2026 ICD-10-CM Diagnosis Code A49.2Hemophilus influenzae infection, unspecified site

ICD-10-CM Codes›A00–B99›A30-A49›A49

ICD-10-CM A49.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A49.2 is a billable ICD-10-CM diagnosis code for hemophilus influenzae infection, unspecified site. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 867 through 869. Coders also document this condition as haemophilus influenzae infection. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections.

Code Identity

ICD-10-CM Code
A49.2
Billable Status
Yes — Valid for Submission
Code Describes
Hemophilus influenzae infection, unspecified site
Short Description
Hemophilus influenzae infection, unspecified site
Same as the full description in the CMS dataset.
Parent Code
A49
Bacterial infection of unspecified site

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA30-A49Other bacterial diseases
CategoryA49Bacterial infection of unspecified site
This CodeA49.2Hemophilus influenzae infection, unspecified site

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Haemophilus influenzae infection
  • Haemophilus influenzae type b infection
  • Haemophilus influenzae type b invasive infection
  • Invasive Haemophilus influenzae disease

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Infection, infected, infective(opportunistic)
      • Hemophilus
        • influenzae NEC

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INF003
Bacterial infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Haemophilus Infections

Haemophilus is the name of a group of bacteria. There are several types of Haemophilus. They can cause different types of illnesses involving breathing, bones and joints, and the nervous system.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert A49.2 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
041.5 H. influenzae infect NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A49.2Overview

Is A49.2 (Bacterial infection of unspecified site) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report hemophilus influenzae infection, unspecified site on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does A49.2 group to?

When hemophilus influenzae infection, unspecified site is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 868, 869, with relative weights from 0.7297 to 2.0932 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of A49.2?

Under the General Equivalence Mappings, hemophilus influenzae infection, unspecified site converts to ICD-9-CM 041.5 (h. influenzae infect NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.