B96.21

Billable
ChapterA00–B99
Ranksubcategory
Official Description

Shiga toxin-producing Escherichia coli [E. coli] [STEC] O157 as the cause of diseases classified elsewhere

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

Instructional Notes

Includes
  • 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
General instructions are available for the parent sections:
View CH1 Notes

Clinical Hierarchy

CH1Certain infectious and parasitic diseases (A00-B99)
B95-B97Bacterial and viral infectious agents (B95-B97)
B96Other bacterial agents as the cause of diseases classified elsewhere
B96.2Escherichia coli [E. coli ] as the cause of diseases classified elsewhere
B96.21Shiga toxin-producing Escherichia coli [E. coli] [STEC] O157 as the cause of diseases classified elsewhere

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to B96.21:

chapterCH1
Certain infectious and parasitic diseases (A00-B99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to B96.21. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

4 raw paths
Escherichia coli (E. coli), as cause of disease classified elsewhere4 unique routes
O157→B96.21
O157 with confirmation of Shiga toxin when H antigen is unknown, or is not H7→B96.21
O157:H- (nonmotile) with confirmation of Shiga toxin→B96.21
O157:H7 with or without confirmation of Shiga toxin-production→B96.21

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 867
Other Infectious and Parasitic Diseases Diagnoses with MCC
DRG 868
Other Infectious and Parasitic Diseases Diagnoses with CC
DRG 869
Other Infectious and Parasitic Diseases Diagnoses without CC/MCC

Cross Reference

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Find surgical and procedural codes related to Shiga toxin-producing Escherichia coli [E. coli] [STEC] O157 as the cause of diseases classified elsewhere.

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