ICD-10 Code H21.519 – Anterior synechiae (iris), unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.519 – Anterior synechiae (iris), unspecified eye
What it is
H21.519 identifies anterior synechiae of the iris in an unspecified eye. This means the iris is abnormally attached to the cornea or trabecular meshwork, usually from prior inflammation, injury, or surgery.
Clinical signs
Findings may include iris adhesions seen on slit-lamp exam, distorted pupil shape, or reduced anterior chamber angle. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents anterior synechiae of the iris and does not specify the right or left eye. It is appropriate when the record describes adhesions without a more specific related diagnosis. Check documentation if the cause is recorded separately, such as uveitis or trauma.
Do not use for
Do not use H21.519 for posterior synechiae, glaucoma without documented synechiae, or eye laterality that is specified elsewhere. If the note identifies a different eye or a different adhesion type, code that instead.
Coding tip
Confirm laterality and whether the synechiae are anterior before assigning H21.519.