A52.13 Late syphilitic meningitis

The ICD-10-CM code for Late syphilitic meningitis is A52.13 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

1: Certain infectious and parasitic diseases (A00-B99)

Section

A50-A64: Infections with a predominantly sexual mode of transmission (A50-A64)

Category A52

34 codes (30 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to A52.13:

• Neurosyphilis (arrested) (early) (gumma) (late) (latent) (recurrent) (relapse) › leptomeninges (aseptic)
• Neurosyphilis (arrested) (early) (gumma) (late) (latent) (recurrent) (relapse) › meningitis
• Neurosyphilis (arrested) (early) (gumma) (late) (latent) (recurrent) (relapse) › meningovascular (diffuse)
• 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) › meningeal, meninges (adhesive)
• Syphilis, syphilitic (acquired) › arachnoid (adhesive) (cerebral) (spinal)
• Neurosyphilis (arrested) (early) (gumma) (late) (latent) (recurrent) (relapse) › dura (mater)

U.S. Hospital Utilization

• An estimated 105 U.S. inpatient stays in 2023 included A52.13 among the documented diagnoses.
• 55 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

HIV Infections (TOC entry)

a. Human Immunodeficiency Virus (HIV) Infections .............................................................. 19

Infectious agents causing diseases in other chapters (TOC)

b. Infectious agents as the cause of diseases classified to other chapters ................................. 22

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)