ICD-10 Code H16.052 – Mooren’s corneal ulcer, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.052 – Mooren’s corneal ulcer, left eye
What it is
This code identifies Mooren’s corneal ulcer affecting the left eye. It refers to a painful peripheral corneal ulceration that is not due to an obvious systemic cause; check documentation for laterality and clinical confirmation.
Clinical signs
Typical findings include a peripheral corneal ulcer, severe eye pain, redness, tearing, and photophobia. Clinical features vary; refer to documentation for slit-lamp findings and whether the lesion is progressive or bilateral.
When to use this code
Use H16.052 when the provider documents Mooren’s corneal ulcer in the left eye. It is appropriate when the diagnosis is confirmed and laterality is clearly stated in the record. If the note only says corneal ulcer without specifying Mooren’s type or eye, check documentation before coding.
Do not use for
Do not use this code for corneal ulcers from trauma, infection, or contact lens injury. It is also incorrect when the documentation does not specify Mooren’s ulcer or does not identify the left eye.
Coding tip
Verify both the Mooren’s diagnosis and left-eye laterality before assigning H16.052.