Myogenic ptosis of left eyelid

This code indicates a drooping of the upper eyelid on the left side due to a primary muscular weakness or dysfunction of the levator palpebrae superioris muscle. This condition is not caused by nerve damage or mechanical issues, but rather an intrinsic problem with the muscle itself.

Use this code when documentation explicitly states myogenic ptosis affecting the left eyelid. This diagnosis is typically made after ruling out neurogenic or aponeurotic causes of ptosis. Supporting documentation should include findings from an ophthalmological examination detailing the nature and laterality of the ptosis.

• Differentiate from neurogenic ptosis (e.g., oculomotor nerve palsy) and aponeurotic ptosis, which have different ICD-10-CM codes.
• Ensure the documentation specifies "myogenic" and "left eyelid" to accurately assign this code.
• Do not use this code for unspecified ptosis or ptosis affecting both eyes or the right eye.