Malignant neoplasm of parametrium

This code signifies a malignant cancerous growth originating in the parametrium, which is the fibrous and fatty tissue surrounding the uterus, extending laterally from the cervix. This neoplasm can involve the connective tissue, blood vessels, and nerves within this region.

Use this code when documentation clearly indicates a primary malignant tumor located specifically within the parametrial tissue. This diagnosis is typically established through biopsy and histopathological examination, often following imaging studies like MRI or CT scans.

• Differentiate from malignant neoplasms of the uterus (C54.-) or cervix (C53.-) which are distinct anatomical sites.
• Ensure the documentation specifies "parametrium" and not a general pelvic malignancy to avoid miscoding.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter, unless a more specific primary site is identified and this is a secondary involvement.