Coding and coverage · ICD-10-CM
B96.21 Shiga toxin-producing Escherichia coli [E. coli] [STEC] O157 as the cause of diseases classified elsewhere
Instructional notes
Chapter 1
Excludes2Not included here: the patient may have both; report both when both are present.
- 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 codeAdd a second code for the full picture.
- code to identify resistance to antimicrobial drugs (Z16.-)
Includes
- diseases generally recognized as communicable or transmissible
Section B95-B97
Notes
- These categories are provided for use as supplementary or additional codes to identify the infectious agent(s) in diseases classified elsewhere.
This code
Inclusion terms
- E. coli O157:H- (nonmotile) with confirmation of Shiga toxin
- E. coli O157 with confirmation of Shiga toxin when H antigen is unknown, or is not H7
- O157:H7 Escherichia coli [E. coli] with or without confirmation of Shiga toxin-production
- Shiga toxin-producing Escherichia coli [E. coli] O157:H7 with or without confirmation of Shiga toxin-production
- STEC O157:H7 with or without confirmation of Shiga toxin-production
Chapter 1: Certain infectious and parasitic diseases · B95-B97 Bacterial and viral infectious agents (B95-B97)
Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.
Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.