Certain zoonotic bacterial diseases (A20-A28)
chapter 1: Certain Infectious and Parasitic Diseases
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Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Rules for coding infections and parasitic diseases, including HIV, organism and drug resistance codes, sepsis and septic shock, MRSA, Zika, and COVID-19.
- Human Immunodeficiency Virus (HIV) Infections (page 19)
- Infectious agents as the cause of diseases classified to other chapters (page 22)
- Infections resistant to antibiotics (page 22)
- Sepsis, Severe Sepsis, and Septic Shock (page 23)
- Methicillin Resistant Staphylococcus aureus (MRSA) Conditions (page 27)
- Zika virus infections (page 28)
- Coronavirus infections (page 28)
All codes under A20-A28
A20-A28 can't be used on a claim. Pick a billable code below; grey headings group them.
- A20Plague
- A20.0Bubonic plague
- A20.1Cellulocutaneous plague
- A20.2Pneumonic plague
- A20.3Plague meningitis
- A20.7Septicemic plague
- A20.8Other forms of plague
- A20.9Plague, unspecified
- A21Tularemia
- A21.0Ulceroglandular tularemia
- A21.1Oculoglandular tularemia
- A21.2Pulmonary tularemia
- A21.3Gastrointestinal tularemia
- A21.7Generalized tularemia
- A21.8Other forms of tularemia
- A21.9Tularemia, unspecified
- A22Anthrax
- A22.0Cutaneous anthrax
- A22.1Pulmonary anthrax
- A22.2Gastrointestinal anthrax
- A22.7Anthrax sepsis
- A22.8Other forms of anthrax
- A22.9Anthrax, unspecified
- A23Brucellosis
- A23.0Brucellosis due to Brucella melitensis
- A23.1Brucellosis due to Brucella abortus
- A23.2Brucellosis due to Brucella suis
- A23.3Brucellosis due to Brucella canis
- A23.8Other brucellosis
- A23.9Brucellosis, unspecified
- A24Glanders and melioidosis
- A24.0Glanders
- A24.1Acute and fulminating melioidosis
- A24.2Subacute and chronic melioidosis
- A24.3Other melioidosis
- A24.9Melioidosis, unspecified
- A25Rat-bite fevers
- A25.0Spirillosis
- A25.1Streptobacillosis
- A25.9Rat-bite fever, unspecified
- A26Erysipeloid
- A26.0Cutaneous erysipeloid
- A26.7Erysipelothrix sepsis
- A26.8Other forms of erysipeloid
- A26.9Erysipeloid, unspecified
- A27Leptospirosis
- A27.0Leptospirosis icterohemorrhagica
- A27.8Other forms of leptospirosis
- A27.81Aseptic meningitis in leptospirosis
- A27.89Other forms of leptospirosis
- A27.9Leptospirosis, unspecified
- A28Other zoonotic bacterial diseases, not elsewhere classified
- A28.0Pasteurellosis
- A28.1Cat-scratch disease
- A28.2Extraintestinal yersiniosis
- A28.8Other specified zoonotic bacterial diseases, not elsewhere classified
- A28.9Zoonotic bacterial disease, unspecified
A20-A28 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Plague
Plague is an infection caused by the bacterium Yersinia pestis. The bacteria are found mainly in rats and in the fleas that feed on them. People and other animals can get plague from rat or flea bites. In the past, plague destroyed entire civilizations. Today plague is uncommon, due to better living conditions and antibiotics.
Read more about plague on MedlinePlus