ICD-10 Code H21.541 – Posterior synechiae (iris), right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.541 – Posterior synechiae (iris), right eye
What it is
This code identifies adhesions between the posterior surface of the iris and the anterior lens capsule in the right eye. It indicates a localized anatomic finding that can follow inflammation or eye injury.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include iris-lens adhesions on slit-lamp exam, irregular pupil shape, or limited pupil movement.
When to use this code
Use H21.541 when the provider documents posterior synechiae specifically in the right eye. Code it for a confirmed exam finding, whether noted as a current problem or a sequela of prior ocular inflammation. If laterality is not stated, check documentation before assigning a unilateral code.
Do not use for
Do not use this code for left-eye or bilateral posterior synechiae, or for nonspecific iris adhesions without right-eye laterality. Check documentation if the record only mentions uveitis, pupillary abnormality, or another eye disorder.
Coding tip
Verify laterality and the exact anatomic term in the ophthalmology note before coding.