Industry Sector

Health Care and Social Assistance

Total Companies


Est. Employment



This U.S. industry comprises establishments with physicians and other medical staff primarily engaged in providing a range of outpatient medical services to the health maintenance organization (HMO) subscribers with a focus generally on primary health care. These establishments are owned by the HMO. Included in this industry are HMO establishments that both provide health care services and underwrite health and medical insurance policies.


NAICS Code 621491 - HMO Medical Centers is a final level code of the “Health Care and Social Assistance” Sector. There are 517 companies classified in this industry in the USA with an estimated employment of 35,185 people.

Industry Examples

Common types of examples within NAICS Code 621491 - HMO Medical Centers are:

  • Group hospitalization plans providing health care services
  • Health maintenance organization (HMO) medical centers and clinics
  • HMO (health maintenance organization) medical centers and clinics


For some business types, there may be a similar industry to NAICS Code 621491 - HMO Medical Centers that is a better classification match. Establishments primarily engaged in:

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