ICD-10 Code C69.8 – Malignant neoplasm of overlapping sites of eye and adnexa (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C69.8 – Malignant neoplasm of overlapping sites of eye and adnexa
What it is
C69.8 identifies a malignant tumor of the eye or surrounding adnexal structures that spans more than one overlapping site. Use it when the primary site cannot be assigned to a single more specific eye or adnexal location.
Clinical signs
Clinical features vary; refer to documentation. Findings may include a documented malignant mass involving overlapping ocular or adnexal structures, with pathology or specialist assessment supporting cancer.
When to use this code
Use this code when the provider documents a malignant neoplasm involving overlapping sites of the eye and adnexa and no single site is identified. It is appropriate when the record clearly states overlapping involvement or the tumor crosses anatomic boundaries. Check documentation if the exact subsite is uncertain.
Do not use for
Do not use this code for benign eye or adnexal lesions, metastatic disease to the eye, or a malignancy limited to one specific ocular site with a more precise code available.
Coding tip
Query the provider if the note describes multiple eye structures but does not explicitly confirm overlapping malignant involvement.