ICD-10-CM 2027 diagnosis code
H33.1Retinoschisis and retinal cysts
H33.1 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 H33.1
H33.1 is the ICD-10-CM diagnosis code for retinoschisis and retinal cysts. It belongs to category H33 (retinal detachments and breaks), block H30-H36 (disorders of choroid and retina) 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 H33 (retinal detachments and breaks), H33.1 is specifically for retinoschisis and retinal cysts. Related codes cover retinal detachment with retinal break (H33.0), serous retinal detachment (H33.2), retinal breaks without detachment (H33.3), traction detachment of retina (H33.4) and other retinal detachments (H33.8).
To report this condition, pick the subcode that matches the documentation: H33.10 (retinoschisis), H33.11 (serrata), H33.12 (retina) and H33.19 (cysts).
Don't report H33.1 together with the conditions in its Excludes1 note: congenital retinoschisis (Q14.1) and microcystoid degeneration of retina (H35.42-).
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 H33.1
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to H33.1.
Broader instructions also apply from Chapter 7: Diseases of the eye and adnexa.
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 H33.1
Is H33.1 billable?
- No. H33.1 is a header code. Report one of its more specific subcodes instead.