ICD-10-CM 2027
ICD-10 code for aortic endocarditis
From the official ICD-10-CM alphabetic index entry “Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › aortic (heart) (nonrheumatic) (valve)”. Page updated September 29, 2026.
About coding aortic endocarditis
The ICD-10-CM code for aortic endocarditis is I35.8 (Other nonrheumatic aortic valve disorders). The official index lists 19 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I35.8.
Within I35, choose I35.8 (Other nonrheumatic aortic valve disorders) only when documentation doesn't support a more specific option: nonrheumatic aortic (valve) stenosis (I35.0), nonrheumatic aortic (valve) insufficiency (I35.1), nonrheumatic aortic (valve) stenosis with insufficiency (I35.2) and nonrheumatic aortic valve disorder, unspecified (I35.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
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 aortic endocarditis codes (official index)
- with
- mitral disease I08.0 — Rheumatic disorders of both mitral and aortic valves
- with tricuspid (valve) disease I08.3 — Combined rheumatic disorders of mitral, aortic and tricuspid valves
- active or acute I01.1 — Acute rheumatic endocarditis
- with chorea (acute) (rheumatic) (Sydenham's) I02.0 — Rheumatic chorea with heart involvement
- rheumatic fever (conditions in I00)
- active
- inactive or quiescent (with chorea) I06.9 — Rheumatic aortic valve disease, unspecified
- tricuspid (valve) disease I08.2 — Rheumatic disorders of both aortic and tricuspid valves
- with mitral (valve) disease I08.3 — Combined rheumatic disorders of mitral, aortic and tricuspid valves
- acute or subacute I33.9 — Acute and subacute endocarditis, unspecified
- arteriosclerotic I35.8 — Other nonrheumatic aortic valve disorders
- rheumatic I06.9 — Rheumatic aortic valve disease, unspecified
- with mitral disease I08.0 — Rheumatic disorders of both mitral and aortic valves
- with tricuspid (valve) disease I08.3 — Combined rheumatic disorders of mitral, aortic and tricuspid valves
- active or acute I01.1 — Acute rheumatic endocarditis
- with chorea (acute) (rheumatic) (Sydenham's) I02.0 — Rheumatic chorea with heart involvement
- active or acute I01.1 — Acute rheumatic endocarditis
- with chorea (acute) (rheumatic) (Sydenham's) I02.0 — Rheumatic chorea with heart involvement
- specified NEC I06.8 — Other rheumatic aortic valve diseases
- specified cause NEC I35.8 — Other nonrheumatic aortic valve disorders
- syphilitic A52.03 — Syphilitic endocarditis
Common questions about aortic endocarditis ICD-10 codes
What is the ICD-10 code for aortic endocarditis?
- I35.8 — Other nonrheumatic aortic valve disorders. More specific codes apply when the documentation supports them: I08.0, I08.3, I01.1, I02.0 and others below.
What is the ICD-10 code for acute or subacute aortic endocarditis?
- I33.9 — Acute and subacute endocarditis, unspecified.
What is the ICD-10 code for arteriosclerotic aortic endocarditis?
- I35.8 — Other nonrheumatic aortic valve disorders.
What is the ICD-10 code for rheumatic aortic endocarditis?
- I06.9 — Rheumatic aortic valve disease, unspecified.
What is the ICD-10 code for syphilitic aortic endocarditis?
- A52.03 — Syphilitic endocarditis.
Is I35.8 billable?
- Yes. I35.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I35.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I35.8 as a principal diagnosis.
Is I35.8 a CC or MCC?
- No. I35.8 is neither a CC nor an MCC under MS-DRG v44.0.