2026 ICD-10-CM Diagnosis Code A52.01Syphilitic aneurysm of aorta

ICD-10-CM Codes›A00–B99›A50-A64›A52

ICD-10-CM A52.01
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A52.01 is a billable ICD-10-CM diagnosis code for syphilitic aneurysm of aorta. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 306 through 307. Coders also document this condition as syphilitic aneurysm. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Aortic; peripheral; and visceral artery aneurysms and Sexually transmitted infections (excluding HIV and hepatitis).

Code Identity

ICD-10-CM Code
A52.01
Billable Status
Yes — Valid for Submission
Code Describes
Syphilitic aneurysm of aorta
Short Description
Syphilitic aneurysm of aorta
Same as the full description in the CMS dataset.
Parent Code
A52.0
Cardiovascular and cerebrovascular syphilis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA50-A64Infections with a predominantly sexual mode of transmission
CategoryA52Late syphilis
This CodeA52.01Syphilitic aneurysm of aorta

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Syphilitic aneurysm
  • Syphilitic aneurysm of aorta

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.

    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • abdominal (aorta)
        • syphilitic
    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • aorta, aortic (nonsyphilitic)
        • syphilitic
    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • cylindroid (aorta)
        • syphilitic
    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • intrathoracic (nonsyphilitic)
        • syphilitic
    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • syphilitic (aorta)
    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • thoracoabdominal (aorta)
        • syphilitic
    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • thorax, thoracic (aorta) (arch) (nonsyphilitic)
        • syphilitic
    • Disease, diseased
      • heart (organic)
        • syphilitic
          • aortic
            • aneurysm
    • Rupture, ruptured
      • aorta, aortic
        • syphilitic
    • Syphilis, syphilitic(acquired)
      • aneurysm (aorta) (ruptured)
    • Syphilis, syphilitic(acquired)
      • aorta (arch) (abdominal) (thoracic)
        • aneurysm
    • Syphilis, syphilitic(acquired)
      • aortic (insufficiency) (regurgitation) (stenosis)
        • aneurysm
    • Syphilis, syphilitic(acquired)
      • dilatation, aorta

Clinical ClassificationClinical

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

CCSR CIR029
Aortic; peripheral; and visceral artery aneurysms
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

Aortic Aneurysm

An aneurysm is a bulge or "ballooning" in the wall of an artery. Arteries are blood vessels that carry oxygen-rich blood from the heart to other parts of the body. If an aneurysm grows large, it can burst and cause dangerous bleeding or even death.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert A52.01 to ICD-9-CMHistory

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

ICD-9-CM
093.0 Aortic aneurysm, syphil
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A52.01Overview

Is A52.01 (Cardiovascular and cerebrovascular syphilis) a billable code?

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

What MS-DRG does A52.01 group to?

When syphilitic aneurysm of aorta is the principal diagnosis on an inpatient stay, it groups to MS-DRG 306, 307, with relative weights from 0.9132 to 1.5758 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of A52.01?

Under the General Equivalence Mappings, syphilitic aneurysm of aorta converts to ICD-9-CM 093.0 (aortic aneurysm, syphil). The mapping is a direct match.

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.