2026 ICD-10-CM Diagnosis Code I08.1Rheumatic disorders of both mitral and tricuspid valves

ICD-10-CM Codes›I00–I99›I05-I09›I08

ICD-10-CM I08.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I08.1 is a billable ICD-10-CM diagnosis code for rheumatic disorders of both mitral and tricuspid valves. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 306 through 307. Coders also document this condition as disorders of both mitral and tricuspid valves. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Chronic rheumatic heart disease.

Code Identity

ICD-10-CM Code
I08.1
Billable Status
Yes — Valid for Submission
Code Describes
Rheumatic disorders of both mitral and tricuspid valves
Short Description
Rheumatic disorders of both mitral and tricuspid valves
Same as the full description in the CMS dataset.
Parent Code
I08
Multiple valve diseases

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI05-I09Chronic rheumatic heart diseases
CategoryI08Multiple valve diseases
This CodeI08.1Rheumatic disorders of both mitral and tricuspid valves

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Disorders of both mitral and tricuspid valves

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Endocarditis(chronic) (marantic) (nonbacterial) (thrombotic) (valvular)
      • mitral (chronic) (double) (fibroid) (heart) (inactive) (valve) (with chorea)
        • with
          • tricuspid (valve) disease
    • Endocarditis(chronic) (marantic) (nonbacterial) (thrombotic) (valvular)
      • tricuspid (chronic) (heart) (inactive) (rheumatic) (valve) (with chorea)
        • with
          • mitral (valve) disease
    • Insufficiency, insufficient
      • mitral (valve)
        • with
          • tricuspid (valve) disease
    • Insufficiency, insufficient
      • mitral (valve)
        • rheumatic
          • with
            • tricuspid (valve) disease
    • Insufficiency, insufficient
      • tricuspid (valve) (rheumatic)
        • with
          • mitral (valve) disease
    • Stenosis, stenotic(cicatricial)
      • tricuspid (valve)
        • with
          • mitral (valve) disease

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR CIR001
Chronic rheumatic heart disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Heart Valve Diseases

Heart valve disease happens when one or more of your heart valves don't work well.

The full article covers:

  • What are heart valve diseases?
  • What are the types of heart valve diseases?
  • What causes heart valve diseases?
  • Who is more likely to develop heart valve diseases?
  • What are the symptoms of heart valve diseases?
  • What other problems can heart valve diseases cause?
  • How is heart valve disease diagnosed?
  • What are the treatments for heart valve diseases?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert I08.1 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
397.9 Rheum endocarditis NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I08.1Overview

Is I08.1 (Multiple valve diseases) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report rheumatic disorders of both mitral and tricuspid valves on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I08.1 group to?

When rheumatic disorders of both mitral and tricuspid valves is the principal diagnosis on an inpatient stay, it groups to MS-DRG 306, 307, with relative weights from 0.9132 to 1.5758 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of I08.1?

Under the General Equivalence Mappings, rheumatic disorders of both mitral and tricuspid valves converts to ICD-9-CM 397.9 (rheum endocarditis NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.