2027 ICD-10-CM Diagnosis Code A32.12Listerial meningoencephalitis
ICD-10-CM Codes›A00–B99›A30-A49›A32
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
A32.12 is a billable ICD-10-CM diagnosis code for listerial meningoencephalitis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 867 through 869. 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 14 closely related codes. Coders also document this condition as bacterial meningoencephalitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Encephalitis.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Bacterial meningoencephalitis
- Listeria cerebritis
- Listeria meningitis
- Listeria meningitis caused by Listeria monocytogenes
- Listeria meningoencephalitis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A32.12: its own notes plus those printed at A32 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.
- listerial foodborne infection
- diseases generally recognized as communicable or transmissible
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
- 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.
- 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 A32.12, its category, or a range that includes it.
Excludes1 2
These codes carry an Excludes1 note naming A32.12: they are not reported together with it, unless the two conditions are unrelated.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) G04.90
listeriosis A32.12
Meningoencephalitis See Also: Encephalitis; G04.90
Listeria monocytogenes A32.12
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Listeriosis
infections with bacteria of the genus listeria.
Patient EducationClinical
Encephalitis
Encephalitis is inflammation (swelling) of the brain. It can happen when an infection or medical condition that affects the brain activates your immune system. The inflammation can cause a wide range of symptoms. In extreme cases, it can lead to brain damage, stroke, or even death.
The full article covers:
- What is encephalitis?
- What causes encephalitis?
- Who is more likely to get encephalitis?
- What are the symptoms of encephalitis?
- How is encephalitis diagnosed?
- What are the treatments for encephalitis?
- Can encephalitis be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert A32.12 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A32.12Overview
What is the ICD-10 code for listerial meningoencephalitis?
The ICD-10-CM code for listerial meningoencephalitis is A32.12 (sometimes written as A3212). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is A32.12 (Listerial meningitis and meningoencephalitis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report listerial meningoencephalitis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does A32.12 group to?
When listerial meningoencephalitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 869, 868, with relative weights from 0.6784 to 2.1855 depending on complications. Higher weights mean higher Medicare reimbursement.
Is A32.12 a CC or MCC?
CMS lists A32.12 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 14 closely related codes in its exclusion list.
Can A32.12 be reported with P37.2?
Not as a rule. The Excludes1 note at A32, which applies to A32.12, lists "neonatal (disseminated) listeriosis (P37.2)". 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).
