ICD-10 Code H40.003 – Preglaucoma, unspecified, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H40.003 – Preglaucoma, unspecified, bilateral
What it is
H40.003 identifies a bilateral preglaucoma finding when glaucoma is suspected or risk is present, but a definite glaucoma diagnosis is not yet established. Use it for both eyes when the record does not specify a more exact type.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the chart may note elevated intraocular pressure, suspicious optic nerve appearance, or other glaucoma risk findings without confirmed glaucomatous damage.
When to use this code
Use this code when the provider documents preglaucoma, glaucoma suspect, or similar wording for both eyes and no subtype is stated. It is appropriate when the assessment reflects concern for future glaucoma rather than confirmed disease. Check documentation if the note also names ocular hypertension or another specific diagnosis.
Do not use for
Do not use H40.003 for confirmed glaucoma, ocular hypertension alone, or unilateral or unspecified-eye documentation. If the record gives a different laterality or a more specific glaucoma type, code that instead.
Coding tip
Match laterality exactly; if the provider does not clearly document both eyes, check documentation before assigning bilateral coding.