H40.23 is a "category code," which means it's non-billable. Billable codes require more specificity. Use the list below to navigate to codes that are more specific:
10
H40.231
Intermittent angle-closure glaucoma, right eye
Billable
10
H40.232
Intermittent angle-closure glaucoma, left eye
Billable
10
H40.233
Intermittent angle-closure glaucoma, bilateral
Billable
10
H40.239
Intermittent angle-closure glaucoma, unspecified eye
Billable