2027 ICD-10-CM Diagnosis Code A28Other zoonotic bacterial diseases, not elsewhere classified

ICD-10-CM Codes›A00–B99›A20-A28›A28

ICD-10-CM A28
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A28 is a non-billable ICD-10-CM category code for other zoonotic bacterial diseases, not elsewhere classified, so it cannot be submitted on claims. Use a more specific code from this category instead, such as A28.0, A28.1, A28.2, and A28.8.

Code Identity

ICD-10-CM Code
A28
Billable Status
No — Non-Billable Category
Code Describes
Other zoonotic bacterial diseases, not elsewhere classified
Short Description
Other zoonotic bacterial diseases, not elsewhere classified
Same as the full description in the CMS dataset.
Chapter
A20-A28
Certain zoonotic bacterial diseases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA20-A28Certain zoonotic bacterial diseases
CategoryA28Other zoonotic bacterial diseases, not elsewhere classified
This CodeA28Other zoonotic bacterial diseases, not elsewhere classified

Specific Coding for Other zoonotic bacterial diseases, not elsewhere classifiedOverview

Non-specific codes like A28 require more characters. Use one of these billable codes instead:

  • Use A28.0 for Pasteurellosis

  • Use A28.1 for Cat-scratch disease

  • Use A28.2 for Extraintestinal yersiniosis

  • Use A28.8 for Other specified zoonotic bacterial diseases, not elsewhere classified

  • Use A28.9 for Zoonotic bacterial disease, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A28: its own notes plus those printed at 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

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 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.

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.

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 A28Overview

What is the ICD-10 code for other zoonotic bacterial diseases, not elsewhere classified?

A28 is the ICD-10-CM category for other zoonotic bacterial diseases, not elsewhere classified, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is A28 (Other zoonotic bacterial diseases, not elsewhere classified) a billable code?

No. This is a category header that groups the codes for other zoonotic bacterial diseases, not elsewhere classified, and headers cannot be submitted on claims. Claims for other zoonotic bacterial diseases, not elsewhere classified need a more specific code from this category, such as A28.0, A28.1, and A28.2.