B96.23 ICD-10-CM Code: Unspecified Shiga toxin-producing Escherichia coli [E. coli] [STEC] as the cause of diseases classified elsewhere
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Bacterial and viral infectious agents (B95-B97)
B96.23
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceUnspecified Shiga toxin-producing Escherichia coli [E. coli] [STEC] as the cause of diseases classified elsewhere
An infection caused by Shiga toxin-producing E. coli where the specific strain or serotype has not been identified.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Shiga toxin-producing Escherichia coli [E. coli] with unspecified O group
- STEC NOS
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for B96.23 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for B96.23 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for B96.23 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for B96.23 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for B96.23 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for B96.23 in this effective period.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is B96.23 an HCC code?
No. B96.23 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- B96.23
- Description
- Unspecified Shiga toxin-producing Escherichia coli [E. coli] [STEC] as the cause of diseases classified elsewhere
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
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
B96.23 is the ICD-10-CM diagnosis code for unspecified shiga toxin-producing escherichia coli [e. coli] [stec] as the cause of diseases classified elsewhere. An infection caused by Shiga toxin-producing E. coli where the specific strain or serotype has not been identified. B96.23 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering bacterial and viral infectious agents (b95-b97).
B96.23 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.
Use this code when STEC is confirmed but the specific strain cannot be determined or specified.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for B96.23 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code when STEC is confirmed but the specific strain cannot be determined or specified
- •Encourage laboratory testing to identify the specific serotype for epidemiological tracking and public health purposes