2027 ICD-10-CM Diagnosis Code A59.03Trichomonal cystitis and urethritis
ICD-10-CM Codes›A00–B99›A50-A64›A59
- Billable — Valid for Submission
- Not Chronic
A59.03 is a billable ICD-10-CM diagnosis code for trichomonal cystitis and urethritis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 727 through 728, 742 through 743, 757 through 759. Coders also document this condition as trichomonal cystitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections; Sexually transmitted infections (excluding HIV and hepatitis); and Urinary tract infections.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Trichomonal cystitis
- Trichomonal urethritis
- Urogenital infection by Trichomonas vaginalis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A59.03: 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.
- 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.
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.
- human immunodeficiency virus [HIV] disease (B20)
- 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.
- 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 A59.03, its category, or a range that includes it.
Applicable To 1
These notes mention A59.03.
- O98.3 Other infections with a predominantly sexual mode of transmission complicating pregnancy, childbirth and the puerperium
Excludes1 2
These codes carry an Excludes1 note naming A59.03: they are not reported together with it, unless the two conditions are unrelated.
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.
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 A59.03 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A59.03Overview
What is the ICD-10 code for trichomonal cystitis and urethritis?
The ICD-10-CM code for trichomonal cystitis and urethritis is A59.03 (sometimes written as A5903). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is A59.03 (Urogenital trichomoniasis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report trichomonal cystitis and urethritis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does A59.03 group to?
When trichomonal cystitis and urethritis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 742, 759, 727, 743, 728, 758, 757, with relative weights from 0.7687 to 1.8448 depending on complications. Higher weights mean higher Medicare reimbursement.
Can A59.03 be reported with N34.1?
Not as a rule. The Excludes1 note at block A50-A64, which applies to A59.03, 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 A59.03?
Under the General Equivalence Mappings, trichomonal cystitis and urethritis converts to ICD-9-CM 131.02 (trichomonal urethritis). The mapping is approximate, so confirm the match fits the documentation.
