Billable / Specific Code
ICD-10-CM I09.1 is the diagnosis code for Rheumatic diseases of endocardium, valve unspecified. This code falls under the section "Chronic rheumatic heart diseases" within Chapter 9 — Diseases of the circulatory system (I00-I99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as I09.1. They are mutually exclusive:
Understanding where I09.1 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, I09.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
I09.1 is the ICD-10-CM diagnosis code for "Rheumatic diseases of endocardium, valve unspecified". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of I09.1 is I09 ("Other rheumatic heart diseases"). I09.1 provides a more specific classification within this category.
I09.1 is located in Section I05-I09 — "Chronic rheumatic heart diseases" within Chapter 9 of the ICD-10-CM Tabular List.
I09.1 has 1918 sub-code(s) that provide more specific detail: A00, A01, A02, A03, A04 and more.
Use I09.1 when the patients documented diagnosis matches "Rheumatic diseases of endocardium, valve unspecified" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Rheumatic diseases of endocardium, valve unspecified is I09.1.
Yes, I09.1 can be used as a primary diagnosis code since it is billable and specific.
I09.1 is in Chapter 9 of the ICD-10-CM Tabular List.
Type 1 Excludes for I09.1 include: endocarditis, valve unspecified (I38).
Yes, I09.1 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.