In difficult medical matters, the claims adjuster in disability insurance can obtain an expert opinion. The proper clarification of whether an illness exists is a prerequisite for answering the core question of disability benefit regulation: To what extent do the actual health limitations affect the insured's professional activity? Experts from various fields are involved in answering this sometimes complex question. A particular challenge is the assessment of neurological and psychological disorders, as they are internal processes that are not easily objectified. In recent years, their share within disability benefit applications has significantly increased. The judiciary expects objectivity and clarity from the experts and their statements regarding the findings.