Malignant neoplasm of unspecified site of right eye

This code signifies the presence of a cancerous tumor originating in the right eye, where the specific anatomical location within the eye has not been determined or documented. It indicates a primary malignant growth rather than a secondary (metastatic) lesion.

Apply this code when documentation confirms a malignant neoplasm of the right eye, but the physician's notes do not specify a more precise site (e.g., conjunctiva, cornea, retina, choroid, ciliary body, lacrimal gland). This is typically used when initial diagnostic work-up is incomplete or the exact origin cannot be definitively identified.

• Avoid using this code if a more specific anatomical site within the right eye is documented; always code to the highest level of specificity.
• Ensure the laterality (right eye) is clearly stated in the medical record.
• If the malignancy is secondary (metastatic to the eye), a different code from the C79 category would be appropriate, along with the primary site.