In simple words: This code is used when a doctor performs a procedure on the colon that doesn't have its own specific code. The colon is the part of your large intestine that helps process digested food.

This code is used to report a procedure on the colon for which there is no specific code available.It is essential to ensure proper documentation before billing for this unlisted procedure.

Example 1: A patient presents with a complex colon issue not adequately addressed by existing CPT codes. The surgeon performs a novel procedure to correct the problem. 45399 would be used to report this unique procedure., During a colonoscopy, a surgeon encounters an unexpected anatomical anomaly requiring an unconventional surgical approach. As this specific scenario is not covered by a dedicated CPT code, 45399 is used for billing., A patient undergoes a complex colon resection requiring innovative surgical techniques not encompassed by standard CPT codes. The surgeon uses 45399 to accurately report the procedure performed.

When using 45399, detailed documentation is crucial for proper reimbursement. This should include a comprehensive operative report, supporting diagnostic notes, and a clear explanation of the medical necessity of the procedure.A cover letter explaining the rationale for using the unlisted code, comparing it to similar procedures, and justifying the billed amount is also recommended. Providing photographs or diagrams might be beneficial in clarifying the procedure.

** It is crucial to contact the payer for pre-authorization for elective procedures billed under 45399 to avoid denials.