Alternating exotropia with A pattern

This code describes a type of strabismus where one eye deviates outward (exotropia) while the other eye fixates, and then the roles reverse, with the deviation being more pronounced in upgaze or downgaze (A pattern). This alternating deviation is a form of ocular misalignment that can affect binocular vision.

Use this code when documentation clearly indicates alternating exotropia with an associated A pattern. This typically involves ophthalmological examination findings noting the outward deviation and its variability with vertical gaze. Documentation should specify both the alternating nature and the A pattern.

• Differentiate from intermittent or constant exotropia without an A or V pattern.
• Ensure the "alternating" and "A pattern" components are explicitly documented to support this specific code.
• Do not confuse with esotropia (inward deviation) or other patterns (e.g., V pattern).