A59.9 — Trichomoniasis, unspecified

A59.9

ICD-10 Chapter 1: Infectious & Parasitic Diseases — illustrative image — Chapter 1: Infectious and parasitic diseases (A00–B99) — illustrative image

What this code means

Trichomoniasis is a common sexually transmitted infection caused by a tiny parasite.

Also called: trichomoniasis, trich.

When this code is used

Used when trichomoniasis is diagnosed without a specified site.

Where it sits in ICD-10-CM

Code A59.9 belongs to Chapter 1: Infectious and parasitic diseases, which covers codes A00–B99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

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Frequently asked questions

What is ICD-10-CM code A59.9?

A59.9 is the ICD-10-CM diagnosis code for “Trichomoniasis, unspecified”. Trichomoniasis is a common sexually transmitted infection caused by a tiny parasite.

When is code A59.9 used?

Used when trichomoniasis is diagnosed without a specified site. It belongs to Chapter 1 of ICD-10-CM (Infectious and parasitic diseases).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.