2026 ICD-10-CM Diagnosis Code A56.2Chlamydial infection of genitourinary tract, unspecified

ICD-10-CM Codes›A00–B99›A50-A64›A56

ICD-10-CM A56.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A56.2 is a billable ICD-10-CM diagnosis code for chlamydial infection of genitourinary tract, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 727 through 728, 742 through 743, 757 through 759. Coders also document this condition as acute genitourinary Chlamydia trachomatis infection. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sexually transmitted infections (excluding HIV and hepatitis).

Code Identity

ICD-10-CM Code
A56.2
Billable Status
Yes — Valid for Submission
Code Describes
Chlamydial infection of genitourinary tract, unspecified
Short Description
Chlamydial infection of genitourinary tract, unspecified
Same as the full description in the CMS dataset.
Parent Code
A56
Other sexually transmitted chlamydial diseases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA50-A64Infections with a predominantly sexual mode of transmission
CategoryA56Other sexually transmitted chlamydial diseases
This CodeA56.2Chlamydial infection of genitourinary tract, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute genitourinary Chlamydia trachomatis infection
  • Acute genitourinary infection caused by Chlamydia
  • Chlamydia trachomatis infection of genital structure
  • Chlamydial prostatitis
  • Genitourinary chlamydia infection

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Disease, diseased
      • venereal
        • chlamydial NEC
          • genitourinary NOS
    • Infection, infected, infective(opportunistic)
      • Chlamydia, chlamydial
        • genitourinary tract

Clinical ClassificationClinical

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

CCSR INF010
Sexually transmitted infections (excluding HIV and hepatitis)
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Acute Bacterial Prostatitis|acute bacterial prostatitis

    an acute infection of the prostate gland caused by bacteria, most often escherichia coli, proteus mirabilis, klebsiella, and pseudomonas aeruginosa. signs and symptoms include fever, lower back pain, urinary frequency, and painful urination. the urinalysis reveals the presence of white cells. risk factors include intraprostatic ductal reflux, phimosis, urinary tract infections, and unprotected anal intercourse.

  • Bacterial Prostatitis

    an acute or chronic bacterial infection that affects the prostate gland.

  • Chronic Bacterial Prostatitis|chronic bacterial prostatitis

    a chronic infection of the prostate gland caused by bacteria. it is manifested with recurring urinary tract infections. the culture of the prostatic fluid, semen, or post-massage urine specimen reveals the presence of bacteria.

Patient EducationClinical

Chlamydia Infections

Chlamydia is a common sexually transmitted infection (STI). It is caused by bacteria called Chlamydia trachomatis. Anyone can get chlamydia. It often doesn't cause symptoms, so people may not know that they have it. Antibiotics can cure it. But if it's not treated, chlamydia can cause serious health problems.

The full article covers:

  • What is chlamydia?
  • How is chlamydia spread?
  • Who is more likely to get chlamydia?
  • What are the symptoms of chlamydia?
  • How is chlamydia diagnosed?
  • Who should be tested for chlamydia?
  • What other problems can chlamydia cause?
  • What are the treatments for chlamydia?

Read the full article at MedlinePlus

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

Convert A56.2 to ICD-9-CMHistory

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

ICD-9-CM
099.55 Ot VD chlm trch unspf gu
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A56.2Overview

Is A56.2 (Other sexually transmitted chlamydial diseases) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report chlamydial infection of genitourinary tract, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does A56.2 group to?

When chlamydial infection of genitourinary tract, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 727, 728, 742, 743, 757, 758, 759, with relative weights from 0.6636 to 1.8348 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of A56.2?

Under the General Equivalence Mappings, chlamydial infection of genitourinary tract, unspecified converts to ICD-9-CM 099.55 (ot VD chlm trch unspf gu). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.