A00.1 ICD-10-CM Code: Cholera due to Vibrio cholerae 01, biovar eltor
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Intestinal infectious diseases (A00-A09)
A00.1
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceCholera due to Vibrio cholerae 01, biovar eltor
This is a severe bacterial infection caused by a specific strain of cholera bacteria (Vibrio cholerae 01, biovar eltor) that causes severe diarrhea and dehydration. This particular strain is responsible for most modern cholera outbreaks worldwide.
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- Cholera eltor
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A00.1 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A00.1 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A00.1 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A00.1 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A00.1 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A00.1 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 A00.1 an HCC code?
No. A00.1 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A00.1 is the ICD-10-CM diagnosis code for cholera due to vibrio cholerae 01, biovar eltor. This is a severe bacterial infection caused by a specific strain of cholera bacteria (Vibrio cholerae 01, biovar eltor) that causes severe diarrhea and dehydration. This particular strain is responsible for most modern cholera outbreaks worldwide. A00.1 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering intestinal infectious diseases (a00-a09).
A00.1 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.
Ensure documentation specifies the biovar eltor strain; if only 'cholera' is documented without biovar specification, use A00.9 instead.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A00.1 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Ensure documentation specifies the biovar eltor strain; if only 'cholera' is documented without biovar specification, use A00.9 instead
- •This code requires a seventh character for episode of care (A=initial encounter, D=subsequent encounter, S=sequela); verify the appropriate character is appended