ICD-10 Code H16.021 – Ring corneal ulcer, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.021 – Ring corneal ulcer, right eye
What it is
This code identifies a ring-shaped corneal ulcer in the right eye. It refers to a localized corneal lesion with a circular pattern, documented specifically on the right side.
Clinical signs
Typical findings include corneal pain, redness, tearing, photophobia, and reduced vision. Clinical features vary; refer to documentation, especially when the ulcer’s ring pattern is noted on eye examination.
When to use this code
Use H16.021 when the provider documents a ring corneal ulcer affecting the right eye. It fits ophthalmology notes, emergency visits, or specialist assessments that clearly identify the lesion and side. If the record only says “corneal ulcer” without laterality or ring pattern, check documentation.
Do not use for
Do not use this code for corneal ulcers in the left eye or unspecified eye. Also avoid it when the finding is another corneal disorder without a documented ring-shaped ulcer.
Coding tip
Confirm both the ring morphology and right-eye laterality in the chart before assigning H16.021.