I09.1
✓ Billable
Rheumatic diseases of endocardium, valve unspecified
ICD-10-CM · FY2026 · Diseases of the Circulatory System
Code
I09.1
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Circulatory System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code I09.1?
ICD-10-CM code I09.1 represents Rheumatic diseases of endocardium, valve unspecified. It is a billable diagnosis code in the Diseases of the Circulatory System chapter, effective October 1, 2025 – September 30, 2026.
Is I09.1 billable?
Yes. I09.1 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is I09.1 in?
I09.1 belongs to the Diseases of the Circulatory System chapter (I00–I99) of ICD-10-CM.
Related codes in the I09 category
I09
Other rheumatic heart diseases
Non-billable
I09.0
Rheumatic myocarditis
Billable
I09.2
Chronic rheumatic pericarditis
Billable
I09.8
Other specified rheumatic heart diseases
Non-billable
I09.9
Rheumatic heart disease, unspecified
Billable
I09.81
Rheumatic heart failure
Billable
I09.89
Other specified rheumatic heart diseases
Billable
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