What is the code for a secondary neoplasm of the descending colon?

The correct code for a secondary neoplasm of the descending colon is C78.5. This code specifically identifies secondary malignant neoplasms that are located in the gastrointestinal tract, including the colon.

C78.5 is used to denote secondary malignant neoplasms in the colon, while other codes, like C78.0, refer to the specific site of secondary cancers in the lungs, and C78.3 and C78.9 are used for other anatomical sites or unspecified areas related to the presence of secondary neoplasms. Each code is part of the broader ICD-10-CM coding system, which categorizes diseases and health conditions based on their nature and location to facilitate accurate communication and billing in healthcare settings.