ICD chapter 21 includes all except –
**Core Concept**
ICD Chapter 21 deals with Schizophrenia, schizotypal and delusional disorders. This chapter is crucial in psychiatric diagnosis and classification, and it is essential for clinicians to understand the ICD-10 criteria for these disorders.
**Why the Correct Answer is Right**
The correct answer is a specific disorder that is not included in ICD Chapter 21. Schizophrenia and schizotypal disorders are characterized by a disintegration of the process of thinking, which is a fundamental aspect of these mental health conditions. The ICD-10 criteria for these disorders focus on the presence of delusions, hallucinations, and disorganized thinking patterns.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is a specific type of schizophrenia that is included in ICD Chapter 21. There are several subtypes of schizophrenia, and this option is one of them.
**Option B:** This option is incorrect because it is a type of mood disorder that is included in ICD Chapter 5. Mood disorders, such as bipolar disorder, are characterized by significant mood disturbances.
**Option C:** This option is incorrect because it is a type of anxiety disorder that is included in ICD Chapter 6. Anxiety disorders, such as generalized anxiety disorder, are characterized by excessive and persistent worry or fear.
**Option D:** This option is incorrect because it is a type of personality disorder that is included in ICD Chapter 5. Personality disorders, such as borderline personality disorder, are characterized by enduring patterns of thought and behavior.
**Clinical Pearl / High-Yield Fact**
ICD Chapter 21 is a critical component of psychiatric diagnosis and classification. Clinicians must be familiar with the ICD-10 criteria for schizophrenia and schizotypal disorders to accurately diagnose and treat patients with these conditions.
**Correct Answer:** B.