**Core Concept**
The International Classification of Diseases (ICD) is a globally used diagnostic classification system for epidemiology, health management, and clinical purposes. It is developed by the World Health Organization (WHO) and is used to classify diseases and health problems in a way that is consistent and comparable across different settings and cultures.

**Why the Correct Answer is Right**
The ICD system is a hierarchical classification system, where each code is a combination of a category and a subcategory. It is used to facilitate the collection, analysis, and presentation of health data, as well as to provide a common language for health professionals to communicate about diseases and health problems. The ICD system is regularly updated to reflect advances in medical science and to improve its accuracy and relevance.

**Why Each Wrong Option is Incorrect**
**Option A:** The ICD system is not primarily used for billing and insurance purposes, although it may be used for this purpose in some countries.
**Option B:** The ICD system is not limited to infectious diseases, but includes all types of diseases and health problems, including mental and behavioral disorders, injuries, and certain developmental anomalies.
**Option C:** The ICD system is not developed by the Centers for Disease Control and Prevention (CDC), but by the World Health Organization (WHO).

**Clinical Pearl / High-Yield Fact**
One of the key features of the ICD system is its hierarchical structure, which allows for precise classification of diseases and health problems. This hierarchy is based on a combination of categories and subcategories, with each code representing a specific level of detail.

**Correct Answer: B.**