ICD-10 Code for Colibacillosis

The ICD-10-CM code for colibacillosis is A49.8 — Other bacterial infections of unspecified site. This is the code the Alphabetic Index gives for colibacillosis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).

BillableUnspecified

A49.8 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.

Which colibacillosis code should you use?

The Alphabetic Index lists 3 codes under Colibacillosis. 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

as the cause of other disease	B96.20	Unspecified Escherichia coli [E. coli] as the cause of diseases classified elsewhere
generalized	A41.51	Sepsis due to Escherichia coli [E. coli]

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