Various mental health professionals such as psychiatrists or clinical psychologists are involved in consultation-liaison (CL) psychiatry in general hospitals. CL is performed based on psychiatric/psychological assessments. The role of clinical psychologists as members of a CL team includes comprehensive psychological assessment, psychotherapy for patients/families, advice for consultees, and adjusting negative relationships between medical staff and patients/families or among medical staff members themselves. Collaboration with consultees is essential in the CL service. In this review, some models of CL, including the “stepped care” model, which is considered to be useful in building collaborative relationships with consultees, are described. A case example of consultation adopting the cognitive behavior model, provided by a clinical psychologist, is presented.