621999 All Other Miscellaneous Ambulatory Health Care Services

Official definition

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).

Examples Census gives

• 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)
• Smoking cessation programs
• Pacemaker monitoring services

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:

• Establishments primarily engaged in the independent practice of medicine are classified in Industry 62111, Offices of Physicians.
• Establishments primarily engaged in the independent practice of dentistry are classified in Industry 621210, Offices of Dentists.
• Establishments primarily engaged in the independent practice of health care (except offices of physicians and dentists) are classified in Industry Group 6213, Offices of Other Health Practitioners.
• Establishments primarily engaged in providing general or specialized outpatient care services are classified in Industry Group 6214, Outpatient Care Centers.
• Establishments primarily engaged in providing home health care services are classified in Industry 621610, Home Health Care Services.
• Establishments primarily engaged in the transportation of patients by ground or air, along with medical care, are classified in Industry 621910, Ambulance Services.
• Establishments known as medical and diagnostic laboratories primarily engaged in providing analytic or diagnostic services are classified in Industry 62151, Medical and Diagnostic Laboratories.
• Blood and organ banks are classified in U.S. Industry 621991, Blood and Organ Banks.

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

Activities listed under 621999

The Census index assigns these 12 activities to this code. If your business matches one, this is your code.

• Blood pressure screening facilities
• Blood pressure screening services
• Employee drug testing services
• Head lice removal services (except by offices of health practitioners)
• Health screening services (except by offices of health practitioners)
• Hearing testing services (except by offices of audiologists)
• Medical care management services
• Medical case management services
• Pacemaker monitoring services
• Physical fitness evaluation services (except by offices of health practitioners)
• Smoking cessation programs
• Stop smoking clinics

Source: US Census Bureau, 2022 NAICS index file.

SBA size standard for 621999

To count as a small business for SBA loans and federal contracts under NAICS 621999, your business (including affiliates) must not exceed $20.5 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: 8690), so treat them as a starting point and check the definition.

• 86900Other human health activitiesUK SIC

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

Similar codes to compare

• 621991Blood and Organ Banks