ICD-10-CM > H00-H59 > H40-H42 > H40 > H40.2 > H40.20 H40.20 Unspecified primary angle-closure glaucoma Non-Billable/Non-Specific Codes H40.20X0..., stage unspecifiedH40.20X1..., mild stageH40.20X2..., moderate stageH40.20X3..., severe stageH40.20X4..., indeterminate stage