ICD-10-CM > H00-H59 > H40-H42 > H40 > H40.0 > H40.00 H40.00 Preglaucoma, unspecified Non-Billable/Non-Specific Codes H40.001Preglaucoma, unspecified, right eyeH40.002Preglaucoma, unspecified, left eyeH40.003Preglaucoma, unspecified, bilateralH40.009Preglaucoma, unspecified, unspecified eye