NAICS Code 621493 — Freestanding Ambulatory Surgical and Emergency Centers

National Industry in the official 2022 North American Industry Classification System (U.S. Census Bureau). It is one of 4 national industries under 62149 (Other Outpatient Care Centers).

Code	621493
Title	Freestanding Ambulatory Surgical and Emergency Centers
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	$19 million in average annual receipts

Official definition (2022 NAICS)

This U.S. industry comprises establishments with physicians and other medical staff primarily engaged in (1) providing surgical services (e.g., orthoscopic and cataract surgery) on an outpatient basis or (2) providing emergency care services (e.g., setting broken bones, treating lacerations, or tending to patients suffering injuries as a result of accidents, trauma, or medical conditions necessitating immediate medical care) on an outpatient basis. Outpatient surgical establishments have specialized facilities, such as operating and recovery rooms, and specialized equipment, such as anesthetic or X-ray equipment.

Illustrative Examples:

Freestanding ambulatory surgical centers and clinics

Freestanding emergency medical centers and clinics

Freestanding trauma centers (except hospitals)

Urgent medical care centers and clinics (except hospitals)

Cross-References.

Is a business under 621493 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 621493 qualifies as a small business if it does not exceed $19 million in average annual receipts. Small-business status determines eligibility for federal set-aside contracts, SAM.gov certifications and SBA loan programs — receipts are averaged over the latest 5 fiscal years.

Where 621493 sits in the hierarchy

Level	Code	Title
Sector	62	Health Care and Social Assistance
Subsector	621	Ambulatory Health Care Services
Industry Group	6214	Outpatient Care Centers
NAICS Industry	62149	Other Outpatient Care Centers
National Industry	621493	Freestanding Ambulatory Surgical and Emergency Centers

Related SIC codes

Via the official U.S. Census concordance (1987 SIC ↔ NAICS), shown only where the industry definition is unchanged in NAICS 2022.

SIC code	Title
8011	Offices and Clinics of Doctors of Medicine

Related National Industry codes

• 621491 — HMO Medical Centers
• 621492 — Kidney Dialysis Centers
• 621498 — All Other Outpatient Care Centers

Data: official 2022 NAICS structure, descriptions and Census concordances, U.S. Census Bureau — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.