Hundreds of thousands of mental health professionals and students have relied on this authoritative reference, now in an updated 9th 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.