ICD-10 Code for Escherichia coli
Also indexed as (E. coli)
The ICD-10-CM code for escherichia coli is B96.20 — Unspecified Escherichia coli [E. coli] as the cause of diseases classified elsewhere. This is the code the Alphabetic Index gives for escherichia coli with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
B96.20 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which escherichia coli code should you use?
The Alphabetic Index lists 5 codes under Escherichia coli, as cause of disease classified elsewhere. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| non-O157 Shiga toxin-producing | B96.22 | Other specified Shiga toxin-producing Escherichia coli [E. coli] [STEC] as the cause of diseases classified elsewhere | |
| non-Shiga toxin-producing | B96.29 | Other Escherichia coli [E. coli] as the cause of diseases classified elsewhere | |
| O157 | B96.21 | Shiga toxin-producing Escherichia coli [E. coli] [STEC] O157 as the cause of diseases classified elsewhere | |
| O157 with confirmation of Shiga toxin when H antigen is unknown, or is not H7 | B96.21 | Shiga toxin-producing Escherichia coli [E. coli] [STEC] O157 as the cause of diseases classified elsewhere | |
| O157:H-with confirmation of Shiga toxin | B96.21 | Shiga toxin-producing Escherichia coli [E. coli] [STEC] O157 as the cause of diseases classified elsewhere | |
| O157:H7 with or without confirmation of Shiga toxin-production | B96.21 | Shiga toxin-producing Escherichia coli [E. coli] [STEC] O157 as the cause of diseases classified elsewhere | |
| Shiga toxin-producing | B96.23 | Unspecified Shiga toxin-producing Escherichia coli [E. coli] [STEC] as the cause of diseases classified elsewhere | |
| specified NEC | B96.29 | Other Escherichia coli [E. coli] as the cause of diseases classified elsewhere |
Escherichia coli O157:H7 with or without confirmation of Shiga toxin-production
| specified NEC | B96.22 | Other specified Shiga toxin-producing Escherichia coli [E. coli] [STEC] as the cause of diseases classified elsewhere |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources