ICD-10 Code C69.91 – Malignant neoplasm of unspecified site of right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C69.91 – Malignant neoplasm of unspecified site of right eye
What it is
This code identifies a malignant tumor in the right eye when the exact intraocular site is not documented. Use it when the record confirms cancer of the right eye but does not specify the involved structure.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings may include vision changes, eye discomfort, a visible ocular mass, or abnormal exam/imaging results confirming malignancy.
When to use this code
Use C69.91 when the provider documents malignant neoplasm of the right eye and gives no more specific site, such as retina, choroid, or conjunctiva. It also fits when the diagnosis is confirmed but laterality and eye involvement are clear while the subsite remains unspecified. Check documentation if the note is ambiguous.
Do not use for
Do not use this code for benign eye tumors, metastatic disease to the eye, or malignant neoplasms of a specified right eye site. If the documentation names a different ocular structure, code that site instead.
Coding tip
Verify laterality and the exact eye site before assigning C69.91; if a more specific right-eye subsite is documented, code that diagnosis instead.