Monofixation syndrome

Monofixation syndrome, also known as microtropia, is a subtle form of strabismus characterized by a small-angle deviation of the eyes (typically less than 10 prism diopters) that is often not cosmetically noticeable. Despite the deviation, patients achieve peripheral fusion but have a central scotoma in the deviating eye, leading to reduced stereopsis. This condition is often associated with amblyopia in the affected eye.

This code is appropriate for documenting a diagnosis of monofixation syndrome, which may be congenital or acquired. It should be used when ophthalmological examination confirms a small-angle strabismus with peripheral fusion and reduced central stereopsis. Documentation should include findings such as a positive 4-diopter prism test, reduced stereoacuity, and potentially amblyopia.

• Differentiate from other forms of strabismus; monofixation syndrome implies peripheral fusion with central suppression.
• Code any associated amblyopia (H53.0x) or other ocular conditions separately.
• Ensure documentation specifies the presence of microtropia or monofixation syndrome, not just a generic strabismus.