2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A87.2 is a billable ICD-10-CM diagnosis code for lymphocytic choriomeningitis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 75 through 76. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 59 closely related codes. 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A87.2: its own notes plus those printed at A87, block A80-A89, and Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Lymphocytic meningoencephalitis

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From A87 Viral meningitis applies to 5 codes
  • meningitis due to herpesvirus [herpes simplex] (B00.3)
  • meningitis due to herpesvirus [herpes simplex] (B00.3)
  • meningitis due to measles virus (B05.1)
  • meningitis due to mumps virus (B26.1)
  • meningitis due to poliomyelitis virus (A80.-)
  • meningitis due to zoster (B02.1)
From Block A80-A89 Viral and prion infections of the central nervous system applies to 48 codes
  • postpolio syndrome (G14)
  • sequelae of poliomyelitis (B91)
  • sequelae of viral encephalitis (B94.1)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name A87.2, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming A87.2: they are not reported together with it, unless the two conditions are unrelated.

  • A85 Other viral encephalitis, not elsewhere classified
    lymphocytic choriomeningitis (A87.2)

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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

  • 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)

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A87.2Overview

What is the ICD-10 code for lymphocytic choriomeningitis?

The ICD-10-CM code for lymphocytic choriomeningitis is A87.2 (sometimes written as A872). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

What MS-DRG does A87.2 group to?

When lymphocytic choriomeningitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 75, 76, with relative weights from 0.8672 to 1.7699 depending on complications. Higher weights mean higher Medicare reimbursement.

Is A87.2 a CC or MCC?

CMS lists A87.2 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 59 closely related codes in its exclusion list.

Can A87.2 be reported with B00.3?

Not as a rule. The Excludes1 note at A87, which applies to A87.2, lists "meningitis due to herpesvirus [herpes simplex] (B00.3)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).