ICD-10 Code H18.312 – Folds and rupture in Bowman’s membrane, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.312 – Folds and rupture in Bowman’s membrane, left eye
What it is
H18.312 identifies folds or a rupture in Bowman’s membrane of the left eye. This is a corneal structural disorder, so you should use it when the left eye is specifically documented.
Clinical signs
Clinical features vary; refer to documentation. Findings may include corneal irregularity noted on eye examination, with changes described by the ophthalmologist as folds or a break in Bowman’s membrane.
When to use this code
Use this code when the provider documents folds or rupture in Bowman’s membrane affecting the left eye. It may apply after slit-lamp examination, corneal evaluation, or specialist assessment. If laterality is not documented, check documentation before coding.
Do not use for
Do not use this code for corneal disorders that do not involve Bowman’s membrane or for right-eye or bilateral conditions. If the record only says corneal abnormality without this specific finding, check documentation.
Coding tip
Confirm the exact eye and the specific Bowman’s membrane finding before assigning H18.312.