Inferior oblique muscle entrapment, right eye

This code describes the mechanical restriction of the right inferior oblique muscle, preventing its normal movement. This entrapment typically results in impaired eye movement, particularly during upward and outward gaze, and can lead to diplopia or strabismus. It often occurs due to trauma, such as an orbital fracture, where the muscle becomes trapped within the fracture site.

Use this code when documentation clearly indicates entrapment of the inferior oblique muscle in the right eye, often following orbital trauma. This diagnosis is supported by clinical findings of restricted ocular motility, especially in elevation and abduction of the right eye, and may be confirmed by imaging studies like CT scans showing muscle impingement.

• Ensure the documentation specifies the right eye; separate codes exist for the left eye and bilateral involvement.
• Distinguish entrapment from paresis or paralysis, which involve nerve dysfunction rather than mechanical restriction.
• Always code any underlying cause, such as an orbital fracture, in addition to this code, following sequencing guidelines.