ICD-10 Code H16.322 – Diffuse interstitial keratitis, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.322 – Diffuse interstitial keratitis, left eye
What it is
This code identifies diffuse interstitial keratitis affecting the left eye. It refers to inflammation within the corneal stroma rather than the surface epithelium.
Clinical signs
Typical findings include corneal haze, stromal inflammation, and reduced visual clarity in the left eye. Clinical features vary; refer to documentation.
When to use this code
Use H16.322 when the provider documents diffuse interstitial keratitis specifically in the left eye. Code it when the diagnosis is confirmed or clearly stated in the assessment, problem list, or ophthalmology note.
Do not use for
Do not use this code for keratitis in an unspecified eye or for non-interstitial corneal inflammation. Check documentation if the record does not clearly identify the left eye.
Coding tip
Verify laterality carefully, because the left-eye detail is essential for correct code selection.