delirium in ICD 10 is calssified under
**Question:** delirium in ICD 10 is classified under
A. F00-F99 - Mental disorders
B. R00-R99 - Symptoms, signs, and ill-defined conditions
C. Z00-Z99 - Encounter procedures and conditions
D. T00-T24 - Injury, poisoning, and certain other consequences of external causes
**Correct Answer:** A. F00-F99 - Mental disorders
**Core Concept:**
Delirium is a neuropsychiatric disorder characterized by acute onset of confusion, cognitive impairment, and fluctuating course. The International Classification of Diseases (ICD) is a standard tool for coding and classifying diseases and health conditions used worldwide. ICD-10 is the tenth revision of the ICD, which categorizes diseases and health conditions into different groups.
**Why the Correct Answer is Right:**
In the ICD-10 classification, delirium is classified under "F00-F99" - Mental disorders, specifically in the "F" section. This is because delirium is a condition affecting the mental status and cognitive functions, which fall under the broader category of mental disorders.
**Why Each Wrong Option is Incorrect:**
**Option A: R00-R99 - Symptoms, signs, and ill-defined conditions**
This option is incorrect because delirium is a specific mental disorder, not a general symptom or sign.
**Option B: T00-T24 - Injury, poisoning, and certain other consequences of external causes**
This option is incorrect as delirium is a medical condition, not an external cause or consequence of an external event.
**Option C: Z00-Z99 - Encounter procedures and conditions**
This option is incorrect as delirium is a mental disorder, not a procedure or condition related to a medical encounter.
**Option D: Mental disorders (F00-F99)**
While delirium is indeed a mental disorder, it is placed under "F" section due to its specific focus on acute disorders affecting consciousness, cognition, and behavior.
**Clinical Pearl:**
Understanding the correct ICD-10 classification helps healthcare professionals accurately code and document delirium cases, ensuring proper data analysis and research. It is essential to know the appropriate classification for accurate diagnosis, treatment, and research purposes.