01-01",
   "period_end": "2015-12-31"
  },
  {
   "label": "2014-12-31",
   "uuid": "5ebc6246-1861-4d9f-92b4-33c69b315d64",
   "posted": "2022-01-27",
   "period_start": "2014-01-01",
   "period_end": "2014-12-31"
  }
 ],
 "columns": [
  {
   "name": "ACO_ID",
   "label": "ACO Identifier",
   "type": "string",
   "meaning": "ACO Identifier. Identifier is unique for each ACO",
   "source": "cms-dictionary"
  },
  {
   "name": "Par_LBN",
   "label": "Participant Legal Business Name",
   "type": "string",
   "meaning": "Legal Business Name of ACO Participant",
   "source": "cms-dictionary"
  },
  {
   "name": "ACO_Name",
   "label": "ACO Name",
   "type": "string",
   "meaning": "When available, ACO's Doing Business As (DBA) Name. If not available, ACO's Legal Business Name (LBN)",
   "source": "cms-dictionary"
  },
  {
   "name": "ACO_Service_Area",
   "label": "State(s) where assigned beneficiaries reside",
   "type": "string",
   "meaning": "State(s) with counties where greater than 1% of assigned beneficiaries reside",
   "source": "cms-dictionary"
  },
  {
   "name": "Agreement_Period_Num",
   "label": "Agreement Period Number",
   "type": "number",
   "meaning": "Agreement period number this ACO is currently participating in",
   "source": "cms-dictionary"
  },
  {
   "name": "Initial_Start_Date",
   "label": "Initial Agreement Start Date",
   "type": "date",
   "meaning": "Agreement start date (for initial agreement period)",
   "source": "cms-dictionary"
  },
  {
   "name": "Current_Start_Date",
   "label": "Current Start Date",
   "type": "date",
   "meaning": "Agreement renewal date (for ACOs who have successfully renewed for a second or subsequent agreement period)",
   "source": "cms-dictionary"
  },
  {
   "name": "Re-entering_ACO",
   "label": "Re-entering ACO",
   "type": "number",
   "meaning": "0/1 flag; =1 if re-entering ACO; otherwise 0",
   "source": "cms-dictionary"
  },
  {
   "name": "BASIC_Track",
   "label": "BASIC_Track",
   "type": "number",
   "meaning": "0/1 flag; =1 if ACO selected BASIC track; otherwise 0",
   "source": "cms-dictionary"
  },
  {
   "name": "BASIC_Track_Level",
   "label": "BASIC_Track_Level",
   "type": "string",
   "meaning": "BASIC track levels (A, B, C, D, or E) if BASIC_Track is equal to 1; otherwise N/A",
   "source": "cms-dictionary"
  },
  {
   "name": "ENHANCED_Track",
   "label": "ENHANCED_Track",
   "type": "number",
   "meaning": "0/1 flag; =1 if ACO selected ENHANCED track; otherwise 0. Track 3 was renamed the ENHANCED track and is accounted for under this variable",
   "source": "cms-dictionary"
  },
  {
   "name": "High_Revenue_ACO",
   "label": "High_Revenue_ACO",
   "type": "number",
   "meaning": "0/1 flag; =1 if ACO is classified as a high revenue ACO; otherwise 0",
   "source": "cms-dictionary"
  },
  {
   "name": "Low_Revenue_ACO",
   "label": "Low_Revenue_ACO",
   "type": "number",
   "meaning": "0/1 flag; =1 if ACO is classified as a low revenue ACO; otherwise 0",
   "source": "cms-dictionary"
  },
  {
   "name": "Adv_Pay",
   "label": "Advance Pay",
   "type": "number",
   "meaning": "0/1 flag; =1 if ACO selected to participate in the Advance Pay program; otherwise 0",
   "source": "cms-dictionary"
  },
  {
   "name": "AIM",
   "label": "ACO Investment Model",
   "type": "number",
