2026 ICD-10-CM Diagnosis Code A74.89Other chlamydial diseases

ICD-10-CM Codes›A00–B99›A70-A74›A74

ICD-10-CM A74.89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A74.89 is a billable ICD-10-CM diagnosis code for other chlamydial diseases. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 865 through 866. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections.

Code Identity

ICD-10-CM Code
A74.89
Billable Status
Yes — Valid for Submission
Code Describes
Other chlamydial diseases
Short Description
Other chlamydial diseases
Same as the full description in the CMS dataset.
Parent Code
A74.8
Other chlamydial diseases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA70-A74Other diseases caused by chlamydiae
CategoryA74Other diseases caused by chlamydiae
This CodeA74.89Other chlamydial diseases

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute bacterial bronchitis
  • Acute chlamydial bronchitis
  • Chlamydial colitis
  • Chlamydial infection of the central nervous system
  • Colitis caused by Chlamydia trachomatis
  • Dacryoadenitis caused by Chlamydia trachomatis
  • Endocarditis caused by Chlamydia
  • Infection of lacrimal gland caused by bacterium
  • Infection of skin caused by Chlamydia
  • Intestinal Chlamydia trachomatis infection
  • Neonatal bacterial conjunctivitis
  • Neonatal chlamydial infection
  • Neonatal dacryocystitis or conjunctivitis caused by chlamydiae

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.

    • Chlamydia, chlamydial
      • specified NEC
    • Disease, diseased
      • chlamydial
        • specified NEC

Clinical ClassificationClinical

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

CCSR INF003
Bacterial infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Bacterial Infections

Bacteria are tiny organisms (living things) that have only one cell. Under a microscope, they look like balls, rods, or spirals. They can be found almost everywhere on Earth. There are lots of bacteria in and on your body. In fact, your body has about 10 times more bacteria cells than human cells.

The full article covers:

  • What are bacteria?
  • How do bacterial infections spread?
  • What are the treatments for bacterial infections?
  • Can bacterial infections be prevented?

Read the full article at MedlinePlus

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

Convert A74.89 to ICD-9-CMHistory

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

ICD-9-CM
078.88 Oth spec dis chlamydiae
Approximate The match is approximate rather than exact.

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 A74.89Overview

Is A74.89 (Other chlamydial diseases) a billable code?

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

What MS-DRG does A74.89 group to?

When other chlamydial diseases is the principal diagnosis on an inpatient stay, it groups to MS-DRG 865, 866, with relative weights from 0.8696 to 1.4983 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of A74.89?

Under the General Equivalence Mappings, other chlamydial diseases converts to ICD-9-CM 078.88 (oth spec dis chlamydiae). The mapping is approximate, so confirm the match fits the documentation.

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.