ICD-10 Code H47.42 – Disorders of optic chiasm in (due to) neoplasm (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H47.42 – Disorders of optic chiasm in (due to) neoplasm
What it is
This code identifies a disorder of the optic chiasm caused by a neoplasm. Use it when a tumor or tumor-related effect involves the optic chiasm and documentation supports that relationship.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings may include visual field loss, reduced visual acuity, or other signs of optic pathway compression.
When to use this code
Use H47.42 when the provider documents an optic chiasm disorder due to a neoplasm, including direct invasion or compression. It may apply in imaging, neurology, ophthalmology, or oncology notes when the chiasm is specifically implicated. Check documentation if the tumor site or cause is unclear.
Do not use for
Do not use this code for nonspecific visual complaints without documented optic chiasm involvement. If the record does not link the disorder to a neoplasm, choose a different diagnosis.
Coding tip
Confirm both the optic chiasm involvement and the neoplastic cause in the chart before assigning H47.42.