ICD-10-CM > H00-H59 > H40-H42 > H40 > H40.1 > H40.12 > H40.121 H40.121 Low-tension glaucoma, right eye Non-Billable/Non-Specific Codes H40.1210..., stage unspecifiedH40.1211..., mild stageH40.1212..., moderate stageH40.1213..., severe stageH40.1214..., indeterminate stage