ICD-10 Code H40.831 – Aqueous misdirection, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.831 – Aqueous misdirection, right eye
What it is
This code identifies aqueous misdirection affecting the right eye. It describes a glaucoma-related condition in which fluid is misdirected within the eye, leading to abnormal pressure dynamics.
Clinical signs
Clinical features vary; refer to documentation. Commonly, you may see shallow anterior chamber, elevated intraocular pressure, and a painful or blurred right eye.
When to use this code
Use H40.831 when the provider documents aqueous misdirection specifically in the right eye. It is appropriate for confirmed diagnosis, follow-up care, or evaluation notes that clearly identify the condition and laterality.
Do not assign it for unspecified glaucoma, generic increased eye pressure, or other causes of shallow chamber unless the note states aqueous misdirection.
Do not use for
Do not use this code when the documentation only says glaucoma, ocular hypertension, or postoperative pressure rise without aqueous misdirection. Check documentation if laterality is not clearly stated.
Coding tip
Verify both the diagnosis and the right-eye laterality in the provider note before coding.