ICD-10 Code H44.423 – Hypotony of eye due to ocular fistula, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H44.423 – Hypotony of eye due to ocular fistula, bilateral
What it is
This code identifies abnormally low pressure in both eyes caused by an ocular fistula. Use it when documentation states bilateral hypotony from a fistula-related eye condition.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include low intraocular pressure, shallow anterior chamber, or visual disturbance when the fistula is affecting both eyes.
When to use this code
Use H44.423 when the provider documents bilateral ocular hypotony specifically due to an ocular fistula. It may appear in postoperative, traumatic, or other fistula-related records if both eyes are involved. Check the note for laterality and cause before assigning the code.
Do not use for
Do not use this code for hypotony without a documented ocular fistula, or when only one eye is affected. If the cause is unclear, check documentation.
Coding tip
Verify both laterality and the causal fistula in the assessment, not just low eye pressure.