ICD-10-CM uses what format in its index for ease of reference?

The ICD-10-CM index utilizes an indented format to facilitate ease of reference. This layout is designed so that main terms are listed in a straightforward manner, and any sub-terms or additional details related to those main terms are indented beneath them. This hierarchical organization allows coders to quickly identify the relationship between the primary diagnosis and its associated conditions or details, making it easier to navigate through the vast array of codes available.

The indented format not only helps in quick location of codes but also visually clarifies how specific codes are related to general categories, thus streamlining the coding process and reducing the likelihood of errors. Each section within the index clearly delineates the structure, allowing medical coders to efficiently find the precise code necessary for accurate documentation and billing.