Malignant neoplasm of pylorus

This code signifies a cancerous tumor originating in the pylorus, the muscular valve that regulates the flow of partially digested food from the stomach to the duodenum. It represents a primary malignancy of this specific anatomical region within the stomach.

Use this code when documentation clearly indicates a confirmed diagnosis of malignant neoplasm localized to the pylorus. This diagnosis is typically established through biopsy and histopathological examination. Supporting documentation would include pathology reports, operative notes detailing tumor location, and physician progress notes.

• Differentiate from other gastric malignancies; ensure the documentation specifies "pylorus" and not just "stomach, unspecified part."
• Do not use for benign tumors or secondary metastatic lesions to the pylorus.
• Consider sequencing with codes for any associated symptoms, complications, or treatment modalities (e.g., chemotherapy, surgery).