NAICS 621999:
All Other Miscellaneous Ambulatory Health Care Services
This U.S. industry comprises establishments primarily engaged in providing ambulatory health care services (except offices of physicians, dentists, and other health practitioners; outpatient care centers; medical and diagnostic laboratories; home health care providers; ambulances; and blood and organ banks).
Health screening services (except by offices of health practitioners)Physical fitness evaluation services (except by offices of health practitioners)Hearing testing services (except by offices of audiologists)+2 examples
Smoking cessation programsPacemaker monitoring services
Matching SIC code: 8099 Health and Allied Services, Not Elsewhere Classified
Where it sits
- 62Health Care and Social AssistanceSector
- 621Ambulatory Health Care ServicesSubsector
- 6219Other Ambulatory Health Care ServicesIndustry group
- 62199All Other Ambulatory Health Care ServicesNAICS industry
- 621999All Other Miscellaneous Ambulatory Health Care ServicesNational industry
Largest companies with NAICS 621999
Updated Nov 9, 2026| Rank | Company | Headquarters | Employees |
|---|---|---|---|
| 1 |  Signify Healthsignifyhealth.com | Dallas, US | 3.9K |
| 2 |  hims & hershims.com | San Francisco, US | 2.1K |
| 3 |  Matrix Medical Networkmatrixmedicalnetwork.com | Nashville, US | 1.8K |
| 4 |  Included Healthincludedhealth.com | San Francisco, US | 1.7K |
| 5 |  SpecialtyCarespecialtycareus.com | Brentwood, US | 1.7K |
| 6 |  Healthwayshealthways.com | Franklin, US | 1.5K |
| 7 |  Solacesolace.health | Redwood City, US | 1.5K |
| 8 |  Advantmedadvantmed.com | Irvine, US | 1.3K |
| 9 |  EMSIemsinet.com | Irving, US | 1.1K |
| 10 |  VitalCore Health Strategiesvitalcorehs.com | Topeka, US | 1.1K |
Not this code?
Similar activities the Census classifies elsewhere.
- 62111Offices of PhysiciansEstablishments primarily engaged in the independent practice of medicine
- 621210Offices of DentistsEstablishments primarily engaged in the independent practice of dentistry
- 6213Offices of Other Health PractitionersEstablishments primarily engaged in the independent practice of health care (except offices of physicians and dentists)
- 6214Outpatient Care CentersEstablishments primarily engaged in providing general or specialized outpatient care services
Questions about NAICS 621999
Which businesses use NAICS 621999?
Health screening services (except by offices of health practitioners), physical fitness evaluation services (except by offices of health practitioners) and hearing testing services (except by offices of audiologists), and similar businesses in the Health Care and Social Assistance sector. This U.S.
What SIC code matches NAICS 621999?
SIC 8099, Health and Allied Services, Not Elsewhere Classified, from the US Census Bureau's concordance between the two systems.
How many companies have NAICS 621999?
9,196 companies with a website carry NAICS 621999 as their primary code in Crustdata's data, worldwide.
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Sign up freeCode 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.