B96.21 – Shiga toxin-producing Escherichia coli [E. coli] [STEC] O157 as the cause of diseases classified elsewhere
ICD-10-CM 2027 diagnosis code · Bacterial and viral infectious agents
- Code
B96.21(claims format:B9621)- Description
- Shiga toxin-producing Escherichia coli [E. coli] [STEC] O157 as the cause of diseases classified elsewhere
- Short description
- Shig tox E coli [STEC] O157 causing diseases classd elswhr
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 1. Certain infectious and parasitic diseases (A00-B99)
- Block
- B95-B97 Bacterial and viral infectious agents
- Parent codes
- B96 › B96.2
Notes for B96.21
- 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
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block B95-B97
- These categories are provided for use as supplementary or additional codes to identify the infectious agent(s) in diseases classified elsewhere.
Index terms for B96.21
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in B96.2
- B96.20 – Unspecified Escherichia coli [E. coli] as the cause of diseases classified elsewhereBillable
- B96.22 – Other specified Shiga toxin-producing Escherichia coli [E. coli] [STEC] as the cause of diseases classified elsewhereBillable
- B96.23 – Unspecified Shiga toxin-producing Escherichia coli [E. coli] [STEC] as the cause of diseases classified elsewhereBillable
- B96.29 – Other Escherichia coli [E. coli] as the cause of diseases classified elsewhereBillable
Frequently asked questions
What is ICD-10 code B96.21?
B96.21 is the ICD-10-CM code for shiga toxin-producing Escherichia coli [E. coli] [STEC] O157 as the cause of diseases classified elsewhere, in the block B95-B97 (Bacterial and viral infectious agents).
Is B96.21 a billable code?
Yes. B96.21 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does B96.21 belong to?
It belongs to category B96 – Other bacterial agents as the cause of diseases classified elsewhere.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.