ICD-10 Code H21.40 – Pupillary membranes, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.40 – Pupillary membranes, unspecified eye
What it is
This code identifies a pupillary membrane in an unspecified eye. It refers to a residual membrane over or near the pupil that is documented without laterality detail.
Clinical signs
Findings may include a visible fibrous membrane across the pupil, partial obstruction of the visual axis, or reduced pupillary opening. Clinical features vary; refer to documentation.
When to use this code
Use H21.40 when the provider documents a pupillary membrane but does not specify right or left eye. It also fits when the record confirms the condition and laterality is unavailable. Code only from the documented diagnosis; check documentation if the note is unclear.
Do not use for
Do not use this code for a specified eye when laterality is documented. Do not use it for other iris, pupillary, or anterior segment disorders unless the record clearly states pupillary membranes.
Coding tip
If the chart names the eye, select the laterality-specific code instead of the unspecified code.