ICD-10 Code H16.4 – Corneal Neovascularization (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.4 – Corneal neovascularization
What it is
H16.4 identifies corneal neovascularization, meaning new blood vessels have grown into the cornea, which is normally avascular. Use this code when the provider documents corneal vessel ingrowth or corneal vascularization.
Clinical signs
Findings may include visible vessels extending from the limbus into the cornea, corneal haze, and reduced transparency. Clinical features vary; refer to documentation.
When to use this code
Use H16.4 when the record specifically states corneal neovascularization or corneal vascularization. It is appropriate for outpatient, inpatient, or consult notes when the condition is documented as the diagnosis being evaluated or treated. Check documentation if the note only describes a history of corneal disease without current vessel ingrowth.
Do not use for
Do not use this code for conjunctival or episcleral vessels that do not involve the cornea. If the provider documents a different corneal disorder without neovascularization, code the stated condition instead.
Coding tip
Confirm the cornea is explicitly involved; “red eye” alone is not enough for H16.4.