2026 ICD-10-CM Diagnosis Code A22Anthrax

ICD-10-CM Codes›A00–B99›A20-A28›A22

ICD-10-CM A22
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

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

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • infection due to Bacillus anthracis

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.

  • Anthrax Vaccines

    vaccines or candidate vaccines used to prevent anthrax.

  • Bacillus anthracis

    a species of bacteria that causes anthrax in humans and animals.

  • Anthrax

    an infection caused by bacillus anthracis bacteria. it may affect the lungs, gastrointestinal tract, or skin. patients with lung infection present with fever, headaches, cough, chest pain and shortness of breath. patients with gastrointestinal infection present with nausea, vomiting and bloody diarrhea. patients with skin infection develop blisters and ulcers.

  • Anthrax Toxin Receptor 1|ANTXR1|Tumor Endothelial Marker 8

    anthrax toxin receptor 1 (564 aa, ~63 kda) is encoded by the human antxr1 gene. this protein plays a role in the regulation of both cell adhesion and cellular motility.

  • ANTXR1 Gene|ANTXR1|ANTXR1|Anthrax Toxin Receptor 1 Gene

    this gene plays a role in cell-matrix adhesion.

  • ANTXR1 wt Allele|ATR|Anthrax Toxin Receptor 1 wt Allele|FLJ10601|FLJ21776|TEM8

    human antxr1 wild-type allele is located in the vicinity of 2p13.1 and is approximately 236 kb in length. this allele, which encodes anthrax toxin receptor 1 protein, is involved in the modulation of cytoskeletal rearrangement, cellular adhesion and cell migration. mutation of the gene is associated with hemangioma capillary infantile.

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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A22Overview

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.