Malignant neoplasm of lacrimal duct

This code signifies a primary cancerous tumor originating in the lacrimal duct, which is part of the tear drainage system of the eye. This malignancy involves the epithelial cells lining the duct, leading to abnormal growth and potential obstruction of tear flow.

Apply this code when documentation explicitly states a primary malignant neoplasm of the lacrimal duct. This diagnosis is typically confirmed through biopsy and histopathological examination. Clinical scenarios may include patients presenting with epiphora, a palpable mass in the lacrimal sac area, or bloody tears, where subsequent workup reveals malignancy of the lacrimal duct.

• Ensure the documentation specifies "malignant" and "lacrimal duct" to differentiate from benign lesions or involvement of other lacrimal structures.
• Do not use for secondary malignancies; this code is for primary site involvement.
• Confirm laterality (left, right, or bilateral) if specified in the documentation, though ICD-9-CM does not provide laterality for this specific code.