ICD-10 Code H40.833 – Aqueous misdirection, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.833 – Aqueous misdirection, bilateral
What it is
This code identifies aqueous misdirection affecting both eyes. It describes abnormal forward movement of aqueous humor within the eye, which can raise intraocular pressure and distort the normal anterior chamber.
Clinical signs
Findings may include shallow or flat anterior chambers, elevated intraocular pressure, and blurred vision. Clinical features vary; refer to documentation.
When to use this code
Use H40.833 when the provider documents aqueous misdirection in both eyes, also called malignant glaucoma in some references. Code it when the diagnosis is clearly established and laterality is bilateral. Check documentation if the note only describes postoperative pressure rise without naming the condition.
Do not use for
Do not use this code for unilateral aqueous misdirection or for other causes of increased intraocular pressure. Do not assign it when the record is nonspecific or the diagnosis is not confirmed.
Coding tip
Verify bilateral laterality and the exact provider wording before coding; if the record is unclear, check documentation.