Columbia Ancillary Services is a Joint Commission Accredited, family-owned business that has provided Oxygen, DME and Negative Pressure Wound Therapy to Nursing Homes, Personal Care Homes, Hospitals, Home Health and VA's spanning 4 States since 1991. CAS focusses on providing quality, cost effective products and specializes on providing exceptional customer service from our professional staff of nurses, respiratory therapists, home health specialists and our manufacturer trained technical staff.