2026 ICD-10-CM Diagnosis Code A39.84Postmeningococcal arthritis

ICD-10-CM Codes›A00–B99›A30-A49›A39

ICD-10-CM A39.84
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A39.84 is a billable ICD-10-CM diagnosis code for postmeningococcal arthritis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 548 through 550. Coders also document this condition as arthropathy associated with bacterial disease. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Immune-mediated/reactive arthropathies.

Code Identity

ICD-10-CM Code
A39.84
Billable Status
Yes — Valid for Submission
Code Describes
Postmeningococcal arthritis
Short Description
Postmeningococcal arthritis
Same as the full description in the CMS dataset.
Parent Code
A39.8
Other meningococcal infections

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA30-A49Other bacterial diseases
CategoryA39Meningococcal infection
This CodeA39.84Postmeningococcal arthritis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Arthropathy associated with bacterial disease
  • Post-bacterial arthropathy
  • Postmeningococcal arthritis

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.

    • Arthritis, arthritic(acute) (chronic) (nonpyogenic) (subacute)
      • postmeningococcal

Clinical ClassificationClinical

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

CCSR INF003
Bacterial infections
Default principal diagnosis: inpatient No · outpatient No
CCSR MUS008
Immune-mediated/reactive arthropathies
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Meningococcal Infections

    infections with bacteria of the species neisseria meningitidis.

  • Neisseria meningitidis

    a species of gram-negative, aerobic bacteria. it is a commensal and pathogen only of humans, and can be carried asymptomatically in the nasopharynx. when found in cerebrospinal fluid it is the causative agent of cerebrospinal meningitis (meningitis, meningococcal). it is also found in venereal discharges and blood. there are at least 13 serogroups based on antigenic differences in the capsular polysaccharides; the ones causing most meningitis infections being a, b, c, y, and w-135. each serogroup can be further classified by serotype, serosubtype, and immunotype.

Patient EducationClinical

Infectious Arthritis

Most kinds of arthritis cause pain and swelling in your joints. Joints are places where two bones meet, such as your elbow or knee. Infectious arthritis is an infection in the joint. The infection comes from a bacterial, viral, or fungal infection that spreads from another part of the body. Symptoms of infectious arthritis include:

Read the full article at MedlinePlus

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

Convert A39.84 to ICD-9-CMHistory

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

ICD-9-CM
036.82 Meningococc arthropathy
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 A39.84Overview

Is A39.84 (Other meningococcal infections) a billable code?

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

What MS-DRG does A39.84 group to?

When postmeningococcal arthritis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 548, 549, 550, with relative weights from 0.8741 to 1.9309 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of A39.84?

Under the General Equivalence Mappings, postmeningococcal arthritis converts to ICD-9-CM 036.82 (meningococc arthropathy). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.