621491 HMO Medical Centers

Official definition

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.

Source: US Census Bureau, 2022 NAICS descriptions.

When to use a different code

Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:

• Health practitioners or health practitioner groups contracting to provide their services to subscribers of pre-paid health plans are classified in Industry 62111, Offices of Physicians; Industry 621210, Offices of Dentists; and Industry Group 6213, Offices of Other Health Practitioners.
• HMO establishments (except those providing health care services) primarily engaged in underwriting and administering health and medical insurance policies are classified in U.S. Industry 524114, Direct Health and Medical Insurance Carriers.

Source: US Census Bureau, 2022 NAICS cross-references.

Activities listed under 621491

The Census index assigns these 3 activities to this code. If your business matches one, this is your code.

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

Source: US Census Bureau, 2022 NAICS index file.

SBA size standard for 621491

To count as a small business for SBA loans and federal contracts under NAICS 621491, your business (including affiliates) must not exceed $44.5 million in average annual receipts. Check your business.

Source: SBA table of size standards, effective March 17, 2023.

Closest UK SIC 2007 codes

There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 8620), so treat them as a starting point and check the definition.

• 86210General medical practice activitiesUK SIC
• 86220Specialists medical practice activitiesUK SIC
• 86230Dental practice activitiesUK SIC

Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.

Similar codes to compare

• 621492Kidney Dialysis Centers
• 621493Freestanding Ambulatory Surgical and Emergency Centers
• 621498All Other Outpatient Care Centers