Paralytic lagophthalmos left eye, unspecified eyelid

This code signifies the inability to completely close the left eyelid due to paralysis of the orbicularis oculi muscle, specifically when the affected eyelid is not further specified (e.g., upper or lower). This condition can lead to corneal exposure, dryness, and potential damage if left unaddressed.

Apply this code when documentation clearly indicates paralytic lagophthalmos affecting the left eye, and the specific eyelid (upper or lower) is not detailed. This often occurs in cases of facial nerve palsy (Bell's palsy, stroke, trauma) impacting the left side. Supporting documentation should include a physical exam noting incomplete left eyelid closure and a diagnosis of paralytic lagophthalmos.

• Ensure the documentation specifies "left eye" and "paralytic" to differentiate from other forms of lagophthalmos.
• If the specific eyelid (upper or lower) is documented, use a more precise code from the H02.23- subcategory.
• Always code the underlying cause of the facial nerve paralysis (e.g., G51.0 for Bell's palsy) as the primary diagnosis, with this code as a secondary diagnosis.