Typhoid and paratyphoid fevers
In Intestinal infectious diseases (A00-A09), chapter 1: Certain Infectious and Parasitic Diseases
11 billable codes under A01: all are a CC; 2 map to HCC 92 (Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.
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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 A01
A01 can't be used on a claim. Pick a billable code below; grey headings group them.
- A01.0Typhoid fever
- A01.00Typhoid fever, unspecified
- A01.01Typhoid meningitis
- A01.02Typhoid fever with heart involvement
- A01.03Typhoid pneumonia
- A01.04Typhoid arthritis
- A01.05Typhoid osteomyelitis
- A01.09Typhoid fever with other complications
- A01.1Paratyphoid fever A
- A01.2Paratyphoid fever B
- A01.3Paratyphoid fever C
- A01.4Paratyphoid fever, unspecified
A01 MS-DRGs
As the principal diagnosis, all 11 billable codes under A01 group to MS-DRG 867, 868, or 869 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Other codes that refer to A01
Notes on these codes point to A01.
- M49 Code First: enterobacterial infections (A01-A04)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Salmonella Infections
Salmonella is the name of a group of bacteria. In the United States, it is a common cause of foodborne illness. Salmonella occurs in raw poultry, eggs, beef, and sometimes on unwashed fruit and vegetables. You also can get infected after handling pets, especially reptiles like snakes, turtles, and lizards.
Read more about salmonella infections on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.