ICD-10 Code H16.30 – Unspecified interstitial keratitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.30 – Unspecified interstitial keratitis
What it is
Unspecified interstitial keratitis is inflammation of the corneal stroma, the middle layer of the cornea. Use this code when the record identifies interstitial keratitis but does not specify the cause or laterality.
Clinical signs
Findings may include corneal haze, stromal inflammation, photophobia, pain, tearing, and reduced vision. Clinical features vary; refer to documentation for the exact presentation and any stated etiology.
When to use this code
Use H16.30 when the provider documents interstitial keratitis without naming a specific organism, systemic disease, or other cause. It also fits when laterality is not stated and no more specific corneal code applies. Check documentation if the note suggests a different keratitis type.
Do not use for
Do not use this code for keratitis with a documented specific cause, such as infectious or autoimmune disease, if a more specific code is available. Do not assign it when the condition is described as another corneal disorder.
Coding tip
Query for the cause and laterality when they are missing, because a more specific code may be available.