ICD-10-CM > H00-H59 > H15-H22 > H16 > H16.1 > H16.12 H16.12 Filamentary keratitis Non-Billable/Non-Specific Codes H16.121Filamentary keratitis, right eyeH16.122Filamentary keratitis, left eyeH16.123Filamentary keratitis, bilateralH16.129Filamentary keratitis, unspecified eye