2027 ICD-10-CM Diagnosis Code A59.8Trichomoniasis of other sites

ICD-10-CM Codes›A00–B99›A50-A64›A59

ICD-10-CM A59.8
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A59.8 is a billable ICD-10-CM diagnosis code for trichomoniasis of other sites. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 867 through 869. Coders also document this condition as balanoposthitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections; and Sexually transmitted infections (excluding HIV and hepatitis).

Code Identity

ICD-10-CM Code
A59.8
Billable Status
Yes — Valid for Submission
Code Describes
Trichomoniasis of other sites
Short Description
Trichomoniasis of other sites
Same as the full description in the CMS dataset.
Parent Code
A59
Trichomoniasis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA50-A64Infections with a predominantly sexual mode of transmission
CategoryA59Trichomoniasis
This CodeA59.8Trichomoniasis of other sites

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Balanoposthitis
  • Posthitis
  • Trichomonal balanitis
  • Trichomonal balanoposthitis
  • Trichomoniasis affecting skin

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A59.8: its own notes plus those printed at A59, 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.

From A59 Trichomoniasis applies to 7 codes
  • 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 A59.8, its category, or a range that includes it.

Applicable To 1

These notes mention A59.8.

  • 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

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INF009
Parasitic, other specified and unspecified infections
Default principal diagnosis: inpatient No · outpatient No
CCSR INF010
Sexually transmitted infections (excluding HIV and hepatitis)
Default principal diagnosis: inpatient Yes · outpatient Yes

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.

Convert A59.8 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
131.8 Trichomoniasis NEC
Exact Match The mapping is direct, with no qualifiers.

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 A59.8Overview

What is the ICD-10 code for trichomoniasis of other sites?

The ICD-10-CM code for trichomoniasis of other sites is A59.8 (sometimes written as A598). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is A59.8 (Trichomoniasis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report trichomoniasis of other sites on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does A59.8 group to?

When trichomoniasis of other sites is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 869, 868, with relative weights from 0.6784 to 2.1855 depending on complications. Higher weights mean higher Medicare reimbursement.

Can A59.8 be reported with N34.1?

Not as a rule. The Excludes1 note at block A50-A64, which applies to A59.8, 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).

What is the ICD-9 equivalent of A59.8?

Under the General Equivalence Mappings, trichomoniasis of other sites converts to ICD-9-CM 131.8 (trichomoniasis NEC). The mapping is a direct match.