ICD-10 Code A59.01 – Trichomonal vulvovaginitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A59.01 – Trichomonal vulvovaginitis
What it is
A59.01 identifies trichomonal infection involving the vulva and vagina. Use it when documentation specifically states trichomonal vulvovaginitis, not a nonspecific vaginitis.
Clinical signs
Clinical features may include vulvovaginal irritation, discharge, itching, or discomfort. Clinical features vary; refer to documentation, and confirm that trichomonas is the documented cause.
When to use this code
Use A59.01 when the provider documents trichomonal vulvovaginitis, trichomoniasis of the vulva and vagina, or an equivalent diagnosis. Code it from assessment, exam, or test results when the infection is clearly identified. If the record only says vaginitis, check documentation before assigning this code.
Do not use for
Do not use this code for vaginitis without trichomonas, or for infections limited to other genital sites. If the diagnosis is unclear or mixed, check documentation.
Coding tip
Match the code to the exact site and organism documented; do not assume trichomonas from symptoms alone.