621999

All Other Miscellaneous Ambulatory Health Care Services

Health Care and Social Assistance › Ambulatory Health Care Services › Other Ambulatory Health Care Services

SBA Size Standard

$20.5M average annual receipts

Revenue-Based Verify at SBA.gov →

NAICS Code Hierarchy

62

Sector

Health Care and Social Assistance

621

Subsector

Ambulatory Health Care Services

6219

Industry Group

Other Ambulatory Health Care Services

621999

National Industry (This Code)

All Other Miscellaneous Ambulatory Health Care Services

Official NAICS Description

Source: U.S. Census Bureau 2022 NAICS

📘 Source: U.S. Census Bureau — 2022 NAICS Manual
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). Illustrative Examples: 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

✓ Small Business Eligibility at a Glance

Based on SBA Table of Small Business Size Standards (2024)

Size Standard

$20.5M average annual receipts

Measurement Period

3-year average

Standard Type

Revenue-Based

Applies To

All contracts under NAICS 621999

Set-Aside Programs

8(a), WOSB, HUBZone, SDVOSB

Certification Required

No (self-certify in SAM.gov)

Size standards are set by the SBA and reviewed periodically. Always verify at SBA.gov before bidding.

Cross-References

The following activities are classified elsewhere in the NAICS system:

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; and
Blood and organ banks are classified in U.S. Industry 621991, Blood and Organ Banks.

How to Use NAICS 621999 in SAM.gov

NAICS code 621999All Other Miscellaneous Ambulatory Health Care Services — is used in SAM.gov to identify businesses whose primary activity falls within this classification. When you add this code to your SAM.gov entity registration, contracting officers searching for vendors in the Other Ambulatory Health Care Services space will be able to find your business.

If this code represents your primary business activity, designate it as your primary NAICS code. Your primary NAICS code determines your size standard for any contract solicited under this code. With a size standard of $20.5M average annual receipts, your business must be at or below this threshold to qualify as a small business for set-aside contracts under NAICS 621999.

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Frequently Asked Questions

What is NAICS code 621999?

NAICS code 621999 is 'All Other Miscellaneous Ambulatory Health Care Services', classified under the Health Care and Social Assistance sector (NAICS 62). 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 cent

What is the SBA small business size standard for NAICS code 621999?

The SBA defines a small business under NAICS code 621999 (All Other Miscellaneous Ambulatory Health Care Services) as one with $20.5M average annual receipts. This size standard determines eligibility for small business set-aside contracts, 8(a), HUBZone, WOSB, and SDVOSB programs in SAM.gov.

How do I register NAICS code 621999 in SAM.gov?

To register NAICS code 621999 in SAM.gov: (1) Log in at sam.gov, (2) Navigate to your Entity Registration, (3) Go to the Assertions section, (4) Add 621999 (All Other Miscellaneous Ambulatory Health Care Services) to your NAICS code list. You may designate one code as your Primary NAICS code.

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Related NAICS Codes

Other codes in Other Ambulatory Health Care Services

Related PSC Codes

PSC codes commonly used with this NAICS sector

Source: GSA PSC Manual April 2025

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