What does a fourth character value of 8 in Table 9WB denote?

In Table 9WB of the ICD-10-PCS code system, a fourth character value of 8 specifically denotes the "rib cage." This coding system uses a structured format where each character in the code has a specific meaning, providing granular detail about the anatomy being referenced. The fourth character is particularly significant as it identifies a body part within a broader category.

In terms of context, the other options represent different anatomical structures with their own designated values in the coding system. For instance, the skull, sacral region, and pelvis are coded separately, with their own unique character designations. Therefore, a coding value of 8 in this context directs the coder specifically to the rib cage, positioning it firmly within the hierarchy of anatomical references used in ICD-10-PCS. This distinction is crucial for accurate coding and billing, ensuring that the correct procedures and services are associated with the right anatomical sites.