Paralytic lagophthalmos, bilateral, upper and lower eyelids

This code describes the inability to completely close both the upper and lower eyelids on both eyes due to paralysis of the orbicularis oculi muscle. This condition leaves the ocular surface exposed, leading to potential dryness, irritation, and corneal damage.

Use this code when documentation explicitly states bilateral paralytic lagophthalmos affecting both upper and lower eyelids. This is often seen in conditions like Bell's palsy affecting both sides of the face, or other neurological disorders causing bilateral facial nerve paralysis.

• Ensure documentation specifies "bilateral" and involvement of both "upper and lower eyelids" to support this specific code.
• Distinguish from mechanical lagophthalmos (e.g., due to scarring) or nocturnal lagophthalmos, which have different codes.
• Code any underlying cause of the facial nerve paralysis (e.g., G51.0 for Bell's palsy) as a primary diagnosis if applicable.