## **Core Concept**
The International Classification of Diseases, Tenth Revision (ICD-10), is a globally used diagnostic tool for epidemiology, health management, and clinical purposes. The ICD-10 is published by the World Health Organization (WHO) and provides a systematic way to code and classify diseases, symptoms, and procedures. Understanding the structure and organization of the ICD-10 is essential for medical professionals.

## **Why the Correct Answer is Right**
The ICD-10 is structured into chapters that group similar diseases or conditions together. This organization facilitates the classification and coding of diseases and health problems. The correct number of chapters in the ICD-10 is crucial for navigating and utilizing the classification system effectively.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option suggests a specific number of chapters but is incorrect based on the accurate count.
- **Option B:** Similarly, this option provides another incorrect number.
- **Option D:** This option also presents an incorrect count of chapters in the ICD-10.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the ICD-10 consists of **22 chapters**. These chapters cover a wide range of conditions, from infectious and parasitic diseases to factors influencing health status and contact with health services. Knowing the organization of the ICD-10 can help in quickly locating specific codes and understanding the classification system.

## **Correct Answer:** . **22**