2026 ICD-10-CM Diagnosis Code A22.1Pulmonary anthrax
ICD-10-CM Codes›A00–B99›A20-A28›A22
- Billable — Valid for Submission
- Not Chronic
A22.1 is a billable ICD-10-CM diagnosis code for pulmonary anthrax. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 177 through 179. Coders also document this condition as anthrax. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Pneumonia (except that caused by tuberculosis).
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Anthrax
- Anthrax pneumonia
- Bacterial infection caused by Bacillus
- Inhalational anthrax
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Inhalation anthrax
- Ragpicker's disease
- Woolsorter's disease
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- with pneumonia - A22.1
- inhalation - A22.1
- pulmonary - A22.1
- respiratory - A22.1
- Disease, diseased - See Also: Syndrome;
- ragpicker's or ragsorter's - A22.1
- woolsorter's - A22.1
- anthrax - A22.1
- Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) - J18.9
- anthrax - A22.1
- anthrax - A22.1
- Bacillus anthracis - A22.1
- Ragpicker's disease - A22.1
- Ragsorter's disease - A22.1
- Woolsorter's disease - A22.1
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Anthrax
- with pneumonia
- Anthrax
- inhalation
- Anthrax
- pulmonary
- Anthrax
- respiratory
- Disease, diseased
- ragpicker's or ragsorter's
- Disease, diseased
- woolsorter's
- Inhalation
- anthrax
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- anthrax
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- in (due to)
- anthrax
- Pneumonia(acute) (double) (migratory) (purulent) (septic) (unresolved)
- in (due to)
- Bacillus anthracis
- Ragpicker's disease
- Ragsorter's disease
- Woolsorter's disease
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Convert A22.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A22.1Overview
Is A22.1 (Anthrax) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report pulmonary anthrax on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does A22.1 group to?
When pulmonary anthrax is the principal diagnosis on an inpatient stay, it groups to MS-DRG 177, 178, 179, with relative weights from 0.7550 to 1.5627 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of A22.1?
Under the General Equivalence Mappings, pulmonary anthrax converts to ICD-9-CM 022.1 (pulmonary anthrax), 022.1 (pulmonary anthrax), and 484.5 (pneumonia in anthrax). 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.
