Psych · Foundations — nosology
Psychiatric classification: DSM-5-TR and ICD-11
Also known as DSM-5-TR · ICD-11 mental disorders · Psychiatric nosology · Diagnostic classification psychiatry · Categorical vs dimensional diagnosis · HiTOP · RDoC · CDDR
Exam-exhaustive fellowship reference on psychiatric classification — ICD vs DSM history and governance, categorical vs dimensional models, ICD-11 personality and psychosis reforms, hierarchical taxonomy (HiTOP) and RDoC, reliability validity and clinical utility, dual-system clinical coding, and multi-board exam traps. FRANZCP-primary, globally tagged.
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Target exams
Red flags
- Treating DSM and ICD as interchangeable on exam stems — criteria, duration rules, and category names diverge
- Confusing reliability (agreement) with validity (truth of the construct)
- Reifying a syndrome label as a single biological disease without evidence
- Assigning personality disorder from a single acute crisis without longitudinal pattern
- Using RDoC or HiTOP as if they replace clinical diagnosis for service access and guidelines
- Letting perfect coding delay medical stabilisation or risk management
Meet the exam question
The viva opens cold: "Is psychiatric diagnosis valid?" Half the candidates freeze; the other half lecture about biomarkers. Neither scores.[2]
The mark-winning first sentence is a single split: "Validity and utility are different properties, sir." Kendell and Jablensky said it plainly in 2003 — a diagnosis can be useful for choosing an antidepressant without being a validated natural disease entity. Say that line, and the examiner stops probing and starts listening.[2]
This topic is the nosology that sits behind every syndrome page in psychiatry. There is no patient in front of you on a ward round — there is an examiner asking whether you can wield a label without worshipping it.[2][20]
References20ShowHide
- [1]Spitzer RL, Endicott J, Robins E Research diagnostic criteria: rationale and reliability Arch Gen Psychiatry, 1978.PMID 655775
- [2]Kendell R, Jablensky A Distinguishing between the validity and utility of psychiatric diagnoses Am J Psychiatry, 2003.PMID 12505793
- [3]Clarke DE, Narrow WE, Regier DA, et al. DSM-5 field trials in the United States and Canada, Part I: study design, sampling strategy, implementation, and analytic approaches Am J Psychiatry, 2013.PMID 23111546
- [4]Regier DA, Narrow WE, Clarke DE, et al. DSM-5 field trials in the United States and Canada, Part II: test-retest reliability of selected categorical diagnoses Am J Psychiatry, 2013.PMID 23111466
- [5]Narrow WE, Clarke DE, Kuramoto SJ, et al. DSM-5 field trials in the United States and Canada, Part III: development and reliability testing of a cross-cutting symptom assessment for DSM-5 Am J Psychiatry, 2013.PMID 23111499
- [6]Reed GM, First MB, Kogan CS, et al. Innovations and changes in the ICD-11 classification of mental, behavioural and neurodevelopmental disorders World Psychiatry, 2019.PMID 30600616
- [7]First MB, Gaebel W, Maj M, et al. An organization- and category-level comparison of diagnostic requirements for mental disorders in ICD-11 and DSM-5 World Psychiatry, 2021.PMID 33432742
- [8]Reed GM, First MB, Billieux J, et al. Emerging experience with selected new categories in the ICD-11: complex PTSD, prolonged grief disorder, gaming disorder, and compulsive sexual behaviour disorder World Psychiatry, 2022.PMID 35524599
- [9]Clark LA, Cuthbert B, Lewis-Fernández R, et al. Three Approaches to Understanding and Classifying Mental Disorder: ICD-11, DSM-5, and the National Institute of Mental Health's Research Domain Criteria (RDoC) Psychol Sci Public Interest, 2017.PMID 29211974
- [10]Kotov R, Krueger RF, Watson D, et al. The Hierarchical Taxonomy of Psychopathology (HiTOP): A dimensional alternative to traditional nosologies J Abnorm Psychol, 2017.PMID 28333488
- [11]Kotov R, Krueger RF, Watson D A paradigm shift in psychiatric classification: the Hierarchical Taxonomy Of Psychopathology (HiTOP) World Psychiatry, 2018.PMID 29352543
- [12]Kotov R, Cicero DC, Conway CC, et al. The Hierarchical Taxonomy of Psychopathology (HiTOP) in psychiatric practice and research Psychol Med, 2022.PMID 35650658
- [13]Insel TR The NIMH Research Domain Criteria (RDoC) Project: precision medicine for psychiatry Am J Psychiatry, 2014.PMID 24687194
- [14]Cuthbert BN, Insel TR Toward the future of psychiatric diagnosis: the seven pillars of RDoC BMC Med, 2013.PMID 23672542
- [15]Tyrer P, Mulder R, Kim YR, et al. The Development of the ICD-11 Classification of Personality Disorders: An Amalgam of Science, Pragmatism, and Politics Annu Rev Clin Psychol, 2019.PMID 30601688
- [16]Bach B, First MB Application of the ICD-11 classification of personality disorders BMC Psychiatry, 2018.PMID 30373564
- [17]Gaebel W, Kerst A, Stricker J Classification and Diagnosis of Schizophrenia or Other Primary Psychotic Disorders: Changes from ICD-10 to ICD-11 and Implementation in Clinical Practice Psychiatr Danub, 2020.PMID 33370728
- [18]Gaebel W, Stricker J, Riesbeck M, et al. Accuracy of diagnostic classification and clinical utility assessment of ICD-11 compared to ICD-10 in 10 mental disorders: findings from a web-based field study Eur Arch Psychiatry Clin Neurosci, 2020.PMID 31654119
- [19]Stein DJ, Palk AC, Kendler KS What is a mental disorder? An exemplar-focused approach Psychol Med, 2021.PMID 33843505
- [20]Macneil CA, Hasty MK, Conus P, et al. Is diagnosis enough to guide interventions in mental health? Using case formulation in clinical practice BMC Med, 2012.PMID 23016556