I05.9

Billable
ChapterI00–I99
Ranksubcategory
Official Description

Rheumatic mitral valve disease, 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 mitral (valve) disorder (chronic) NOS
General instructions are available for the parent sections:
View CH9 NotesView I05 Notes

Clinical Hierarchy

CH9Diseases of the circulatory system (I00-I99)
I05-I09Chronic rheumatic heart diseases (I05-I09)
I05Rheumatic mitral valve diseases
I05.9Rheumatic mitral valve disease, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to I05.9:

categoryI05
Rheumatic mitral valve diseases
View context instructions
chapterCH9
Diseases of the circulatory system (I00-I99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to I05.9. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

6 raw paths
Disease, diseased2 unique routes
heart (organic)
mitral→I05.9
mitral (valve)→I05.9
Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular)2 unique routes
mitral (chronic) (double) (fibroid) (heart) (inactive) (valve) (with chorea)→I05.9(2 variants)
with
rheumatic fever (conditions in I00)
inactive or quiescent (with chorea)→I05.9
Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)1 unique routes
rheumatic (active) (acute) (chronic) (subacute)
inactive or quiescent with
endocarditis
mitral (valve)→I05.9
Lesion (s) (nontraumatic)1 unique routes
mitral→I05.9

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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