ICD-10-CM 2027
ICD-10 code for aneurysm syphilis
From the official ICD-10-CM alphabetic index entry “Syphilis, syphilitic (acquired) › aneurysm (aorta) (ruptured)”. Page updated September 29, 2026.
About coding aneurysm syphilis
The ICD-10-CM code for aneurysm syphilis is A52.01 (Syphilitic aneurysm of aorta). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on A52.01.
Within A52.0 (cardiovascular and cerebrovascular syphilis), A52.01 is specifically for syphilitic aneurysm of aorta. Related codes cover cardiovascular syphilis, unspecified (A52.00), syphilitic aortitis (A52.02), syphilitic endocarditis (A52.03), syphilitic cerebral arteritis (A52.04), other cerebrovascular syphilis (A52.05), other syphilitic heart involvement (A52.06) and other cardiovascular syphilis (A52.09).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 306 (Cardiac Congenital and Valvular Disorders with MCC, relative weight 1.546) and DRG 307 (Cardiac Congenital and Valvular Disorders without MCC, relative weight 0.9148), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific aneurysm syphilis codes (official index)
Common questions about aneurysm syphilis ICD-10 codes
What is the ICD-10 code for aneurysm syphilis?
- A52.01 — Syphilitic aneurysm of aorta. More specific codes apply when the documentation supports them: A52.05, A50.54.
What is the ICD-10 code for central nervous system aneurysm syphilis?
- A52.05 — Other cerebrovascular syphilis.
What is the ICD-10 code for congenital aneurysm syphilis?
- A50.54 — Late congenital cardiovascular syphilis.
Is A52.01 billable?
- Yes. A52.01 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A52.01 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A52.01 as a principal diagnosis.
Is A52.01 a CC or MCC?
- A52.01 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.