ICD-10 Code D31.42 – Benign neoplasm of left ciliary body (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D31.42 – Benign neoplasm of left ciliary body
What it is
This code identifies a noncancerous tumor of the ciliary body in the left eye. It is used when the lesion is documented as benign and specifically located on the left side.
Clinical signs
Clinical features vary; refer to documentation. Benign ciliary body lesions may be found on eye exam or imaging, sometimes with visual disturbance, iris displacement, or no symptoms at all.
When to use this code
Use D31.42 when the provider documents a benign neoplasm of the left ciliary body. This applies whether the finding is incidental or evaluated because of ocular symptoms. Confirm laterality and benign nature in the record before assigning the code.
Do not use for
Do not use this code for malignant or unspecified eye tumors, or for lesions in the right eye or both eyes. If the documentation is unclear, check documentation.
Coding tip
Always verify that “left ciliary body” is explicitly documented, since laterality drives the code selection.