NAICS Code Description

621493 - Freestanding Ambulatory Surgical and Emergency Centers

*Click to View Top Businesses by Revenue for 621493 – Complete Profiles*.

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 trauma centers (except hospitals)
Freestanding emergency medical centers and clinics
Urgent medical care centers and clinics (except hospitals)


  • Physician walk-in centers are classified in U.S. Industry 621111, Offices of Physicians (except Mental Health Specialists); and
  • Establishments known and licensed as hospitals that also perform ambulatory surgery and emergency room services are classified in Subsector 622, Hospitals.
Index Entries for 621493
621493621493621493Ambulatory surgical centers and clinics, freestanding
621493621493621493Emergency medical centers and clinics, freestanding
621493621493621493Freestanding ambulatory surgical centers and clinics
621493621493621493Freestanding emergency medical centers and clinics
621493621493621493Laser surgery centers, freestanding
621493621493621493Trauma centers (except hospitals), freestanding
621493621493621493Urgent medical care centers and clinics (except hospitals), freestanding

Top Businesses by Annual Sales for 621493 – Click for Complete Profiles:

Symbion IncBrentwoodTN
Institute For Family HealthNew YorkNY
Foundation Health Systems CorpWinston SalemNC
Novamed IncNashvilleTN
Neighbors Emergency Center LLCHoustonTX
Mercy Care Management IncCedar RapidsIA
Ecc Management LLCIrvingTX
East Ark Fmly Hlth Ctr IncWest MemphisAR
Carespot of Austin LLCBrentwoodTN