CPT code 0845T is an add‑on procedural code that captures clinical staff work to scan and digitize whole‑slide images from glass microscope slides to support immediate or deferred pathologic diagnosis. As digital pathology and telepathology applications expand, this code documents the additional labor associated with slide digitization separate from the primary staining and interpretation services. Nationally, accurate reporting of this code affects coding consistency, workflow documentation, and visibility into resource use for digital pathology.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the code's clinical intent and service setting, guidance on typical reporting context, and pointers to related billing practices. The publication outlines benchmarking considerations for add‑on imaging services, common modifiers reported with imaging add‑on work, and the clinical implications for pathology workflows that adopt whole‑slide imaging. Data not available in the input is noted where applicable.

This summary is intended to inform coding staff, billing managers, and pathology leaders about the role of CPT code 0845T in documenting digitization work for immunofluorescent and other slide‑based diagnostic processes, and to clarify the national policy and billing context relevant to digital pathology adoption.