ICD-10-CM 2027
ICD-10 code for syphilitic endocarditis
From the official ICD-10-CM alphabetic index entry “Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › syphilitic”. Page updated September 29, 2026.
About coding syphilitic endocarditis
The ICD-10-CM code for syphilitic endocarditis is A52.03 (Syphilitic endocarditis).
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.
Common questions about syphilitic endocarditis ICD-10 codes
What is the ICD-10 code for syphilitic endocarditis?
- 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.