Other mechanical strabismus

This code represents a form of strabismus (misalignment of the eyes) that is caused by a physical restriction or anomaly of the extraocular muscles or surrounding tissues, rather than a neurological or refractive error. It signifies a mechanical impediment to normal eye movement, leading to ocular deviation.

Use this code when documentation indicates strabismus due to structural issues such as muscle fibrosis, adhesions, or orbital masses that physically impede eye movement, and the specific type of mechanical strabismus is not otherwise specified. Supporting documentation would include ophthalmological exam findings detailing restricted ocular motility and imaging reports confirming a mechanical cause.

• Differentiate from paralytic strabismus (H49.-) and concomitant strabismus (H50.0-H50.3) which have different etiologies.
• Ensure documentation clearly states a "mechanical" cause for the strabismus, and that it's not a more specific type like Duane's syndrome (H50.61-) or Brown's sheath syndrome (H50.62-).
• Always code the underlying cause of the mechanical restriction if known and documented (e.g., orbital tumor, muscle fibrosis due to trauma).