H18.4 - Corneal degeneration
H18.45 - Nodular corneal degeneration
H18.451 - Nodular corneal degeneration, right eye
H18.452 - Nodular corneal degeneration, left eye
H18.453 - Nodular corneal degeneration, bilateral
H18.459 - Nodular corneal degeneration, unspecified eye