ICD-10 Code H16.06 – Mycotic corneal ulcer (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.06 – Mycotic corneal ulcer
What it is
H16.06 identifies a corneal ulcer caused by fungal infection. Use it when the record documents a mycotic ulcer of the cornea, not just a general corneal abrasion or keratitis.
Clinical signs
Typical findings include a painful, red eye with decreased vision, tearing, photophobia, and a corneal epithelial defect or infiltrate. Clinical features vary; refer to documentation.
When to use this code
Use H16.06 when the provider specifically diagnoses a fungal ulcer of the cornea. It applies when the note links the ulcer to mycotic infection or fungal keratitis. Check documentation if the organism is suspected but not confirmed.
Do not use for
Do not use this code for noninfectious corneal ulcers, simple corneal abrasions, or ulcers from bacteria or herpes unless the record clearly states mycotic infection. Check documentation.
Coding tip
Code the condition only when the provider documents fungal involvement or mycotic corneal ulcer explicitly.