ICD-10 Code H44.429 – Hypotony of unspecified eye due to ocular fistula (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H44.429 – Hypotony of unspecified eye due to ocular fistula
What it is
This code identifies abnormally low pressure in an unspecified eye caused by an ocular fistula. Use it when the chart documents hypotony linked to an abnormal opening that allows fluid to escape.
Clinical signs
Documentation may note a soft eye, reduced intraocular pressure, or vision changes related to hypotony. Clinical features vary; refer to documentation.
When to use this code
Use H44.429 when the provider states hypotony of an unspecified eye and clearly links it to an ocular fistula. It fits postoperative, traumatic, or other documented fistula-related cases when the affected eye is not specified. If the record names a different eye or another cause, code that instead.
Do not use for
Do not use this code for hypotony without a documented ocular fistula cause. Do not use it when the chart specifies another eye or a different disorder producing low intraocular pressure.
Coding tip
Check that both the hypotony and fistula relationship are documented before assigning H44.429.