CMS
Open Payments →Financial transfers from manufacturers to physicians and teaching hospitals.
Medicare Shared Savings Program ACO Participants
Medicare Shared Savings Program accountable care organization participants — ACO legal business names and participation by performance year. Source:
FHIR Organization · Sample record
What a record looks like in the API response.
{
"resourceType": "Organization",
"id": "mssp-aco-example",
"_source": "cms-mssp-aco",
"_methodology": "cms-mssp-aco/v1",
"name": "Example ACO Participant LLC",
"extension": [{ "url": "performanceYear", "valueInteger": 2025 }]
}Every record carries _source, _methodology, a snapshot date, and a confidence tier. All fourteen provenance fields survive export and API delivery.
curl -H "Authorization: Bearer $FONTEUM_KEY" \ "https://api.fonteum.com/fhir/r4/Organization?_source=cms-mssp-aco" \ | jq '._source, ._methodology, .meta.tag'
Dataset facts
| Field | Value |
|---|---|
| Agency | |
| Category | Provider performance |
| Records | |
| Temporal coverage | 2025 |
| Refresh cadence | Annual |
| Freshness SLA | Within 7 days of annual CMS release |
| Last synced | 2026-06-14Updated 2026-06-14 |
| FHIR resource | Organization |
| Methodology | cms-mssp-aco/v1 |
| Measured | ACO id, participant legal business name, and performance year per participant |
| Upstream source | data.cms.gov → |
Get access
How to reach this dataset.
API access is operator-approved during the pilot. Reviewed within one business day. No charge during the pilot period.
Related · Provider performance
CMS
QPP Individual Scores →Individual clinician performance scores from the Quality Payment Program.
CMS
PECOS Ordering & Referring →Medicare enrollment status for providers eligible to order and refer services.