H16.1 - Other and unspecified superficial keratitis without conjunctivitis
H16.12 - Filamentary keratitis
H16.121 - Filamentary keratitis, right eye
H16.122 - Filamentary keratitis, left eye
H16.123 - Filamentary keratitis, bilateral
H16.129 - Filamentary keratitis, unspecified eye