Listeriosis, unspecified

This code represents an infection caused by the bacterium Listeria monocytogenes, where the specific clinical manifestation or site of infection is not documented. Listeriosis can present with a range of symptoms, from mild gastroenteritis to severe invasive forms like meningitis or sepsis, particularly in vulnerable populations.

Use this code when the medical record clearly indicates a diagnosis of listeriosis, but lacks further specification regarding the affected organ system or clinical syndrome. Documentation supporting its use would include a positive Listeria culture or serology, or a physician's definitive diagnosis of listeriosis without additional detail.

• Avoid using this code if a more specific site of infection (e.g., meningitis, sepsis, endocarditis) is documented; always code to the highest level of specificity.
• Consider codes from Chapter 16 (P00-P96) if the listeriosis is congenital, as this code is for acquired infections.
• Review the medical record for any associated conditions or complications, such as sepsis or pneumonia, and code them accordingly.