NAICS 621111:
Offices of Physicians (except Mental Health Specialists)
This U.S. industry comprises establishments of health practitioners having the degree of M.D. (Doctor of Medicine) or D.O. (Doctor of Osteopathic Medicine) primarily engaged in the independent practice of general or specialized medicine (except psychiatry or psychoanalysis) or surgery. These practitioners operate private or group practices in their own offices (e.g., centers, clinics) or in the facilities of others, such as hospitals or HMO medical centers.
Forensic pathologists' officesHealth screening services in physicians' offices
Matching SIC code: 8031 Offices and Clinics of Doctors of Osteopathy (also 8011 Offices and Clinics of Doctors of Medicine)
Where it sits
- 62Health Care and Social AssistanceSector
- 621Ambulatory Health Care ServicesSubsector
- 6211Offices of PhysiciansIndustry group
- 62111Offices of PhysiciansNAICS industry
- 621111Offices of Physicians (except Mental Health Specialists)National industry
Largest companies with NAICS 621111
Updated Nov 9, 2026| Rank | Company | Headquarters | Employees |
|---|---|---|---|
| 1 |  TeamHealthteamhealth.com | Knoxville, US | 9K |
| 2 |  US Acute Care Solutionsusacs.com | Canton, US | 5.4K |
| 3 |  Oak Street Health, part of CVS Healthoakstreethealth.com | Chicago, US | 5.3K |
| 4 |  Pediatrix Medical Grouppediatrix.com | Fort Lauderdale, US | 5.1K |
| 5 |  WellMed Medical Managementwellmedhealthcare.com | San Antonio, US | 4.5K |
| 6 |  Sutter Health - Palo Alto Medical Foundationsutterhealth.org | Mountain View, US | 4.5K |
| 7 |  Vituityvituity.com | Emeryville, US | 4.4K |
| 8 |  Texas Oncologytexasoncology.com | Dallas, US | 4.2K |
| 9 |  Kelsey-Seybold Clinickelsey-seybold.com | Pearland, US | 4.1K |
| 10 |  SCP Healthscphealth.com | Atlanta, US | 4.1K |
Not this code?
Similar activities the Census classifies elsewhere.
- 621493Freestanding Ambulatory Surgical and Emergency CentersFreestanding medical centers primarily engaged in providing emergency medical care for accident or trauma victims and freestanding ambulatory surgical centers primarily engaged in providing surgery on an outpatient basis
- 621491HMO Medical CentersHealth maintenance organization (HMO) medical centers
- 621498All Other Outpatient Care CentersOutpatient community health clinics with health practitioners from multiple industries
Questions about NAICS 621111
Which businesses use NAICS 621111?
What SIC code matches NAICS 621111?
How many companies have NAICS 621111?
Code titles, definitions, examples and SIC matches: NAICS 2022 and the Census concordances, US Census Bureau. Company counts and lists: Crustdata, companies with a website, each by its primary code, updated weekly. Employee counts are estimates.