A52.05 Other cerebrovascular syphilis

The ICD-10-CM code for Other cerebrovascular syphilis is A52.05 (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 A52.05:

• Neurosyphilis (arrested) (early) (gumma) (late) (latent) (recurrent) (relapse) › aneurysm (cerebral)
• Syphilis, syphilitic (acquired) › cerebrovascular
• Angiopathia, angiopathy › retinae syphilitica
• Neurosyphilis (arrested) (early) (gumma) (late) (latent) (recurrent) (relapse) › thrombosis (cerebral)
• Neurosyphilis (arrested) (early) (gumma) (late) (latent) (recurrent) (relapse) › hemorrhagic
• Neurosyphilis (arrested) (early) (gumma) (late) (latent) (recurrent) (relapse) › vascular (cerebral) NEC
• Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › central nervous system, syphilitic
• Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › brain › syphilitic (hemorrhage)

Inclusion Terms

• Syphilitic cerebral aneurysm (ruptured) (non-ruptured)
• Syphilitic cerebral thrombosis

U.S. Hospital Utilization

A52.05 appeared in too few sampled U.S. inpatient stays in 2023 to report a national estimate (AHRQ suppresses counts of 10 or fewer) — a rare inpatient 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)