ICD-10 Code H53.55 – Tritanomaly (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H53.55 – Tritanomaly
What it is
Tritanomaly is a blue-yellow color vision defect, usually inherited, in which blue hues are harder to distinguish. You use this code when documentation specifically identifies tritanomaly rather than a general color vision deficiency.
Clinical signs
Patients may report trouble telling blue from green or yellow from violet, especially in low-contrast settings. Clinical features vary; refer to documentation.
When to use this code
Use H53.55 when the provider documents tritanomaly, tritan color weakness, or a confirmed blue-yellow color discrimination defect. It may appear in eye care records, school or occupational screening results, or problem lists. If the note only says “color blindness,” check documentation for the specific type.
Do not use for
Do not use this code for nonspecific visual complaints, acquired visual loss, or other color vision defects such as red-green deficiency. Check documentation.
Coding tip
Code the most specific color vision diagnosis documented, and query if the record does not clearly identify tritanomaly.