Pupillary membranes, unspecified eye

This code signifies the presence of persistent pupillary membranes, which are remnants of the fetal pupillary membrane that fail to fully resorb after birth. These membranes are typically strands of tissue extending from the iris collarette across the pupil, potentially affecting vision if dense or extensive.

Apply this code when documentation indicates the presence of pupillary membranes without specifying laterality (right or left eye). This is appropriate when the physician's notes simply state "pupillary membranes" or "persistent pupillary membranes" without further detail on which eye is affected.

• Avoid using this code if laterality is documented; instead, use H21.41 (right eye) or H21.42 (left eye).
• Do not confuse with iris adhesions (synechiae), which are typically acquired and involve adherence of the iris to other structures.
• Ensure the documentation clearly identifies the condition as pupillary membranes and not another iris anomaly.