ICD-10 Code H16.403 – Unspecified corneal neovascularization, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.403 – Unspecified corneal neovascularization, bilateral
What it is
This code identifies abnormal new blood vessel growth in the corneas of both eyes, without a documented cause or more specific type. It signals corneal neovascularization when the record does not specify the underlying condition.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the chart may note visible corneal vessels, corneal haze, or reduced corneal clarity on eye examination.
When to use this code
Use H16.403 when the provider documents bilateral corneal neovascularization and does not name a more specific etiology or corneal disorder. It also fits when the condition is described as unspecified in both eyes. Check documentation if only one eye is involved or if the cause is stated.
Do not use for
Do not use this code for unilateral corneal neovascularization or when the record identifies a more specific corneal diagnosis. If the documentation is unclear, check documentation rather than assuming bilateral disease.
Coding tip
Confirm that “bilateral” and “unspecified” are both supported in the note before assigning H16.403.