ICD-10-CM 2027
ICD-10 code for Helicobacter pylori infection
Other specified bacterial intestinal infections
From the official ICD-10-CM alphabetic index entry “Infection, infected, infective (opportunistic) › Helicobacter pylori”. Page updated September 29, 2026.
About coding Helicobacter pylori infection
The ICD-10-CM code for Helicobacter pylori infection is A04.8 (Other specified bacterial intestinal infections). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on A04.8.
Within A04, choose A04.8 (Other specified bacterial intestinal infections) only when documentation doesn't support a more specific option: enteropathogenic Escherichia coli infection (A04.0), enterotoxigenic Escherichia coli infection (A04.1), enteroinvasive Escherichia coli infection (A04.2), enterohemorrhagic Escherichia coli infection (A04.3), other intestinal Escherichia coli infections (A04.4), campylobacter enteritis (A04.5), enteritis due to Yersinia enterocolitica (A04.6), enterocolitis due to Clostridium difficile (A04.7) and 1 more.
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 371 (Major Gastrointestinal Disorders and Peritoneal Infections with MCC, relative weight 1.7089), DRG 372 (Major Gastrointestinal Disorders and Peritoneal Infections with CC, relative weight 0.9964) and DRG 373 (Major Gastrointestinal Disorders and Peritoneal Infections without CC/MCC, relative weight 0.6941), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific Helicobacter pylori infection codes (official index)
- as cause of disease classified elsewhere B96.81 — Helicobacter pylori [H. pylori] as the cause of diseases classified elsewhere
Common questions about Helicobacter pylori infection ICD-10 codes
What is the ICD-10 code for Helicobacter pylori infection?
- A04.8 — Other specified bacterial intestinal infections. More specific codes apply when the documentation supports them: B96.81.
Is A04.8 billable?
- Yes. A04.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A04.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A04.8 as a principal diagnosis.
Is A04.8 a CC or MCC?
- A04.8 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.