2026 ICD-10-CM Diagnosis Code A52.03Syphilitic endocarditis
ICD-10-CM Codes›A00–B99›A50-A64›A52
- Billable — Valid for Submission
- Chronic Condition
A52.03 is a billable ICD-10-CM diagnosis code for syphilitic endocarditis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 288 through 290. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Endocarditis and endocardial disease and Sexually transmitted infections (excluding HIV and hepatitis).
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Infective endocarditis of aortic valve
- Infective endocarditis of mitral valve
- Infective endocarditis of pulmonary valve
- Inflammation of aortic valve
- Late syphilitic pulmonary regurgitation
- Syphilis of mitral valve
- Syphilis of pulmonary valve
- Syphilis of tricuspid valve
- Syphilitic aortic stenosis
- Syphilitic endocarditis
- Syphilitic endocarditis of aortic valve
- Syphilitic endocarditis of mitral valve
- Syphilitic endocarditis of pulmonary valve
- Syphilitic endocarditis of tricuspid valve
- Syphilitic valve disease
- Syphilitic valvular endocarditis
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Syphilitic aortic valve incompetence or stenosis
- Syphilitic mitral valve stenosis
- Syphilitic pulmonary valve regurgitation
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Disease, diseased - See Also: Syndrome;
- coronary (artery) - See: Disease, heart, ischemic, atherosclerotic;
- heart (organic) - I51.9
- syphilitic - A52.06
- aortic - A52.03
- Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) - I38
- aortic (heart) (nonrheumatic) (valve) - I35.8
- syphilitic - A52.03
- pulmonary (chronic) (heart) (valve) - I37.8
- syphilitic - A52.03
- syphilitic - A52.03
- aortic (valve) - I35.1
- syphilitic - A52.03
- Regurgitation - R11.10
- pulmonary (valve) (heart) - I37.1
- syphilitic - A52.03
- Stenosis, stenotic (cicatricial) - See Also: Stricture;
- aortic (valve) - I35.0
- syphilitic - A52.03
- mitral (chronic) (inactive) (valve) - I05.0
- syphilitic - A52.03
- Syphilis, syphilitic (acquired) - A53.9
- aortic (insufficiency) (regurgitation) (stenosis) - A52.03
- endocarditis - A52.03
- heart (block) (decompensation) (disease) (failure) - A52.06
- valve NEC - A52.03
- mitral stenosis - A52.03
- valvulitis NEC - A52.03
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Disease, diseased
- coronary (artery)
- ostial, syphilitic (aortic) (mitral) (pulmonary)
- Disease, diseased
- heart (organic)
- syphilitic
- aortic
- Endocarditis(chronic) (marantic) (nonbacterial) (thrombotic) (valvular)
- aortic (heart) (nonrheumatic) (valve)
- syphilitic
- Endocarditis(chronic) (marantic) (nonbacterial) (thrombotic) (valvular)
- pulmonary (chronic) (heart) (valve)
- syphilitic
- Endocarditis(chronic) (marantic) (nonbacterial) (thrombotic) (valvular)
- syphilitic
- Insufficiency, insufficient
- aortic (valve)
- syphilitic
- Regurgitation
- pulmonary (valve) (heart)
- syphilitic
- Stenosis, stenotic(cicatricial)
- aortic (valve)
- syphilitic
- Stenosis, stenotic(cicatricial)
- mitral (chronic) (inactive) (valve)
- syphilitic
- Syphilis, syphilitic(acquired)
- aortic (insufficiency) (regurgitation) (stenosis)
- Syphilis, syphilitic(acquired)
- endocarditis
- Syphilis, syphilitic(acquired)
- endocarditis
- aortic
- Syphilis, syphilitic(acquired)
- endocarditis
- pulmonary
- Syphilis, syphilitic(acquired)
- heart (block) (decompensation) (disease) (failure)
- valve NEC
- Syphilis, syphilitic(acquired)
- mitral stenosis
- Syphilis, syphilitic(acquired)
- valvulitis NEC
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Endocarditis
Endocarditis is sometimes called infective endocarditis. It's a rare but life-threatening inflammation of the lining inside your heart's chambers and valves (the endocardium).
The full article covers:
- What is endocarditis?
- What causes endocarditis?
- Who is more likely to develop endocarditis?
- What are the symptoms of endocarditis?
- What other problems can endocarditis cause?
- How is endocarditis diagnosed?
- What are the treatments for endocarditis?
- Can endocarditis be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert A52.03 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A52.03Overview
Is A52.03 (Cardiovascular and cerebrovascular syphilis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report syphilitic endocarditis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does A52.03 group to?
When syphilitic endocarditis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 288, 289, 290, with relative weights from 0.9297 to 2.7062 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of A52.03?
Under the General Equivalence Mappings, syphilitic endocarditis converts to ICD-9-CM 093.20 (syphil endocarditis NOS), 093.21 (syphilitic mitral valve), and 093.22 (syphilitic aortic valve). The mapping is approximate, so confirm the match fits the documentation.
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.
