ICD-10 Code A59.0 – Urogenital trichomoniasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A59.0 – Urogenital trichomoniasis
What it is
A59.0 identifies urogenital infection caused by Trichomonas vaginalis. Use it for parasitic infection involving the genital and urinary tracts, not for nonspecific vaginitis or other sexually transmitted infections.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings include vaginal or urethral irritation, discharge, dysuria, or genital discomfort, but you should code only when trichomoniasis is documented.
When to use this code
Use A59.0 when the provider documents urogenital trichomoniasis, trichomonal vaginitis, or trichomonal urethritis. It also fits confirmed Trichomonas vaginalis infection of the genital tract. If the note only says “vaginitis” or “STD,” check documentation.
Do not use for
Do not use this code for other causes of vaginitis, urethritis, or genital symptoms without documented trichomoniasis. Do not assume the diagnosis from screening, exposure, or abnormal discharge alone.
Coding tip
Look for the organism or a clear provider statement of trichomoniasis before assigning A59.0.