Cracking the Code

Coding Shigella

Shigella is a Gram-negative bacterium responsible for bloody diarrhea. Treatment for most cases of Shigella is aimed at rehydration and does not involve antibiotics. Patients with weakened immune systems may be more likely to become severely ill. According to the CDC, Shigella bacteria cause an infection called shigellosis. Shigella cause an estimated 450,000 infections in the United States each year and an estimated $93 million in direct medical costs.


Infection is diagnosed when a laboratory identifies Shigella bacteria in the stool of an ill person. The test could be a culture that isolates the bacteria or a rapid diagnostic test that detects the genetic material of the bacteria.


When coding Shigella, we see selections for the different subgroups/species based on biochemical and Serological characteristics. Code selection will be based on provider documentation.

Q: What is the ICD-10-CM code for Shigellosis?
A: A03.9. Rationale: When we look in our ICD-10-CM Alphabetic index under Shigellosis, we are referred to code A03.9. When we follow this code in our Tabular section, we see code A03.9 is appropriate for Shigellosis, unspecified, as well as Bacillary dysentery NOS.
Reference: FY 2023 ICD-10-CM code book,
Scroll to Top
Call Now Button