What is NAICS code 621511?

NAICS 621511 is the industry "Medical Laboratories" in the North American Industry Classification System, part of the Health Care and Social Assistance sector (62).

What is the size standard for NAICS 621511?

The SBA sets a small business size standard for each NAICS code, either average annual receipts or number of employees. Check the current value for 621511 in the SBA table of size standards on sba.gov; it changes from time to time.

NAICS Code 621511: Medical Laboratories

NAICS code 621511 is the industry for medical laboratories in the Health Care and Social Assistance sector. Agencies tag every federal contract with a NAICS code, so this is the code to list in your SAM.gov registration and to search for bids.

Government contracts under NAICS 621511

Federal agencies obligated $1.1B on contracts under NAICS 621511 from FY2024 to FY2026, including $287M in FY2026. The biggest buyers were the Department of Veterans Affairs, the Department of Defense, the Department of Justice. The largest contractors were Laboratory Corporation of America, Quest Diagnostics Incorporated, Foundation Medicine, Inc..

See the full breakdown: government medical laboratories contracts, who wins and who buys.

Open government bids for NAICS 621511

The newest open notices from SAM.gov. Bidding needs a free SAM.gov registration.

Q301--Reference and Esoteric Laboratory Testing
Veterans Affairs, Department of · Solicitation · NAICS 621511
Posted Oct 30, 2026 · Responses due Nov 30, 2026
Q301--New Reference Lab Testing | Legacy VISN 15
Veterans Affairs, Department of · Solicitation · NAICS 621511 · KS · No Set aside used
Posted Oct 30, 2026 · Responses due Dec 4, 2026

See all 2 open bids under NAICS 621511

Small business size standard for NAICS 621511

To bid on small business set-aside contracts under NAICS 621511, your business must be small under the SBA size standard for this code, measured either by average annual receipts or by number of employees. The values are updated periodically, so check the current SBA table of size standards before you bid.

Other NAICS codes in 6215

NAICS 621512: Diagnostic Imaging Centers

How to choose the right NAICS code

Pick the 6-digit code that best describes what you sell. List it as your primary code in SAM.gov, and add other codes for related work. Agencies choose one NAICS code for each contract, so check the codes on past awards for the kind of work you do. Search all codes in the NAICS code lookup.

Related guides

Frequently asked questions

What is NAICS code 621511?: NAICS 621511 is the industry "Medical Laboratories" in the North American Industry Classification System, part of the Health Care and Social Assistance sector (62).
What is the size standard for NAICS 621511?: The SBA sets a small business size standard for each NAICS code, either average annual receipts or number of employees. Check the current value for 621511 in the SBA table of size standards on sba.gov; it changes from time to time.
Are there government contracts for NAICS 621511?: Yes. Federal agencies obligated $1.1B on contracts under NAICS 621511 from FY2024 to FY2026, and 2 notices are open right now.