ICD-10-CM 2027 diagnosis code
H46.1Retrobulbar neuritis
H46.1 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About H46.1
H46.1 is the ICD-10-CM diagnosis code for retrobulbar neuritis. It belongs to category H46 (optic neuritis), block H46-H47 (disorders of optic nerve and visual pathways) and chapter 7 (diseases of the eye and adnexa). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.
Within H46 (optic neuritis), H46.1 is specifically for retrobulbar neuritis. Related codes cover optic papillitis (H46.0), nutritional optic neuropathy (H46.2), toxic optic neuropathy (H46.3), other optic neuritis (H46.8) and unspecified optic neuritis (H46.9).
To report this condition, pick the subcode that matches the documentation: H46.10 (unspecified eye), H46.11 (right eye), H46.12 (left eye) and H46.13 (bilateral).
Don't report H46.1 together with the conditions in its Excludes1 note: syphilitic retrobulbar neuritis (A52.15).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under H46.1
Coding notes
- Retrobulbar neuritis NOS
- syphilitic retrobulbar neuritis (A52.15)
Notes that apply from higher levels
Instructions written at a parent level also apply to H46.1.
› From H46 Optic neuritis
Broader instructions also apply from Chapter 7: Diseases of the eye and adnexa.
Alphabetic index entries
1 entriesTerms in the official ICD-10-CM index that lead to H46.1.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about H46.1
Is H46.1 billable?
- No. H46.1 is a header code. Report one of its more specific subcodes instead.