Psychiatry: core clinical skills
Classification: ICD-11 & DSM-5-TR
Classification is the system for naming and grouping mental disorders, mainly WHO's ICD-11 and the American Psychiatric Association's DSM-5-TR. Psychiatrists use these to make diagnoses that others can understand, for treatment, records, research and legal purposes.
Depth by stage, Pre-U → Consultant (details)
What is it?
Mental disorders are diagnosed mainly by their pattern of symptoms, course and impact, because there are no definitive lab tests. Classification systems set out shared definitions so that a diagnosis means the same thing in Kuala Lumpur, London or New York.
The two main systems are the International Classification of Diseases, 11th revision (ICD-11), produced by the World Health Organization and in effect since 2022, and the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR), published in 2022 by the American Psychiatric Association. They are similar but not identical.
Malaysia's Ministry of Health uses the ICD system for official coding, while DSM is widely used in research, teaching and many textbooks. Trainees learn both, along with their history, the debate about categories versus dimensions, and their limits across cultures.
Why does a psychiatrist need it?
A clear, standard diagnosis is needed to choose treatment, communicate with colleagues, write medical and legal reports, apply for insurance or disability benefits, and conduct research. Psychiatrists also need to understand the limits of diagnoses so they do not reduce a person to a label.
What level is expected at each stage?
Scale: 1. Aware → 2. Understands → 3. Applies → 4. Masters / Teaches. What the levels mean.
- Pre-UNot expected
- Pre-clinicalAwareAware that diseases are coded and classified (ICD) for records and statistics.
- ClinicalUnderstandsUses diagnostic criteria for common disorders in the psychiatry posting.
- HousemanshipAwareUses diagnostic labels in documentation; little detailed use.
- Medical officerUnderstandsApplies ICD and DSM criteria to routine diagnoses under supervision.
- Psych traineeMasters / TeachesKnows the structure of ICD-11 and DSM-5-TR, key differences and debates; diagnoses accurately in exams.
- Specialist / consultantMasters / TeachesMakes complex differential diagnoses, uses classification in legal reports and teaches its limits.
What are the key topics?
Principles
- Why classify: communication, treatment, research, administration
- Categorical versus dimensional approaches
- Reliability and validity of diagnoses
- Operational criteria and their origins (Feighner, Research Diagnostic Criteria)
- Hierarchy and comorbidity
ICD-11
- Structure of the mental, behavioural and neurodevelopmental disorders chapter
- Clinical descriptions and diagnostic requirements
- Notable changes from ICD-10: complex PTSD, dimensional personality disorder model, gaming disorder, prolonged grief disorder
- Use for official coding and statistics, including in Malaysia
DSM-5-TR
- Structure and main diagnostic chapters
- Changes in DSM-5 and the 2022 text revision (e.g. prolonged grief disorder)
- Alternative model for personality disorders (Section III)
- Cultural formulation interview
- Common differences between DSM and ICD criteria
Critiques and alternatives
- Over-diagnosis and medicalisation concerns
- Cultural validity of Western categories in Asian settings
- Research Domain Criteria (RDoC) and other dimensional frameworks
- Stigma and the impact of labels
- Diagnosis in children and in intellectual disability
How is it learned and assessed?
- Introduction in the undergraduate psychiatry posting
- Daily use in case formulation and documentation during MO and trainee years
- Examined in MMed Psychiatry Part I and II and in MRCPsych Paper A and B
- Seminars on diagnostic controversies
Typical textbooks and resources
- ICD-11 Clinical Descriptions and Diagnostic Requirements for Mental, Behavioural and Neurodevelopmental Disorders — WHO
- Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR) — American Psychiatric Association
- Oxford Textbook of Psychiatry — classification chapter
- Sims' Symptoms in the Mind — Oyebode; background to diagnostic concepts
Titles are widely used examples; editions change. Use university libraries or legitimate purchases.
Common questions
Which system do Malaysian psychiatrists use, ICD or DSM?
Both are used. Official health records in Malaysia are coded with the WHO's ICD system, while DSM-5-TR is widely used in teaching, research and clinical discussion. Trainees are expected to know both.
Is a diagnosis the same as understanding the patient?
No. A diagnosis is a useful summary, but psychiatrists also build a 'formulation' that explains why this person became unwell now, what keeps the problem going and what strengths they have.