2026 ICD-10-CM Diagnosis Code A36.89Other diphtheritic complications

ICD-10-CM Codes›A00–B99›A30-A49›A36

ICD-10-CM A36.89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A36.89 is a billable ICD-10-CM diagnosis code for other diphtheritic complications. 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 anterior nasal diphtheria. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections.

Code Identity

ICD-10-CM Code
A36.89
Billable Status
Yes — Valid for Submission
Code Describes
Other diphtheritic complications
Short Description
Other diphtheritic complications
Same as the full description in the CMS dataset.
Parent Code
A36.8
Other diphtheria

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA30-A49Other bacterial diseases
CategoryA36Diphtheria
This CodeA36.89Other diphtheritic complications

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Anterior nasal diphtheria
  • Autonomic disorder due to diphtheria
  • Corynebacterial mastitis
  • Diphtheria of penis
  • Diphtheritic neuropathy
  • Diphtheritic peritonitis
  • Disorder of autonomic nervous system due to infectious disease
  • Ocular diphtheria
  • Respiratory diphtheria
  • Tracheobronchial diphtheria

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Diphtheritic peritonitis

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.

    • Diphtheria, diphtheritic(gangrenous) (hemorrhagic)
      • nasal, anterior
    • Diphtheria, diphtheritic(gangrenous) (hemorrhagic)
      • neurological complication
    • Diphtheria, diphtheritic(gangrenous) (hemorrhagic)
      • specified site NEC
    • Lymphadenitis
      • due to
        • diphtheria (toxin)
    • Paralysis, paralytic(complete) (incomplete)
      • iris
        • due to diphtheria (toxin)
    • Peritonitis(adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion)
      • diphtheritic
    • Stomatitis(denture) (ulcerative)
      • diphtheritic
    • Tracheitis(catarrhal) (infantile) (membranous) (plastic) (septal) (suppurative) (viral)
      • diphtheritic (membranous)

Clinical ClassificationClinical

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

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

Clinical InformationClinical

  • Anterior Nasal Diphtheria

    infection of the anterior nasal structures by corynebacterium diphtheriae.

Patient EducationClinical

Diphtheria

Diphtheria is a serious bacterial infection. You can catch it from a person who has the infection and coughs or sneezes. You can also get infected by coming in contact with an object, such as a toy, that has bacteria on it.

Read the full article at MedlinePlus

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

Convert A36.89 to ICD-9-CMHistory

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

ICD-9-CM
032.2 Ant nasal diphtheria
Approximate The match is approximate rather than exact.
ICD-9-CM
032.83 Diphtheritic peritonitis
Approximate The match is approximate rather than exact.
ICD-9-CM
032.89 Diphtheria NEC
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 A36.89Overview

Is A36.89 (Other diphtheria) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other diphtheritic complications on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does A36.89 group to?

When other diphtheritic complications 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 A36.89?

Under the General Equivalence Mappings, other diphtheritic complications converts to ICD-9-CM 032.2 (ant nasal diphtheria), 032.83 (diphtheritic peritonitis), and 032.89 (diphtheria NEC). 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.