Other zoonotic bacterial diseases, not elsewhere classified
In Certain zoonotic bacterial diseases (A20-A28), chapter 1: Certain Infectious and Parasitic Diseases
5 billable codes under A28: 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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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 A28
A28 can't be used on a claim. Pick a billable code below; grey headings group them.
A28 MS-DRGs
As the principal diagnosis, the billable codes under A28 group to MS-DRG 867, 868, 869, 814, 815, or 816 (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 (4 of 5 codes)
- DRG 868 Other Infectious and Parasitic Diseases Diagnoses with CC (4 of 5 codes)
- DRG 869 Other Infectious and Parasitic Diseases Diagnoses without CC/MCC (4 of 5 codes)
- DRG 814 Reticuloendothelial and Immunity Disorders with MCC (1 of 5 codes)
- DRG 815 Reticuloendothelial and Immunity Disorders with CC (1 of 5 codes)
- DRG 816 Reticuloendothelial and Immunity Disorders without CC/MCC (1 of 5 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 MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.