A03.0 ICD-10-CM Code: Shigellosis due to Shigella dysenteriae
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Intestinal infectious diseases (A00-A09)
A03.0
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceShigellosis due to Shigella dysenteriae
A bacterial infection of the intestines caused by Shigella dysenteriae bacteria, which causes severe diarrhea, abdominal cramps, and fever. This is a contagious foodborne or waterborne illness that spreads through contaminated food or water.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
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Code Book Path
Inclusion Terms
Official- Group A shigellosis [Shiga-Kruse dysentery]
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A03.0 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A03.0 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A03.0 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A03.0 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A03.0 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A03.0 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is A03.0 an HCC code?
No. A03.0 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A03.0 is the ICD-10-CM diagnosis code for shigellosis due to shigella dysenteriae. A bacterial infection of the intestines caused by Shigella dysenteriae bacteria, which causes severe diarrhea, abdominal cramps, and fever. This is a contagious foodborne or waterborne illness that spreads through contaminated food or water. A03.0 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering intestinal infectious diseases (a00-a09).
A03.0 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Verify the specific Shigella species (dysenteriae) is documented in the medical record before assigning this code, as different Shigella species have different codes (A03.1, A03.2, A03.3, A03.9).
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A03.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify the specific Shigella species (dysenteriae) is documented in the medical record before assigning this code, as different Shigella species have different codes (A03.1, A03.2, A03.3, A03.9)
- •This code includes the causative organism, so do not separately code for the bacterial agent; document the clinical presentation (diarrhea, dysentery) with appropriate additional codes if needed