ICD-10 Code H50.18 – Alternating exotropia with other noncomitancies (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H50.18 – Alternating exotropia with other noncomitancies
What it is
H50.18 identifies alternating exotropia, a form of outward eye deviation in which either eye may drift outward. The “other noncomitancies” part means the misalignment changes with gaze direction or other eye positions.
Clinical signs
You may see intermittent or constant outward turning of one eye, with alternation between eyes over time. Clinical features vary; refer to documentation for the specific pattern of incomitance and exam findings.
When to use this code
Use H50.18 when the record documents alternating exotropia and also notes noncomitant behavior, such as varying deviation in different gaze positions. Code it when the provider clearly distinguishes this from basic comitant exotropia. Check documentation if the note only says exotropia without laterality or incomitance details.
Do not use for
Do not use this code for exotropia that is not alternating, or when the chart does not support noncomitancy. If the provider describes another specific strabismus pattern, select the documented diagnosis instead.
Coding tip
Look for both elements in the note: alternating deviation and noncomitant movement across gaze positions.