ICD-10-CM > H00-H59 > H40-H42 > H40 > H40.1 > H40.11 > H40.112 H40.112 Primary open-angle glaucoma, left eye Non-Billable/Non-Specific Codes H40.1120..., stage unspecifiedH40.1121..., mild stageH40.1122..., moderate stageH40.1123..., severe stageH40.1124..., indeterminate stage