2027 ICD-10-CM Diagnosis Code A22Anthrax

ICD-10-CM Codes›A00–B99›A20-A28›A22

ICD-10-CM A22
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A22 is a non-billable ICD-10-CM category code for anthrax, so it cannot be submitted on claims. Use a more specific code from this category instead, such as A22.0, A22.1, A22.2, and A22.7.

Code Identity

ICD-10-CM Code
A22
Billable Status
No — Non-Billable Category
Code Describes
Anthrax
Short Description
Anthrax
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
CategoryA22Anthrax
This CodeA22Anthrax

Specific Coding for AnthraxOverview

Non-specific codes like A22 require more characters. Use one of these billable codes instead:

  • Use A22.0 for Cutaneous anthrax

  • Use A22.1 for Pulmonary anthrax

  • Use A22.2 for Gastrointestinal anthrax

  • Use A22.7 for Anthrax sepsis

  • Use A22.8 for Other forms of anthrax

  • Use A22.9 for Anthrax, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A22: 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.

On A22 itself
  • infection due to Bacillus anthracis
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.

Clinical InformationClinical

  • Anthrax

    an acute infection caused by the spore-forming bacteria bacillus anthracis. it commonly affects hoofed animals such as sheep and goats. infection in humans often involves the skin (cutaneous anthrax), the lungs (inhalation anthrax), or the gastrointestinal tract. anthrax is not contagious and can be treated with antibiotics.

Patient EducationClinical

Anthrax

Anthrax is a disease caused by Bacillus anthracis, a germ that lives in soil. Many people know about it from the 2001 bioterror attacks. In the attacks, someone purposely spread anthrax through the U.S. mail. This killed five people and made 22 sick.

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 A22Overview

What is the ICD-10 code for anthrax?

A22 is the ICD-10-CM category for anthrax, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is A22 (Anthrax) a billable code?

No. This is a category header that groups the codes for anthrax, and headers cannot be submitted on claims. Claims for anthrax need a more specific code from this category, such as A22.0, A22.1, and A22.2.