ICD-10 Code H40.002 – Preglaucoma, unspecified, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.002 – Preglaucoma, unspecified, left eye
What it is
H40.002 identifies preglaucoma in the left eye when the condition is not further specified. Use it for a documented at-risk or borderline glaucoma state affecting only the left eye.
Clinical signs
Clinical features vary; refer to documentation. Findings may include optic nerve or intraocular pressure concerns without confirmed glaucoma, but you should code only what the provider records.
When to use this code
Use this code when the chart specifically documents preglaucoma and identifies the left eye. It is appropriate when the clinician notes a glaucoma-suspect or preglaucomatous state, but has not diagnosed definite glaucoma. If laterality is left only, this code is more precise than an unspecified-eye option.
Do not use for
Do not use this code for confirmed glaucoma, ocular hypertension without preglaucoma, or conditions affecting both eyes unless documented separately. Check documentation if the record does not clearly state preglaucoma.
Coding tip
Verify laterality and the exact provider wording before assigning H40.002.