2026 ICD-10-CM Diagnosis Code A52.13Late syphilitic meningitis

ICD-10-CM Codes›A00–B99›A50-A64›A52

ICD-10-CM A52.13
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A52.13 is a billable ICD-10-CM diagnosis code for late syphilitic meningitis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as late quaternary neurosyphilis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Meningitis and Sexually transmitted infections (excluding HIV and hepatitis).

Code Identity

ICD-10-CM Code
A52.13
Billable Status
Yes — Valid for Submission
Code Describes
Late syphilitic meningitis
Short Description
Late syphilitic meningitis
Same as the full description in the CMS dataset.
Parent Code
A52.1
Symptomatic neurosyphilis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA50-A64Infections with a predominantly sexual mode of transmission
CategoryA52Late syphilis
This CodeA52.13Late syphilitic meningitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Late quaternary neurosyphilis
  • Meningitis caused by Spirochaetes
  • Meningovascular syphilis - quaternary stage
  • Syphilitic meningitis

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.

    • Meningitis(basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)
      • in (due to)
        • neurosyphilis (late)
    • Meningitis(basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)
      • syphilitic (late) (tertiary)
    • Neurosyphilis(arrested) (early) (gumma) (late) (latent) (recurrent) (relapse)
      • arachnoid (adhesive)
    • Neurosyphilis(arrested) (early) (gumma) (late) (latent) (recurrent) (relapse)
      • dura (mater)
    • Neurosyphilis(arrested) (early) (gumma) (late) (latent) (recurrent) (relapse)
      • leptomeninges (aseptic)
    • Neurosyphilis(arrested) (early) (gumma) (late) (latent) (recurrent) (relapse)
      • meningeal, meninges (adhesive)
    • Neurosyphilis(arrested) (early) (gumma) (late) (latent) (recurrent) (relapse)
      • meningitis
    • Neurosyphilis(arrested) (early) (gumma) (late) (latent) (recurrent) (relapse)
      • meningovascular (diffuse)
    • Syphilis, syphilitic(acquired)
      • arachnoid (adhesive) (cerebral) (spinal)
    • Syphilis, syphilitic(acquired)
      • cerebral
        • meningovascular
    • Syphilis, syphilitic(acquired)
      • dura mater
    • Syphilis, syphilitic(acquired)
      • meninges (adhesive) (brain) (spinal cord)
    • Syphilis, syphilitic(acquired)
      • meningitis
    • Syphilis, syphilitic(acquired)
      • meningovascular

Clinical ClassificationClinical

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

CCSR NVS001
Meningitis
Default principal diagnosis: inpatient No · outpatient No
CCSR INF010
Sexually transmitted infections (excluding HIV and hepatitis)
Default principal diagnosis: inpatient Yes · outpatient Yes

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 A52.13 to ICD-9-CMHistory

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

ICD-9-CM
094.2 Syphilitic meningitis
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 A52.13Overview

Is A52.13 (Symptomatic neurosyphilis) a billable code?

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

What is the ICD-9 equivalent of A52.13?

Under the General Equivalence Mappings, late syphilitic meningitis converts to ICD-9-CM 094.2 (syphilitic meningitis). 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.