I09.1

Billable
ChapterI00–I99
Ranksubcategory
Official Description

Rheumatic diseases of endocardium, valve unspecified

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 9: Diseases of the Circulatory System (I00-I99).

Instructional Notes

Includes
  • Rheumatic endocarditis (chronic)
  • Rheumatic valvulitis (chronic)
Excludes1(Not coded here)
  • endocarditis, valve unspecified (I38)
General instructions are available for the parent sections:
View CH9 Notes

Clinical Hierarchy

CH9Diseases of the circulatory system (I00-I99)
I05-I09Chronic rheumatic heart diseases (I05-I09)
I09Other rheumatic heart diseases
I09.1Rheumatic diseases of endocardium, valve unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to I09.1:

chapterCH9
Diseases of the circulatory system (I00-I99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to I09.1. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

3 raw paths
Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular)2 unique routes
rheumatic (chronic) (inactive) (with chorea)→I09.1
with rheumatic fever (conditions in I00)
inactive or quiescent (with chorea)→I09.1
Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)1 unique routes
rheumatic (active) (acute) (chronic) (subacute)
inactive or quiescent with
endocarditis→I09.1

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 306
Cardiac Congenital and Valvular Disorders with MCC
DRG 307
Cardiac Congenital and Valvular Disorders without MCC

Cross Reference

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