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The correct answer is Category III Codes. These codes are a subset of the Current Procedural Terminology (CPT) coding system and are used to represent emerging technology, procedures, and services that are not yet widely accepted or performed. Category III Codes are indeed identified by an alphanumeric structure where the last character is a letter. This unique distinction signifies that these codes are temporary and allow for data collection on new services or procedures.

In contrast, Category II Codes are supplementary tracking codes that are used to facilitate data collection for performance measures and are not typically associated with the last character being a letter. Case Management Services and Case Mix do not directly relate to the CPT coding system in the same manner as the Category III Codes do. Therefore, the focus on the alphanumeric identifier, especially the inclusion of a letter at the end, clearly indicates that Category III Codes is the correct choice in this context.