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Category III CPT codes are temporary codes designed for new and emerging technologies and services that don’t yet have broad acceptance for standard Category I coding. They provide a way to collect data on utilization, safety, and outcomes as innovations are tested and adopted, helping determine whether these technologies should become part of routine practice. Because they are experimental or in early use, payer coverage can vary, and codes may be added, revised, or removed as evidence evolves. If a technology becomes widely used and proven, it can move into Category I. These codes are distinct from ICD diagnosis coding and from Category II codes, which are used for supplemental tracking of performance measures rather than for new technologies.