Which volume in the ICD-10 system provides an instructional guide on coding?

Volume 2 of the ICD-10 system is dedicated to providing an instructional guide on coding. It contains essential information regarding the classification of diseases, as well as guidelines and conventions needed for proper coding. This volume is crucial for coders because it outlines the official coding guidelines, which help ensure that the coding process adheres to standardized practices. It also includes the index of diseases and procedures, providing coders with a systematic approach to finding the right codes for patient diagnoses and treatments.

The other volumes serve different purposes; for example, Volume 1 contains the tabular list of diagnoses, and Volume 3 includes codes for surgical procedures and services. Therefore, while those volumes are important in understanding and utilizing the ICD-10 system, Volume 2 is specifically designed to instruct coders on how to apply the coding system effectively.