ICD-10 Code H04.431 – Chronic lacrimal mucocele of right lacrimal passage (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H04.431 – Chronic lacrimal mucocele of right lacrimal passage
What it is
This code identifies a chronic mucus-filled dilation in the right lacrimal drainage system. It means the tear passage is persistently blocked or distended, causing a localized mucocele.
Clinical signs
Typical findings include chronic swelling or fullness near the inner corner of the right eye and reduced tear drainage. Clinical features vary; refer to documentation for laterality and chronicity.
When to use this code
Use H04.431 when the record specifically documents a chronic mucocele involving the right lacrimal passage. You should also use it when the provider describes a persistent lacrimal sac or duct cystic enlargement on the right. Check documentation if the note only says epiphora or obstruction without a mucocele diagnosis.
Do not use for
Do not use this code for acute lacrimal swelling, nonspecific tearing, or left-sided disease. If the chart does not clearly state chronic mucocele of the right side, check documentation.
Coding tip
Verify both chronicity and right laterality in the provider’s note before assigning H04.431.