ICD-10 Code for Escherichia Coli

The default ICD-10-CM 2027 code for escherichia coli (E. coli) is B96.20 – Unspecified Escherichia coli [E. coli] as the cause of diseases classified elsewhere. More specific codes depend on the details documented, as listed in the official index (5 codes, 5 billable).

Main code: B96.20 – Unspecified Escherichia coli [E. coli] as the cause of diseases classified elsewhere
Billable: Yes

Index entries for Escherichia coli

non-O157 Shiga toxin-producing (with known O group) – B96.22
non-Shiga toxin-producing – B96.29
O157 – B96.21
O157 with confirmation of Shiga toxin when H antigen is unknown, or is not H7 – B96.21
O157:H- (nonmotile) – B96.21
O157:H7 with or without confirmation of Shiga toxin-production – B96.21
- specified NEC – B96.22
Shiga toxin-producing (with unspecified O group) (STEC) – B96.23
specified NEC – B96.29

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.