ICD-10 code for Preglaucoma

The ICD-10-CM code for Preglaucoma is H40.00 (Preglaucoma, unspecified).

Within H40.0, choose H40.00 (Preglaucoma, unspecified) only when documentation doesn't support a more specific option: open angle with borderline findings, low risk (H40.01), open angle with borderline findings, high risk (H40.02), anatomical narrow angle (H40.03), steroid responder (H40.04), ocular hypertension (H40.05) and primary angle closure without glaucoma damage (H40.06).

To report this condition, pick the subcode that matches the documentation: H40.001 (right eye), H40.002 (left eye), H40.003 (bilateral) and H40.009 (unspecified eye).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.