Tularemia
In Certain zoonotic bacterial diseases (A20-A28), chapter 1: Certain Infectious and Parasitic Diseases
7 billable codes under A21: all are a CC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.
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Instructional notes
Includes: conditions that are coded here
- deer-fly fever
- infection due to Francisella tularensis
- rabbit fever
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 A21
A21 can't be used on a claim. Pick a billable code below; grey headings group them.
A21 MS-DRGs
As the principal diagnosis, the billable codes under A21 group to these 9 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 867 Other Infectious and Parasitic Diseases Diagnoses with MCC (5 of 7 codes)
- DRG 868 Other Infectious and Parasitic Diseases Diagnoses with CC (5 of 7 codes)
- DRG 869 Other Infectious and Parasitic Diseases Diagnoses without CC/MCC (5 of 7 codes)
- DRG 177 Respiratory Infections and Inflammations with MCC (1 of 7 codes)
- DRG 178 Respiratory Infections and Inflammations with CC (1 of 7 codes)
- DRG 179 Respiratory Infections and Inflammations without CC/MCC (1 of 7 codes)
- DRG 371 Major Gastrointestinal Disorders and Peritoneal Infections with MCC (1 of 7 codes)
- DRG 372 Major Gastrointestinal Disorders and Peritoneal Infections with CC (1 of 7 codes)
- DRG 373 Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCC (1 of 7 codes)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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.
Read more about bacterial infections on MedlinePlusTick Bites
Ticks are small parasites. They may look like insects, but they have eight legs and are related to spiders. Ticks feed on the blood of people and warm-blooded animals. There are many types of ticks in the United States, and they live in different parts of the country.
Read more about tick bites on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.