ICD-10 Code H33.109 – Unspecified retinoschisis, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H33.109 – Unspecified retinoschisis, unspecified eye
What it is
H33.109 identifies retinoschisis, a splitting of the retinal layers, when the eye is not specified and the record does not name a more precise type. Use it when the documentation confirms retinoschisis but gives limited detail.
Clinical signs
Findings may include reduced peripheral vision, a visible retinal split on examination, or incidental detection during eye evaluation. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents retinoschisis without stating right, left, or bilateral eye involvement. It also fits cases where the note confirms the diagnosis but lacks enough detail for a more specific retinal code. Check documentation if the record mentions associated retinal detachment or a different retinal disorder.
Do not use for
Do not use it for retinal detachment, retinal tear, or other retinal splitting conditions that are separately documented. If the affected eye is specified, choose the laterality-specific code instead.
Coding tip
Query the provider when laterality or related retinal pathology is unclear, because H33.109 is only appropriate when the eye remains unspecified.