Which chapter in ICD-10-CM focuses on Z codes?

The correct chapter that focuses on Z codes in ICD-10-CM is Chapter 21, which is sometimes referenced as Chapter 20 in some contexts, but it is essential to note that the Z codes specifically deal with factors influencing health status and contact with health services. These codes provide additional information about a patient's health, such as personal and family medical histories, social circumstances, and potential health issues.

Z codes are used when there is no diagnosis or when a health condition is not present but the healthcare provider needs to document the situation or context affecting the patient's health. For instance, they may indicate a patient's status after treatment for a particular condition or identify issues like environmental factors or living conditions that could affect health.

In the context of the options given, while some numbers may not directly reference the appropriate chapter according to conventional coding practices, it’s essential to recognize that Z codes occupy a distinct section dedicated to capturing these non-specific health-related factors, making them crucial for comprehensive patient documentation and care.