Hundreds of thousands of students and early-career mental health professionals have relied on this authoritative reference, now in an updated ninth edition including the latest terms and diagnostic codes. In a convenient large-size format, the Thesaurus covers nearly all areas of concern addressed in intakes, assessments, treatment plans, progress notes, and closing summaries. Users seeking the right wording for a clinical document can scan and select from thousands of technical terms, behavioral descriptors, and standard statements. The book provides interview questions for almost every symptomatic behavior, a huge collection of mental status questions, and hundreds of internet resources. Also featured is a list of all psychiatric ICD-10-CM diagnoses, including Z codes and medical codes essential to a comprehensive biopsychosocial evaluation. The companion website presents web links, reproducible forms from the book, and a detailed list of psychiatric medications. New to This Edition *Updated for DSM-5-TR and ICD-10-CM code changes for 2025. *Updated and new listings of assessment and screening tools. *Revised descriptors and terms pertaining to internet use, gender and sexuality, relationships, race and ethnicity, and more. *Updated treatment planning tips, web links, and psychiatric drug information.