ICD-10-CM > H00-H59 > H15-H22 > H16 > H16.3 > H16.30 H16.30 Unspecified interstitial keratitis Non-Billable/Non-Specific Codes H16.301Unspecified interstitial keratitis, right eyeH16.302Unspecified interstitial keratitis, left eyeH16.303Unspecified interstitial keratitis, bilateralH16.309Unspecified interstitial keratitis, unspecified eye