ICD-10 Code H16.063 – Mycotic corneal ulcer, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.063 – Mycotic corneal ulcer, bilateral
What it is
This code identifies fungal infection of the cornea in both eyes, causing an ulcerative corneal lesion. Use it when documentation clearly states a mycotic corneal ulcer affecting both sides.
Clinical signs
Typical findings include corneal opacity, epithelial defect, pain, redness, tearing, and reduced vision. Clinical features vary; refer to documentation.
When to use this code
Use H16.063 when the provider documents bilateral fungal corneal ulceration, keratomycosis, or mycotic ulcer of both corneas. Code it from ophthalmology or inpatient documentation when both eyes are specifically involved. Check documentation if laterality is unclear.
Do not use for
Do not use this code for bacterial, viral, or noninfectious corneal ulcers. It is also incorrect when only one eye is affected or when the record does not confirm a fungal cause.
Coding tip
Confirm both fungal etiology and bilateral laterality in the provider note before assigning H16.063.