Ten largest ASC companies by the number of operating rooms:
1. Envision Healthcare: 720
2. HCA Surgery Center Division (Nashville, Tenn.): 693
3. SurgCenter Development (Towson, Md.): 225
4. Physicians Endoscopy (Jamison, Pa.): 186
5. Covenant Physician Partners (Nashville, Tenn.): 145
6. American Vision Partners (Tempe, Ariz.): 73
7. Azura Vascular Care (Malvern, Pa.): 62
8. ASCs of America (Hanover, Mass.): 58
9. Sovereign Healthcare (Mission Viejo, Calif.): 55
10. Barnet Dulaney Perkins Eye Center Corporation (Phoenix): 55
