What H46 covers · when clinicians use it
ICD-10 code H46 identifies Optic neuritis in the U.S. ICD-10-CM clinical and billing record set. It sits within the Eye and Adnexa chapter (H00–H59), the section that groups related diagnoses so providers, payers, and public-health agencies report them consistently. Clinicians and medical coders apply H46 when an encounter's findings match the Optic neuritis description, attaching it to the patient record so downstream insurance claims, payer audits, quality reporting, and epidemiological surveillance all reference the same standardized diagnosis. The ICD-10-CM is maintained by the Centers for Medicare & Medicaid Services and the CDC's National Center for Health Statistics, with an updated official code set released each U.S. fiscal year — always verify H46 against the current CMS/CDC release and your payer's documentation guidance before final use. This page summarizes documentation context for H46 and is a coding reference, not clinical, diagnostic, or billing advice.
H46 refers to Optic neuritis, a group of conditions involving inflammation or damage to the optic nerve or visual pathways. These can be caused by autoimmune disorders, infections, trauma, or compressive lesions, and they often present with acute or progressive vision changes.
Symptoms
- Sudden vision loss – Common in optic neuritis (H46)
- Pain with eye movement – A classic sign of acute optic neuritis
- Color vision deficiency – Especially red desaturation
- Visual field defects – Seen in optic neuropathy or chiasmal lesions (H47)
- Optic disc swelling or pallor – Observed on fundus examination
- Headache or neurological symptoms – May accompany visual pathway involvement
- Progressive or bilateral vision loss – Often seen in compressive or hereditary optic neuropathies
Diagnosis
Diagnosis of Optic neuritis includes detailed ophthalmic exam, visual acuity and color testing, visual field assessment, fundus exam, optical coherence tomography (OCT), and MRI of the orbits and brain. Blood tests or lumbar puncture may be needed to assess systemic or infectious causes.
ICD10 Code Usage
ICD10 code H46 is primarily used by ophthalmologists and neurologists. It supports diagnostic workups for unexplained vision loss, documents demyelinating diseases like multiple sclerosis, and justifies advanced imaging, corticosteroid therapy, or neurology referrals.
Related Codes
FAQs
Q1: What is ICD10 code H46?
A: It refers to Optic neuritis, involving inflammatory, ischemic, compressive, or degenerative damage to the optic nerve or visual pathways.
Q2: Is optic neuritis reversible?
A: Often yes—many patients recover vision partially or completely within weeks, especially with treatment.
Q3: What are common causes?
A: Autoimmune diseases (like MS), infections, ischemia, trauma, or hereditary optic neuropathies.
Q4: How is it treated?
A: High-dose IV steroids for optic neuritis; surgery or systemic therapy for compressive or ischemic causes.
Q5: Who manages these conditions?
A: Neurologists, ophthalmologists, and sometimes neuro-ophthalmologists or neurosurgeons.
Conclusion
ICD10 code H46 enables timely identification and management of Optic neuritis, helping clinicians prevent permanent vision loss through early intervention, imaging, and systemic evaluation.