2027 ICD-10-CM Diagnosis Code A59Trichomoniasis

ICD-10-CM Codes›A00–B99›A50-A64›A59

ICD-10-CM A59
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A59 is a non-billable ICD-10-CM category code for trichomoniasis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as A59.00, A59.01, A59.02, and A59.03.

Code Identity

ICD-10-CM Code
A59
Billable Status
No — Non-Billable Category
Code Describes
Trichomoniasis
Short Description
Trichomoniasis
Same as the full description in the CMS dataset.
Chapter
A50-A64
Infections with a predominantly sexual mode of transmission

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA50-A64Infections with a predominantly sexual mode of transmission
CategoryA59Trichomoniasis
This CodeA59Trichomoniasis

Specific Coding for TrichomoniasisOverview

Non-specific codes like A59 require more characters. Use one of these billable codes instead:

  • A59.0 for Urogenital trichomoniasis

  • Use A59.00 for Urogenital trichomoniasis, unspecified

  • Use A59.01 for Trichomonal vulvovaginitis

  • Use A59.02 for Trichomonal prostatitis

  • Use A59.03 for Trichomonal cystitis and urethritis

  • Use A59.09 for Other urogenital trichomoniasis

  • Use A59.8 for Trichomoniasis of other sites

  • Use A59.9 for Trichomoniasis, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A59: its own notes plus those printed at block A50-A64 and Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block A50-A64 Infections with a predominantly sexual mode of transmission applies to 142 codes
  • nonspecific and nongonococcal urethritis (N34.1)
  • Reiter's disease (M02.3-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On A59 itself
  • intestinal trichomoniasis (A07.8)
From Block A50-A64 Infections with a predominantly sexual mode of transmission applies to 142 codes
  • human immunodeficiency virus [HIV] disease (B20)
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name A59, its category, or a range that includes it.

Applicable To 1

These notes mention A59.

  • O98.3 Other infections with a predominantly sexual mode of transmission complicating pregnancy, childbirth and the puerperium
    Conditions in A55-A64 names A55-A64, which includes this code

Clinical InformationClinical

  • Trichomonas Infections

    infections in birds and mammals produced by various species of trichomonas.

Patient EducationClinical

Trichomoniasis

Trichomoniasis is a sexually transmitted infection (STI) caused by a parasite. It spreads from person to person during sex. Many people do not have any symptoms. If you do get symptoms, they usually happen within 5 to 28 days after being infected.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A59Overview

What is the ICD-10 code for trichomoniasis?

A59 is the ICD-10-CM category for trichomoniasis, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is A59 (Trichomoniasis) a billable code?

No. This is a category header that groups the codes for trichomoniasis, and headers cannot be submitted on claims. Claims for trichomoniasis need a more specific code from this category, such as A59.00, A59.01, and A59.02.

Can A59 be reported with N34.1?

Not as a rule. The Excludes1 note at block A50-A64, which applies to A59, lists "nonspecific and nongonococcal urethritis (N34.1)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).