Malignant neoplasm of colon, unspecified site

This code signifies a cancerous tumor originating in the large intestine, where the specific anatomical location within the colon (e.g., ascending, transverse, descending, sigmoid) has not been identified or documented. It indicates a primary malignancy of the colon without further site specification.

This code is appropriate when documentation confirms a diagnosis of colon cancer but lacks detail regarding the precise segment of the colon involved. It should be used when the physician's notes state "colon cancer, unspecified" or similar phrasing without further anatomical specificity.

• Avoid using this code if any specific colon segment (e.g., ascending colon, sigmoid colon) is documented; instead, use the more precise site-specific code.
• Query the physician for clarification on the tumor's exact location if possible, to allow for more specific coding.
• This code represents a primary malignancy; do not use it for metastatic disease to the colon.