ICD-10-CM 2027
ICD-10 code for pulmonary endocarditis
From the official ICD-10-CM alphabetic index entry “Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › pulmonary (chronic) (heart) (valve)”. Page updated September 29, 2026.
About coding pulmonary endocarditis
The ICD-10-CM code for pulmonary endocarditis is I37.8 (Other nonrheumatic pulmonary valve disorders). The official index lists 11 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I37.8.
Within I37, choose I37.8 (Other nonrheumatic pulmonary valve disorders) only when documentation doesn't support a more specific option: nonrheumatic pulmonary valve stenosis (I37.0), nonrheumatic pulmonary valve insufficiency (I37.1), nonrheumatic pulmonary valve stenosis with insufficiency (I37.2) and nonrheumatic pulmonary valve disorder, unspecified (I37.9).
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 pulmonary endocarditis codes (official index)
- with rheumatic fever (conditions in I00)
- active
- inactive or quiescent (with chorea) I09.89 — Other specified rheumatic heart diseases
- with aortic, mitral or tricuspid disease I08.8 — Other rheumatic multiple valve diseases
- acute or subacute I33.9 — Acute and subacute endocarditis, unspecified
- rheumatic I01.1 — Acute rheumatic endocarditis
- with chorea (acute) (rheumatic) (Sydenham's) I02.0 — Rheumatic chorea with heart involvement
- arteriosclerotic I37.8 — Other nonrheumatic pulmonary valve disorders
- congenital Q22.2 — Congenital pulmonary valve insufficiency
- rheumatic (chronic) (inactive) (with chorea) I09.89 — Other specified rheumatic heart diseases
- active or acute I01.1 — Acute rheumatic endocarditis
- with chorea (acute) (rheumatic) (Sydenham's) I02.0 — Rheumatic chorea with heart involvement
- syphilitic A52.03 — Syphilitic endocarditis
Common questions about pulmonary endocarditis ICD-10 codes
What is the ICD-10 code for pulmonary endocarditis?
- I37.8 — Other nonrheumatic pulmonary valve disorders. More specific codes apply when the documentation supports them: I09.89, I08.8, I33.9, I01.1 and others below.
What is the ICD-10 code for acute or subacute pulmonary endocarditis?
- I33.9 — Acute and subacute endocarditis, unspecified.
What is the ICD-10 code for arteriosclerotic pulmonary endocarditis?
- I37.8 — Other nonrheumatic pulmonary valve disorders.
What is the ICD-10 code for congenital pulmonary endocarditis?
- Q22.2 — Congenital pulmonary valve insufficiency.
What is the ICD-10 code for rheumatic pulmonary endocarditis?
- I09.89 — Other specified rheumatic heart diseases.
What is the ICD-10 code for syphilitic pulmonary endocarditis?
- A52.03 — Syphilitic endocarditis.
Is I37.8 billable?
- Yes. I37.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I37.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I37.8 as a principal diagnosis.
Is I37.8 a CC or MCC?
- No. I37.8 is neither a CC nor an MCC under MS-DRG v44.0.