Monocular exotropia with A pattern, right eye

This code describes a type of strabismus where the right eye deviates outward (exotropia) when both eyes are open, and the deviation is greater in upgaze than in downgaze, forming an "A" pattern. This pattern indicates a vertical incomitance in the horizontal deviation.

Use this code for patients diagnosed with exotropia specifically affecting the right eye, where ophthalmological examination confirms an "A" pattern deviation. Documentation should clearly state "monocular exotropia, right eye" and specify the "A pattern" to support code assignment.

• Ensure documentation specifies laterality (right eye) and the "A pattern" for accurate coding.
• Distinguish from "V pattern" exotropia (H50.123) and other forms of monocular exotropia without specified patterns (H50.129).
• Do not confuse with intermittent exotropia (H50.13-) or other types of strabismus.