ICDcodes.org
FY2027

A04.4 — Other intestinal Escherichia coli infections

BillableCC

Is A04.4 billable?

Yes — A04.4 is billable for FY2027. A04.4 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. A04.4 may be submitted for encounters from October 1, 2026 through September 30, 2027.

A04.4 at a glance

CodeA04.4
DescriptionOther intestinal Escherichia coli infections
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does A04.4 group to?

A04.4 sits in MDC 06 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 371Major Gastrointestinal Disorders and Peritoneal Infections with MCCmedical
  • 372Major Gastrointestinal Disorders and Peritoneal Infections with CCmedical
  • 373Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCCmedical

As a secondary diagnosis, A04.4 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.

How is A04.4 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to A04.4. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Diarrhea, diarrheal › due to › Escherichia coli (disease) (infantile) (inflammatory)
  • Diarrhea, diarrheal › due to › Escherichia coli › enteroaggregative (disease) (infantile) (inflammatory)
  • Diarrhea, diarrheal › due to › Escherichia coli › specified NEC (disease) (infantile) (inflammatory)
  • Enteritis › infectious NOS › due to › Escherichia coli (acute) (diarrheal) (hemorrhagic) (noninfective)
  • Enteritis › infectious NOS › due to › Escherichia coli › enteroaggregative (acute) (diarrheal) (hemorrhagic) (noninfective)
  • Enteritis › infectious NOS › due to › Escherichia coli › specified NEC (acute) (diarrheal) (hemorrhagic) (noninfective)

Inclusion terms

Alternative wording in documentation that is classified to A04.4.

  • Escherichia coli enteritis NOS

Excludes1 — never code together — inherited from A04

The conditions below can never be reported together with A04.4 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • bacterial foodborne intoxications, NEC (A05.-)
  • tuberculous enteritis (A18.32)

Use additional code — inherited from Chapter 1

Report an additional code alongside A04.4 to fully describe the condition. A04.4 is sequenced first.

  • code to identify resistance to antimicrobial drugs (Z16.-)

Excludes2 — not included here — inherited from Chapter 1

The conditions below are not part of A04.4, but a patient may have both at the same time. When documentation supports it, A04.4 and the excluded code may both be reported.

  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

How long has A04.4 existed?

A04.4 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

Which codes are confused with A04.4?

ICD-10-CM declares these codes mutually exclusive with A04.4 — exactly one of each pair can be correct for a given encounter.

Which conditions are coded to A04.4?

What other codes are in the A04 family? (9)