ICD-10 Code H16.323 – Diffuse interstitial keratitis, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.323 – Diffuse interstitial keratitis, bilateral
What it is
H16.323 identifies diffuse interstitial keratitis affecting both eyes. It refers to inflammation within the corneal stroma, not the surface epithelium, and is documented as bilateral when both corneas are involved.
Clinical signs
Typical findings include corneal haze, stromal inflammation, and reduced clarity of the cornea. Clinical features vary; refer to documentation for laterality, extent, and any associated corneal vascularization or scarring.
When to use this code
Use this code when the provider documents diffuse interstitial keratitis in both eyes. It is appropriate for ophthalmology notes, consults, or problem lists that clearly state bilateral involvement. If the record only says keratitis without corneal stromal involvement, check documentation.
Do not use for
Do not use it for unilateral interstitial keratitis or for nonspecific keratitis without bilateral documentation. Do not assign it when the chart describes another corneal disorder or an unspecified eye condition.
Coding tip
Confirm that the diagnosis is explicitly bilateral before selecting H16.323.