ICD-10 Code H21.562 – Pupillary abnormality, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.562 – Pupillary abnormality, left eye
What it is
This code identifies an abnormal pupil finding limited to the left eye. It is used when documentation describes a pupillary defect, irregularity, or other abnormal pupil appearance without a more specific diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings include an abnormal pupil shape, size, or reaction in the left eye, sometimes with asymmetry compared with the right eye.
When to use this code
Use H21.562 when the provider documents a pupillary abnormality in the left eye and does not name a more specific condition. It may fit exam findings, follow-up assessments, or ophthalmology notes that describe the left pupil as abnormal. You should code the documented laterality exactly.
Do not use for
Do not use this code for bilateral pupillary abnormalities or when the right eye is affected instead. If the record identifies a specific underlying disorder, such as a separate ocular or neurologic diagnosis, code that condition instead; check documentation.
Coding tip
Always confirm laterality and whether the abnormal pupil is a standalone finding or part of a documented underlying diagnosis.