ICD-10 Code H16.40 – Unspecified corneal neovascularization (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.40 – Unspecified corneal neovascularization
What it is
H16.40 identifies corneal neovascularization when new blood vessels grow into the cornea and the documentation does not specify the cause or type. Use it when the record clearly states corneal neovascularization but gives no further detail.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include visible corneal vessels on slit-lamp exam and reduced corneal clarity, but you should code only what is documented.
When to use this code
Use H16.40 when the provider documents corneal neovascularization without naming a specific etiology, such as contact lens-related change, infection, or inflammatory disease. It also fits when the note states “unspecified” or gives insufficient detail for a more exact code. Check documentation if another corneal disorder is described.
Do not use for
Do not use this code when the chart identifies a specific underlying cause or a different corneal condition. If the record describes only scarring, opacity, or another eye disorder without neovascularization, choose the documented diagnosis instead.
Coding tip
Code the most specific corneal diagnosis available, and query the provider if neovascularization is mentioned but the cause is unclear.