ICD-10 Code H50.042 – Monocular esotropia with other noncomitancies, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H50.042 – Monocular esotropia with other noncomitancies, left eye
What it is
H50.042 identifies inward deviation of the left eye that is not comitant, meaning the misalignment changes with gaze direction. Use this when the left eye turns inward and the deviation is not the same in all positions of gaze.
Clinical signs
Typical findings include left eye esotropia with variable angle in different gaze positions, often noted on cover testing or ocular motility exam. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents monocular esotropia affecting the left eye and specifies other noncomitancy. It is appropriate for ophthalmology or optometry notes describing a gaze-dependent inward deviation. Check documentation if laterality or comitancy is unclear.
Do not use for
Do not use this code for comitant esotropia, unspecified esotropia, or deviation involving the right eye. If the record does not clearly state left-sided noncomitant esotropia, check documentation.
Coding tip
Confirm both laterality and noncomitancy in the provider note before assigning H50.042.