ICD-10 Code B96.23 – Unspecified Shiga toxin-producing Escherichia coli [E. coli] [STEC] as the cause of diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B96.23 – Unspecified Shiga toxin-producing Escherichia coli [E. coli] [STEC] as the cause of diseases classified elsewhere
What it is
This code identifies unspecified STEC as the documented cause of another condition. Use it when the organism is named, but the record does not specify a more detailed STEC type.
Clinical signs
Clinical features vary; refer to documentation. STEC infection is commonly associated with diarrheal illness, and severe cases may be linked to complications such as hemolytic uremic syndrome.
When to use this code
Use B96.23 when the provider states that unspecified STEC caused a disease classified elsewhere, such as an intestinal or systemic infection coded separately. You should link it to the underlying condition only when the record clearly supports that causal relationship. If the chart names STEC but not the specific subtype, this code fits.
Do not use for
Do not use this code for a primary diagnosis of diarrheal illness without documentation that STEC caused it. Do not use it when the organism is a different E. coli type or when the documentation is too vague. Check documentation.
Coding tip
Pair this code with the underlying condition code and confirm the provider explicitly documents causation.