ICD-10 Code H47.4 – Disorders of optic chiasm (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H47.4 – Disorders of optic chiasm
What it is
H47.4 identifies disorders affecting the optic chiasm, the point where the optic nerves cross. Use it when documentation shows a chiasmal lesion or dysfunction involving visual pathway structures.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include visual field defects consistent with chiasmal involvement, especially bitemporal loss, and reduced visual acuity when the lesion affects nearby structures.
When to use this code
Use H47.4 when the provider documents an optic chiasm disorder, such as compression, lesion, or other chiasmal abnormality. It may also apply when imaging or specialist assessment identifies chiasmal pathology causing visual symptoms. If the note only describes nonspecific visual complaints, check documentation before coding this category.
Do not use for
Do not use this code for optic nerve disorders, retinal disease, or general visual disturbance without chiasmal involvement. If the record does not clearly identify the optic chiasm as the affected site, check documentation.
Coding tip
Code H47.4 only when the affected anatomy is explicitly the optic chiasm, and support it with the provider’s documented diagnosis.