The Home Care Clinical Specialist - OASIS (HCS-O) certification is held by clinicians who have demonstrated the clinical skills and judgment necessary to assess a patient's condition correctly. HCS-O credential holders are healthcare professionals with specialized knowledge in applying clinical assessment findings to OASIS items. HCS-O credential holders include Registered Nurses, Physical Therapists, Occupational Therapists, Speech Language Pathologists, Coding Specialists, Billing Specialists, Compliance Directors, Quality Assurance Directors, Administrators, and Agency Directors.