ICD-10 Code H46 – Optic neuritis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H46 – Optic neuritis
What it is
H46 identifies optic neuritis, an inflammation of the optic nerve that can reduce vision. Use it when the record documents optic nerve inflammation rather than a broader eye disorder.
Clinical signs
Typical findings include decreased visual acuity, pain with eye movement, and reduced color vision. Clinical features vary; refer to documentation, especially if laterality or associated neurologic disease is noted.
When to use this code
Use H46 when the clinician clearly diagnoses optic neuritis in the chart. It may also apply when documentation describes optic nerve inflammation, demyelinating optic neuritis, or a confirmed optic neuritis episode. If the note only says visual loss or eye pain without diagnosis, check documentation.
Do not use for
Do not use H46 for nonspecific blurred vision, conjunctivitis, or other retinal or corneal conditions. If the provider documents a different optic nerve disorder, choose the more specific code.
Coding tip
Verify the provider’s exact diagnosis and any laterality details before assigning H46.