ICD-10 Code H21.512 – Anterior synechiae (iris), left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.512 – Anterior synechiae (iris), left eye
What it is
H21.512 identifies adhesions between the iris and the cornea or lens in the left eye. This code describes a localized anatomic finding, not a cause or complication by itself.
Clinical signs
Findings may include iris adhesions seen on slit-lamp exam, irregular pupil shape, or reduced anterior chamber mobility. Clinical features vary; refer to documentation.
When to use this code
Use H21.512 when the record clearly states anterior synechiae of the iris in the left eye. It is appropriate for documented exam findings, ophthalmology assessments, or follow-up visits when the condition remains present.
Code it only when the left eye is specified. If the note describes bilateral disease, a different code is needed, so check documentation carefully.
Do not use for
Do not use this code for posterior synechiae, corneal scarring, or unspecified eye involvement. Check documentation if the adhesion is not clearly described as anterior synechiae of the left eye.
Coding tip
Always confirm laterality and the exact anatomic term before assigning H21.512.