ICD-10-CM 2027
ICD-10 code for endocarditis syphilis
From the official ICD-10-CM alphabetic index entry “Syphilis, syphilitic (acquired) › endocarditis”. Page updated September 29, 2026.
About coding endocarditis syphilis
The ICD-10-CM code for endocarditis syphilis is A52.03 (Syphilitic endocarditis). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on A52.03.
Within A52.0 (cardiovascular and cerebrovascular syphilis), A52.03 is specifically for syphilitic endocarditis. Related codes cover cardiovascular syphilis, unspecified (A52.00), syphilitic aneurysm of aorta (A52.01), syphilitic aortitis (A52.02), 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 288 (Acute and Subacute Endocarditis with MCC, relative weight 2.6315), DRG 289 (Acute and Subacute Endocarditis with CC, relative weight 1.5362) and DRG 290 (Acute and Subacute Endocarditis without CC/MCC, relative weight 0.8367), 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 endocarditis syphilis codes (official index)
Common questions about endocarditis syphilis ICD-10 codes
What is the ICD-10 code for endocarditis syphilis?
- A52.03 — Syphilitic endocarditis. More specific codes apply when the documentation supports them: A52.03, A52.03.
What is the ICD-10 code for aortic endocarditis syphilis?
- A52.03 — Syphilitic endocarditis.
What is the ICD-10 code for pulmonary endocarditis syphilis?
- A52.03 — Syphilitic endocarditis.
Is A52.03 billable?
- Yes. A52.03 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A52.03 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A52.03 as a principal diagnosis.
Is A52.03 a CC or MCC?
- A52.03 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.