B96.21
Shiga toxin-producing Escherichia coli [E. coli] [STEC] O157 as the cause of diseases classified elsewhere
This code does not map to a risk-adjusting HCC in the loaded models.
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
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
These categories are provided for use as supplementary or additional codes to identify the infectious agent(s) in diseases classified elsewhere.
diseases generally recognized as communicable or transmissible
certain localized infections - see body system-related chapters
carrier or suspected carrier of infectious disease (Z22.-) 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)
code to identify resistance to antimicrobial drugs (Z16.-)
Official Guidelines for B96.21
FY 2026 ›Subsections
- I.C.1.aHuman Immunodeficiency Virus (HIV) Infections
- I.C.1.bInfectious agents as the cause of diseases classified to other chapters
- I.C.1.cInfections resistant to antibiotics
- I.C.1.dSepsis, Severe Sepsis, and Septic Shock Infections resistant to antibiotics
- I.C.1.eMethicillin Resistant Staphylococcus aureus (MRSA) Conditions
- I.C.1.fZika virus infections
- I.C.1.gCoronavirus infections
Sections that reference B96.21
- I.B.7Multiple coding for a single conditionConventions & general rules
… code from category B95, Streptococcus, Staphylococcus, and Enterococcus, as the cause of diseases classified elsewhere, or B96, Other bacterial agents as the cause of diseases classified elsewhere, may be required to identify the bacterial organism …
- I.C.1.bInfectious agents as the cause of diseases classified to other chapters
… code from category B95, Streptococcus, Staphylococcus, and Enterococcus as the cause of diseases classified to other chapters, B96, Other bacterial agents as the cause of diseases classified to other chapters, or B97, Viral agents as the cause of diseases …
- I.C.10.d.1)Documentation of Ventilator associated PneumoniaChapter 10
… An additional code to identify the organism (e.g., Pseudomonas aeruginosa, code B96.5) should also be assigned. …
- I.C.16.fBacterial Sepsis of NewbornChapter 16
… code from category B95, Streptococcus, Staphylococcus, and Enterococcus as the cause of diseases classified elsewhere, or B96, Other bacterial agents as the cause of diseases classified elsewhere, should not be assigned. …
- I.C.15.kPuerperal sepsisChapter 15
… assigned with a secondary code to identify the causal organism (e.g., for a bacterial infection, assign a code from category B95-B96, Bacterial infections in conditions classified elsewhere). …
Sections whose FY 2026 text names B96.21, its B96 category, or a range containing it — the chapter guidance above is the authoritative source.
Find B96.21 in the alphabetic index
4 index paths lead to this code
- Escherichia coli, as cause of disease classified elsewhere › O157
- Escherichia coli, as cause of disease classified elsewhere › O157 with confirmation of Shiga toxin when H antigen is unknown, or is not H7
- Escherichia coli, as cause of disease classified elsewhere › O157:H- with confirmation of Shiga toxin
- Escherichia coli, as cause of disease classified elsewhere › O157:H7 with or without confirmation of Shiga toxin-production