Posterior synechiae (iris), left eye

This code signifies an adhesion of the posterior surface of the iris to the anterior lens capsule in the left eye. This condition can impede pupillary dilation and may be a sequela of inflammation (e.g., uveitis) or trauma.

Apply this code when documentation specifies posterior synechiae affecting the left eye. This is typically diagnosed via slit lamp examination and often noted in patients with a history of ocular inflammation or surgery.

• Differentiate from anterior synechiae (H21.53-) which involves adhesion of the iris to the cornea or trabecular meshwork.
• Always specify laterality; this code is for the left eye only.
• Code any underlying cause of the synechiae (e.g., uveitis) first, if applicable, as the primary diagnosis.