ICD-10 Code H02.412 – Mechanical ptosis of left eyelid (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H02.412 – Mechanical ptosis of left eyelid
What it is
H02.412 identifies drooping of the left upper eyelid caused by a mechanical weight or obstruction. Use it when the eyelid position is lowered because of local tissue or mass effect, not nerve or muscle disease.
Clinical signs
Typical findings include a visibly low left eyelid, narrowed palpebral opening, and possible visual obstruction. Clinical features vary; refer to documentation for the underlying cause and laterality.
When to use this code
Use this code when the provider documents mechanical ptosis affecting the left eyelid and links it to a local cause such as excess tissue, swelling, or a lesion. It also fits cases where the record clearly states the ptosis is mechanical and unilateral.
Document the cause when available, because the code alone does not explain why the eyelid droops. If the note only says “ptosis” without laterality or mechanism, check documentation.
Do not use for
Do not use this code for congenital, neurogenic, myogenic, or unspecified ptosis. Also avoid it when the chart does not confirm the left side or a mechanical cause.
Coding tip
Confirm both laterality and the word “mechanical” in the provider note before assigning H02.412.