This U.S. industry comprises establishments with medical staff primarily engaged in providing general or specialized outpatient care (except family planning centers, outpatient mental health and substance abuse centers, HMO medical centers, kidney dialysis centers, and freestanding ambulatory surgical and emergency centers). Centers or clinics of health practitioners with different degrees from more than one industry practicing within the same establishment (i.e., Doctor of Medicine and Doctor of Dental Medicine) are included in this industry. Illustrative Examples: Outpatient biofeedback centers and clinics Outpatient pain therapy centers and clinics Outpatient community health centers and clinics Outpatient sleep disorder centers and clinics Cross-References. ? Physician walk-in centers are classified in U.S. Industry 621111, Offices of Physicians (except Mental Health Specialists); ? Centers and clinics of health practitioners from the same industry primarily engaged in the independent practice of their profession are classified in Industry 62111, Offices of Physicians; Industry 621210, Offices of Dentists; and Industry Group 6213, Offices of Other Health Practitioners; ? Family planning centers are classified in Industry 621410, Family Planning Centers; ? Outpatient mental health and substance abuse centers are classified in Industry 621420, Outpatient Mental Health and Substance Abuse Centers; ? HMO medical centers are classified in U.S. Industry 621491, HMO Medical Centers; ? Dialysis centers are classified in U.S. Industry 621492, Kidney Dialysis Centers; and ? Freestanding ambulatory surgical and emergency centers are classified in U.S. Industry 621493, Freestanding Ambulatory Surgical and Emergency Centers.