Leptospirosis
In Certain zoonotic bacterial diseases (A20-A28), chapter 1: Certain Infectious and Parasitic Diseases
4 billable codes under A27: 1 is an MCC, 3 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 A27
A27 can't be used on a claim. Pick a billable code below; grey headings group them.
A27 MS-DRGs
As the principal diagnosis, the billable codes under A27 group to these 8 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 023 Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator (2 of 4 codes)
- DRG 024 Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC (2 of 4 codes)
- DRG 097 Non-Bacterial Infection of Nervous System Except Viral Meningitis with MCC (2 of 4 codes)
- DRG 098 Non-Bacterial Infection of Nervous System Except Viral Meningitis with CC (2 of 4 codes)
- DRG 099 Non-Bacterial Infection of Nervous System Except Viral Meningitis without CC/MCC (2 of 4 codes)
- DRG 867 Other Infectious and Parasitic Diseases Diagnoses with MCC (2 of 4 codes)
- DRG 868 Other Infectious and Parasitic Diseases Diagnoses with CC (2 of 4 codes)
- DRG 869 Other Infectious and Parasitic Diseases Diagnoses without CC/MCC (2 of 4 codes)
Other codes that refer to A27
Notes on these codes point to A27.
- A65-A69 Excludes2: leptospirosis (A27.-)
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.