ICD-10 Code A59.8 – Trichomoniasis of other sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A59.8 – Trichomoniasis of other sites
What it is
A59.8 identifies trichomoniasis involving sites other than the usual genitourinary locations. Use it for documented Trichomonas infection when the affected site is specified as “other.”
Clinical signs
Clinical features vary; refer to documentation. Findings may reflect local infection or inflammation at the involved site, but the record should clearly identify trichomoniasis and the nonstandard site.
When to use this code
Use A59.8 when the provider documents trichomoniasis at a site not captured by the more specific trichomoniasis codes. This may apply when the site is named in the chart, but no more precise code exists.
If the documentation only says “Trichomonas infection” without a site, check documentation before coding. Code the condition only when the record supports an infection at an other specified site.
Do not use for
Do not use A59.8 for routine urogenital trichomoniasis or when the site is unspecified. If the condition is another sexually transmitted infection or a non-Trichomonas vaginitis, choose the correct diagnosis code.
Coding tip
Match the code to the documented site wording exactly; if the site is unclear, query the provider before assigning A59.8.