ICD-10 Code H02.421 – Myogenic ptosis of right eyelid (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H02.421 – Myogenic ptosis of right eyelid
What it is
Myogenic ptosis of the right eyelid means drooping of the upper right eyelid caused by a muscle problem. The condition is specific to the right side and reflects impaired eyelid elevation.
Clinical signs
Typical findings include a visibly low right upper eyelid and possible asymmetry between the eyes. Clinical features vary; refer to documentation for the underlying muscle disorder and whether vision is affected.
When to use this code
Use this code when the record clearly documents myogenic ptosis affecting the right eyelid. It fits congenital or acquired muscle-related eyelid droop when laterality is specified as right. Check documentation if the cause is neurologic, mechanical, or unspecified.
Do not use for
Do not use it for left or bilateral ptosis, or when the record does not identify myogenic etiology. If the note describes another cause of eyelid droop, such as nerve injury or excess eyelid tissue, choose the documented condition.
Coding tip
Verify both laterality and cause in the ophthalmology note before assigning H02.421.