ICD-10-CM > H00-H59 > H40-H42 > H40 > H40.1 > H40.12 > H40.122 H40.122 Low-tension glaucoma, left eye Non-Billable/Non-Specific Codes H40.1220..., stage unspecifiedH40.1221..., mild stageH40.1222..., moderate stageH40.1223..., severe stageH40.1224..., indeterminate stage