ICD-10 Code H44.421 – Hypotony of right eye due to ocular fistula (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H44.421 – Hypotony of right eye due to ocular fistula
What it is
H44.421 identifies abnormally low pressure in the right eye caused by an ocular fistula. Use it when documentation links the hypotony directly to a fistulous eye condition.
Clinical signs
Clinical features may include a persistently soft eye, shallow anterior chamber, or reduced vision. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents hypotony of the right eye and specifies an ocular fistula as the cause. It fits postoperative or pathologic situations only when the right eye is clearly identified. Check documentation if laterality or cause is unclear.
Do not use for
Do not use it for hypotony of the left eye, unspecified eye, or hypotony without a documented fistula cause. Avoid it when the record describes another cause of low intraocular pressure.
Coding tip
Verify both laterality and the fistula etiology in the chart before assigning H44.421.