Paralytic lagophthalmos left upper eyelid

This code signifies the inability to completely close the left upper eyelid due to paralysis of the orbicularis oculi muscle. This condition leads to exposure of the globe, which can result in corneal dryness, irritation, and potential damage. It is a specific type of lagophthalmos caused by nerve dysfunction.

Use this code when documentation explicitly states paralytic lagophthalmos affecting the left upper eyelid. This typically arises from facial nerve palsy (e.g., Bell's palsy, trauma, tumor) impacting the innervation of the orbicularis oculi. Supporting documentation should include findings of incomplete eyelid closure and a neurological assessment confirming paralysis.

• Differentiate from other forms of lagophthalmos, such as cicatricial (H02.21-) or mechanical (H02.22-), which have different etiologies.
• Always specify laterality (left, right, bilateral) as indicated in the documentation.
• Code any underlying cause of the facial nerve paralysis (e.g., G51.0 for Bell's palsy) as a primary diagnosis if it is the reason for the encounter.