ICD-10-CM > H00-H59 > H15-H22 > H16 > H16.0 > H16.02 H16.02 Ring corneal ulcer Non-Billable/Non-Specific Codes H16.021Ring corneal ulcer, right eyeH16.022Ring corneal ulcer, left eyeH16.023Ring corneal ulcer, bilateralH16.029Ring corneal ulcer, unspecified eye