ICD-10 Code H44.422 – Hypotony of left eye due to ocular fistula (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H44.422 – Hypotony of left eye due to ocular fistula
What it is
This code identifies abnormally low intraocular pressure in the left eye caused by an ocular fistula. Use it when documentation links the hypotony directly to that fistulous connection.
Clinical signs
Typical findings may include a soft eye, reduced anterior chamber depth, or decreased vision. Clinical features vary; refer to documentation.
When to use this code
Use H44.422 when the provider documents hypotony of the left eye and states the cause is an ocular fistula. It is appropriate when the laterality and etiology are both specified in the record. If the chart does not clearly connect the low pressure to a fistula, check documentation.
Do not use for
Do not use this code for hypotony without a documented ocular fistula, or when the affected eye is not the left eye. Check documentation for the correct laterality and cause.
Coding tip
Code the underlying fistula-related hypotony only when the provider explicitly documents the causal relationship.