2027 ICD-10-CM Diagnosis Code A03.1Shigellosis due to Shigella flexneri
ICD-10-CM Codes›A00–B99›A00-A09›A03
- Billable — Valid for Submission
- Not Chronic
A03.1 is a billable ICD-10-CM diagnosis code for shigellosis due to Shigella flexneri. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 371 through 373. Coders also document this condition as enteritis of small intestine caused by Shigella. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Intestinal infection.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Enteritis of small intestine caused by Shigella
- Infection caused by Group B Shigella
- Shigella colitis
- Shigella flexneri colitis
- Shigella flexneri enteritis of intestine
- Shigella flexneri enteritis of small intestine
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A03.1: its own notes plus those printed at Chapter 1. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- diseases generally recognized as communicable or transmissible
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Group B shigellosis
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name A03.1, its category, or a range that includes it.
Excludes2 2
These codes carry an Excludes2 note naming A03.1: its condition is not part of those codes, and both may be reported when the patient has both.
- Block P35-P39 Infections specific to the perinatal period
- P37 Other congenital infectious and parasitic diseases
Code First 1
These codes say to code first a condition named in the note, and A03.1 is one of the conditions named.
- M49 Spondylopathies in diseases classified elsewhere
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Dysentery, dysenteric (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical) A09
Flexner's dysentery A03.1
Hiss-Russell dysentery A03.1
Group B A03.1
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Shigellosis
an intestinal disease cause by shigella bacteria.
Patient EducationClinical
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.
The full article covers:
- What are bacteria?
- How do bacterial infections spread?
- What are the treatments for bacterial infections?
- Can bacterial infections be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert A03.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A03.1Overview
What is the ICD-10 code for shigellosis due to Shigella flexneri?
The ICD-10-CM code for shigellosis due to Shigella flexneri is A03.1 (sometimes written as A031). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is A03.1 (Shigellosis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report shigellosis due to Shigella flexneri on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does A03.1 group to?
When shigellosis due to Shigella flexneri is the principal diagnosis on an inpatient stay, it groups to MS-DRG 372, 371, 373, with relative weights from 0.6945 to 1.7087 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of A03.1?
Under the General Equivalence Mappings, shigellosis due to Shigella flexneri converts to ICD-9-CM 004.1 (Shigella flexneri). The mapping is a direct match.
