ICD-10 Code H21.43 – Pupillary membranes, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.43 – Pupillary membranes, bilateral
What it is
H21.43 identifies pupillary membranes in both eyes. This means thin membranous tissue is present across or near the pupil area, which may interfere with normal light entry.
Clinical signs
Clinical features vary; refer to documentation. Findings may include visible membrane tissue at the pupil, irregular pupillary appearance, or reduced visual clarity if the membrane affects the visual axis.
When to use this code
Use H21.43 when the provider documents bilateral pupillary membranes and the condition is the reason for evaluation or is a relevant diagnosis. It applies when both eyes are specifically described. If the note does not clearly identify laterality or diagnosis, check documentation.
Do not use for
Do not use this code for a single-eye pupillary membrane or for unrelated iris, lens, or corneal disorders. If the record only mentions abnormal pupil shape without a membrane diagnosis, check documentation.
Coding tip
Confirm bilateral involvement in the ophthalmology note before assigning H21.43.