2026 ICD-10-CM Diagnosis Code A87.2Lymphocytic choriomeningitis

ICD-10-CM Codes›A00–B99›A80-A89›A87

ICD-10-CM A87.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A87.2 is a billable ICD-10-CM diagnosis code for lymphocytic choriomeningitis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Meningitis and Viral infection.

Code Identity

ICD-10-CM Code
A87.2
Billable Status
Yes — Valid for Submission
Code Describes
Lymphocytic choriomeningitis
Short Description
Lymphocytic choriomeningitis
Same as the full description in the CMS dataset.
Parent Code
A87
Viral meningitis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA80-A89Viral and prion infections of the central nervous system
CategoryA87Viral meningitis
This CodeA87.2Lymphocytic choriomeningitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Arenavirus encephalitis
  • Arenavirus meningitis
  • Chronic benign lymphocytic meningitis
  • Chronic lymphocytic meningitis
  • Chronic meningitis
  • Congenital infection caused by Lymphocytic choriomeningitis virus
  • Encephalomyelitis caused by lymphocytic choriomeningitis virus
  • Infection caused by Lymphocytic choriomeningitis virus
  • Lymphocytic choriomeningitis virus encephalitis
  • Lymphocytic meningitis
  • Lymphocytic meningoencephalitis
  • Meningitis caused by lymphocytic choriomeningitis virus
  • Meningoencephalitis caused by Lymphocytic choriomeningitis virus
  • Meningoencephalitis caused by virus

Tabular List NotesGuidance

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

Inclusion Terms

  • Lymphocytic meningoencephalitis

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.

    • Chorioencephalitis(acute) (lymphocytic) (serous)
    • Choriomeningitis(acute) (lymphocytic) (serous)
    • Encephalitis(chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)
      • lymphatica
    • Lymphocytic
      • chorioencephalitis (acute) (serous)
    • Lymphocytic
      • choriomeningitis (acute) (serous)
    • Lymphocytic
      • meningoencephalitis
    • Meningitis(basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)
      • lymphocytic (acute) (benign) (serous)
    • Meningoencephalitis
      • lymphocytic (serous)

Clinical ClassificationClinical

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

CCSR NVS001
Meningitis
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR INF008
Viral infection
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Arenaviruses, Old World

    one of two groups of viruses in the arenavirus genus and considered part of the old world complex. it includes lassa virus and lymphocytic choriomeningitis virus, although the latter has worldwide distribution now.

  • Lymphocytic Choriomeningitis

    a form of meningitis caused by lymphocytic choriomeningitis virus. mice and other rodents serve as the natural hosts, and infection in humans usually occurs through inhalation or ingestion of infectious particles. clinical manifestations include an influenza-like syndrome followed by stiff neck, alterations of mentation, ataxia, and incontinence. maternal infections may result in fetal malformations and injury, including neonatal hydrocephalus, aqueductal stenosis, chorioretinitis, and microcephaly. (from joynt, clinical neurology, 1996, ch26, pp1-3)

  • Lymphocytic choriomeningitis virus

    the type species of arenavirus, part of the old world arenaviruses (arenaviruses, old world), producing a silent infection in house and laboratory mice. in humans, infection with lcmv can be inapparent, or can present with an influenza-like illness, a benign aseptic meningitis, or a severe meningoencephalomyelitis. the virus can also infect monkeys, dogs, field mice, guinea pigs, and hamsters, the latter an epidemiologically important host.

  • Lymphocytic Meningitis

    meningitis in which lymphocytes predominate in the cerebrospinal fluid.

Patient EducationClinical

Meningitis

Meningitis is inflammation of the thin tissue that surrounds the brain and spinal cord, called the meninges. There are several types of meningitis. The most common is viral meningitis. You get it when a virus enters the body through the nose or mouth and travels to the brain. Bacterial meningitis is rare but can be deadly.

Read the full article at MedlinePlus

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

Convert A87.2 to ICD-9-CMHistory

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

ICD-9-CM
049.0 Lymphocytic choriomening
Exact Match The mapping is direct, with no qualifiers.

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 A87.2Overview

Is A87.2 (Viral meningitis) a billable code?

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

What is the ICD-9 equivalent of A87.2?

Under the General Equivalence Mappings, lymphocytic choriomeningitis converts to ICD-9-CM 049.0 (lymphocytic choriomening). The mapping is a direct match.

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.