H46.10 Retrobulbar neuritis, unspecified eye

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from H46 Optic neuritis

Excludes2 (not included here)

• ischemic optic neuropathy (H47.01-)
• neuromyelitis optica [Devic] (G36.0)

Applies from H46.1 Retrobulbar neuritis

Applicable to

• Retrobulbar neuritis NOS

Excludes1 (never code together)

• syphilitic retrobulbar neuritis (A52.15)

MS-DRG index

Defines the logic of DRG(s) 123 in MDC 02.

Approximate ICD-9-CM (GEMs)

• 377.32 Retrobulbar neuritis (acute) (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Unspecified code (laterality): Unspecified codes for which a more specific code identifying laterality (right, left, bilateral) exists within the same code family.

Code annotations containing back-references to H46.10

Back-references to H46

• Type 1 Excludes: G36.0 Neuromyelitis optica [Devic] ("optic neuritis NOS (H46)")
• Type 2 Excludes: G52 Disorders of other cranial nerves ("disorders of optic [2nd] nerve (H46, H47.0)")

Nearby codes

• H46.00 Optic papillitis, unspecified eye
• H46.01 Optic papillitis, right eye
• H46.02 Optic papillitis, left eye
• H46.03 Optic papillitis, bilateral
• H46.1 Retrobulbar neuritis
• H46.10 Retrobulbar neuritis, unspecified eye (this code)
• H46.11 Retrobulbar neuritis, right eye
• H46.12 Retrobulbar neuritis, left eye
• H46.13 Retrobulbar neuritis, bilateral
• H46.2 Nutritional optic neuropathy
• H46.3 Toxic optic neuropathy