   "meaning": "0/1 flag; =1 if ACO selected to participate in AIM; otherwise 0",
   "source": "cms-dictionary"
  },
  {
   "name": "AIP",
   "label": "Advance Investment Payments",
   "type": "number",
   "meaning": "0/1 flag; =1 if ACO selected to participate in AIP; otherwise 0",
   "source": "cms-dictionary"
  },
  {
   "name": "PSS",
   "label": "Prepaid Shared Savings",
   "type": "number",
   "meaning": "0/1 flag; =1 if ACO selected to participate in PSS; otherwise 0",
   "source": "cms-dictionary"
  },
  {
   "name": "SNF_3-Day_Rule_Waiver",
   "label": "Skilled Nursing Facility 3-Day Rule Waiver",
   "type": "number",
   "meaning": "0/1 flag; =1 if ACO was approved for SNF 3-Day Rule Waiver; otherwise 0",
   "source": "cms-dictionary"
  },
  {
   "name": "Prospective_Assignment",
   "label": "Prospective Assignment",
   "type": "number",
   "meaning": "0/1 flag; =1 if prospective beneficiary assignment methodology; otherwise 0",
   "source": "cms-dictionary"
  },
  {
   "name": "Retrospective_Assignment",
   "label": "Retrospective Assignment",
   "type": "number",
   "meaning": "0/1 flag; =1 if preliminary prospective with retrospective reconciliation beneficiary assignment methodology; otherwise 0",
   "source": "cms-dictionary"
  },
  {
   "name": "ACO_Address",
   "label": "ACO Address",
   "type": "string",
   "meaning": "ACO Address",
   "source": "cms-dictionary"
  },
  {
   "name": "ACO_Public_Reporting_Website",
   "label": "ACO Public Reporting Website",
   "type": "string",
   "meaning": "ACO Public Reporting Website",
   "source": "cms-dictionary"
  },
  {
   "name": "ACO_Exec_Name",
   "label": "ACO Executive Name",
   "type": "string",
   "meaning": "ACO Executive Name",
   "source": "cms-dictionary"
  },
  {
   "name": "ACO_Exec_Email",
   "label": "ACO Executive Email",
   "type": "string",
   "meaning": "ACO Executive Email",
   "source": "cms-dictionary"
  },
  {
   "name": "ACO_Exec_Phone",
   "label": "ACO Executive Phone",
   "type": "number",
   "meaning": "ACO Executive Phone",
   "source": "cms-dictionary"
  },
  {
   "name": "ACO_Public_Name",
   "label": "ACO Public Reporting Contact Name",
   "type": "string",
   "meaning": "ACO Public Reporting Contact Name",
   "source": "cms-dictionary"
  },
  {
   "name": "ACO_Public_Email",
   "label": "ACO Public Reporting Contact Email",
   "type": "string",
   "meaning": "ACO Public Reporting Contact Email",
   "source": "cms-dictionary"
  },
  {
   "name": "ACO_Public_Phone",
   "label": "ACO Public Reporting Contact Phone",
   "type": "number",
   "meaning": "ACO Public Reporting Contact Phone",
   "source": "cms-dictionary"
  },
  {
   "name": "ACO_Compliance_Contact_Name",
   "label": "ACO Compliance Contact Name",
   "type": "string",
   "meaning": "ACO Compliance Contact Name",
   "source": "cms-dictionary"
  },
  {
   "name": "ACO_Medical_Director_Name",
   "label": "ACO Medical Director Name",
   "type": "string",
   "meaning": "ACO Medical Director Name",
   "source": "cms-dictionary"
  },
  {
   "name": "pc_flex_agreement_status",
   "label": null,
   "type": "number",
   "meaning": null,
   "source": "cms-api"
  }
 ],
 "caveats": [],
 "curated": true,
 "license": "https://www.usa.gov/government-works",
 "detail_key": "9767cb68-8ea9-4f0b-8179-9431abc89f11|2026-02-04",
 "checked": "2026-10-25",
 "source_name": "data.cms.gov"
}