Methodology
How the data is built
Public sources, joined facility by facility, with a source and a date on every fact.
Our mission
We are on a mission to map and tag the ever-changing landscape of healthcare providers in America. As with much of the healthcare system, there is no shortage of data; the hard part is sorting out what is practical and real for a specific use. We build from constant review of government-published data, public reporting by for-profit and nonprofit organizations, and our own verification on the web. We believe the result is the most robust downloadable resource connecting providers' real physical footprints to government data.
We will keep refining how existing providers are categorized and tagged, and add new provider verticals over time.
Tagging to date
71,391 open facilities across 6 provider types; 49,434 (69%) are tied to the operator or owner behind them. Updated 2026-10-27.
| Provider type | Facilities | Owner or operator tagged | Owner published with sources | Mapped to county |
|---|---|---|---|---|
| Hospitals | 6,667 | 6,394 96% | 6,160 92% | 5,462 82% |
| Hospital outpatient sites | 6,743 | 6,678 99% | 6,561 97% | 5,856 87% |
| Ambulatory surgery centers | 7,486 | 3,690 49% | 3,287 44% | 6,720 90% |
| Urgent care centers | 18,077 | 17,844 99% | 14,866 82% | 15,587 86% |
| Nursing homes | 14,921 | 14,821 99% | 14,795 99% | 13,308 89% |
| Behavioral health sites | 17,497 | 7 0% | 7 0% | 15,877 91% |
- ASCs tagged to their physician practice
- 2,725 36%
- ASCs tagged to an owner, a practice or both
- 4,958 66%
- ASCs with a principal specialty
- 5,597 75%
Ambulatory surgery centers
Surgery centers carry three tags. The owner, where public records or the company name one, published under the same rules as every other owner. The physician practice: from where Medicare clinicians practise, the group that accounts for at least 60% of the surgeons and proceduralists at the center's address. It says where the physicians work, not who owns the center, so it sits beside any owner (the physician side of a joint venture) and is never counted as ownership. And the principal specialty: the specialty at least half of those physicians share (ophthalmology, gastroenterology, orthopedics, pain and others), otherwise multi-specialty. Anesthesia and other staff who work at every surgery center are left out of both.
Sources
Facilities and their operators come from federal public records: CMS provider enrollment and certification files (including Nursing Home Care Compare and Medicare enrollment, PECOS), the NPPES National Provider Identifier registry, and the Census Bureau for geography. Nursing home ownership, including owners' percentages and chain affiliations, is as reported to CMS. Hospital and outpatient ownership is checked against SEC filings, IRS Form 990 filings and the companies' own published lists.
How ownership is linked
Each provider is tied to the organization that operates it, and each operator to the organizations above it, up to the ultimate owner. Where several sources disagree, the licensed or Medicare-enrolled operator takes precedence. Links are dated: a page shows when each fact was last confirmed, and changes are kept as history rather than overwritten.
When an owner is published
An ownership link appears on a page only when its evidence meets one of three tests: a public record names it (CMS, an SEC filing, an IRS Form 990, a state filing); the company itself discloses it on its own website or in a press release, and a second, independent kind of source agrees; or our own review of conflicting sources settled it. Trade press or encyclopedias alone are never enough, and a company page or filing that contradicts a link holds it back until it is reviewed. Each published owner lists its sources with links and dates.
Nursing home groups
Nursing home groups are CMS affiliated entities: homes that CMS links because they share owners or managers. Each home is counted once, in the group CMS lists on that home's own Medicare enrollment, and CMS names each group after one of its members. The operator shown on each home's page is the company or body enrolled with Medicare for that home.
We check group sizes against operators' own published counts. In October 2026, 39 of the 55 largest groups with a published count matched within about 15%. Most gaps came from recent acquisitions CMS had not yet recorded, or from counts that include assisted living.
In some states, notably Texas and Indiana, public bodies such as hospital districts and county hospitals hold the licences for many nursing homes and contract with a private company to run them. We tag these groups as public licensees; they are ranked like any other group.
What we will not do
- Guess an owner. If no source names one, the owner is shown as unknown.
- Merge two organizations on a similar name alone. Matches use identifiers, then exact names; anything looser is reviewed by a person.
- Publish data whose terms do not allow it.
Freshness
This edition of the data is dated 2026-10-27. Sources are re-checked on their own release schedules.
Corrections
Every provider page has a "Report a correction" link. You can also contact us directly.