ICD-10-CM Code I38

Endocarditis, valve unspecified

Version 2021 Billable Code

Valid for Submission

I38 is a billable code used to specify a medical diagnosis of endocarditis, valve unspecified. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code I38 might also be used to specify conditions or terms like abnormality of truncal valve cusp, abnormality of truncal valve cusp, abscess of left atrioventricular valve, abscess of right atrioventricular valve, acquired abnormality of left atrioventricular valve, acquired abnormality of right atrioventricular valve, etc

Short Description:Endocarditis, valve unspecified
Long Description:Endocarditis, valve unspecified

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code I38:


This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
  • endocarditis (chronic) NOS
  • valvular incompetence NOS
  • valvular insufficiency NOS
  • valvular regurgitation NOS
  • valvular stenosis NOS
  • valvulitis (chronic) NOS

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • congenital insufficiency of cardiac valve NOS Q24.8
  • congenital stenosis of cardiac valve NOS Q24.8
  • endocardial fibroelastosis I42.4
  • endocarditis specified as rheumatic I09.1

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code I38 are found in the index:

  • - Stricture - See Also: Stenosis;
    • - heart - See Also: Disease, heart;
      • - valve - See Also: Endocarditis; - I38


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Abnormality of truncal valve cusp
  • Abnormality of truncal valve cusp
  • Abscess of left atrioventricular valve
  • Abscess of right atrioventricular valve
  • Acquired abnormality of left atrioventricular valve
  • Acquired abnormality of right atrioventricular valve
  • Acquired cardiac septal defect
  • Acquired ventricular septal defect
  • Atrioventricular block due to endocarditis
  • Calcification of common atrioventricular valve
  • Calcification of left atrioventricular valve
  • Calcification of right atrioventricular valve
  • Calcification of truncal valve
  • Cardiac disease in pregnancy
  • Cardiac valve prolapse
  • Cardiovascular fistula due to endocarditis
  • Chronic endocarditis
  • Chronic valvulitis
  • Congestive heart failure due to valvular disease
  • Culture-negative endocarditis
  • Dilatation of left atrioventricular valve in double inlet ventricle
  • Dilatation of left atrioventricular valve annulus
  • Dilatation of right atrioventricular valve in double inlet ventricle
  • Dilatation of right atrioventricular valve annulus
  • Disorder of atrioventricular valve
  • Disorder of cardiac valve following procedure
  • Disorder of endocardium and heart valve
  • Disorder of left atrioventricular valve
  • Disorder of pulmonary valve prosthesis
  • Disorder of right atrioventricular valve
  • Endocarditis
  • Endocarditis as complication of procedure
  • Endocarditis associated with another disorder
  • Endocarditis of prosthetic pulmonary valve
  • Heart failure with reduced ejection fraction
  • Heart failure with reduced ejection fraction due to heart valve disease
  • Heart valve disorder
  • Heart valve regurgitation
  • Heart valve stenosis and regurgitation
  • Inflammation associated with cardiac implant
  • Mitral valve disorder in pregnancy
  • Myxoid transformation of cardiac valve
  • Myxomatous degeneration of left atrioventricular valve leaflet
  • Myxomatous degeneration of right atrioventricular valve leaflet
  • Nonbacterial thrombotic endocarditis
  • Noninfective endocarditis
  • Non-rheumatic heart valve disorder
  • Perforation of left atrioventricular valve leaflet
  • Perforation of right atrioventricular valve leaflet
  • Perforation of truncal valve cusp
  • Periendocarditis due to infection
  • Postcapillary pulmonary hypertension
  • Pulmonary hypertension due to left heart disease
  • Pulmonary hypertension due to left-sided valvular heart disease
  • Regurgitation of atrioventricular valve
  • Rupture of left atrioventricular valve leaflet
  • Rupture of right atrioventricular valve leaflet
  • Rupture of truncal valve cusp
  • Thrombosis of common atrioventricular valve
  • Thrombosis of left atrioventricular valve
  • Thrombosis of right atrioventricular valve
  • Thrombosis of truncal valve
  • Truncal valve abnormality
  • Valvular endocarditis
  • Valvular regurgitation
  • Valvular sclerosis
  • Ventricular septal defect due to and following infective endocarditis

Diagnostic Related Groups

The ICD-10 code I38 is grouped in the following groups for version MS-DRG V38.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2020 through 09/30/2021.


Convert I38 to ICD-9

  • 424.90 - Endocarditis NOS (Approximate Flag)
  • 424.99 - Endocarditis NEC (Approximate Flag)

Code Classification

  • Diseases of the circulatory system (I00–I99)
    • Other forms of heart disease (I30-I52)
      • Endocarditis, valve unspecified (I38)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

Information for Patients


Endocarditis, also called infective endocarditis (IE), is an inflammation of the inner lining of the heart. The most common type, bacterial endocarditis, occurs when germs enter your heart. These germs come through your bloodstream from another part of your body, often your mouth. Bacterial endocarditis can damage your heart valves. If untreated, it can be life-threatening. It is rare in healthy hearts.

Risk factors include having

  • An abnormal or damaged heart valve
  • An artificial heart valve
  • Congenital heart defects

The signs and symptoms of IE can vary from person to person. They also can vary over time in the same person. Symptoms you might notice include fever, shortness of breath, fluid buildup in your arms or legs, tiny red spots on your skin, and weight loss. Your doctor will diagnose IE based on your risk factors, medical history, signs and symptoms, and lab and heart tests.

Early treatment can help you avoid complications. Treatment usually involves high-dose antibiotics. If your heart valve is damaged, you may need surgery.

If you're at risk for IE, brush and floss your teeth regularly, and have regular dental checkups. Germs from a gum infection can enter your bloodstream. If you are at high risk, your doctor might prescribe antibiotics before dental work and certain types of surgery.

NIH: National Heart, Lung, and Blood Institute

  • Culture-negative endocarditis (Medical Encyclopedia)
  • Endocarditis (Medical Encyclopedia)
  • Endocarditis - children (Medical Encyclopedia)

[Learn More]

Heart Valve Diseases

Also called: Valvular heart disease

Your heart has four valves. Normally, these valves open to let blood flow through or out of your heart, and then shut to keep it from flowing backward. But sometimes they don't work properly. If they don't, you could have

  • Regurgitation - when blood leaks back through the valve in the wrong direction
  • Mitral valve prolapse - when one of the valves, the mitral valve, has "floppy" flaps and doesn't close tightly. It's one of the most common heart valve conditions. Sometimes it causes regurgitation.
  • Stenosis - when the valve doesn't open enough and blocks blood flow

Valve problems can be present at birth or caused by infections, heart attacks, or heart disease or damage. The main sign of heart valve disease is an unusual heartbeat sound called a heart murmur. Your doctor can hear a heart murmur with a stethoscope. But many people have heart murmurs without having a problem. Heart tests can show if you have a heart valve disease. Some valve problems are minor and do not need treatment. Others might require medicine, medical procedures, or surgery to repair or replace the valve.

NIH: National Heart, Lung, and Blood Institute

  • Aortic insufficiency (Medical Encyclopedia)
  • Aortic stenosis (Medical Encyclopedia)
  • Aortic valve surgery - minimally invasive (Medical Encyclopedia)
  • Aortic valve surgery - open (Medical Encyclopedia)
  • Bicuspid aortic valve (Medical Encyclopedia)
  • Heart murmurs and other sounds (Medical Encyclopedia)
  • Heart valve surgery (Medical Encyclopedia)
  • Transcatheter aortic valve replacement (Medical Encyclopedia)
  • Tricuspid regurgitation (Medical Encyclopedia)

[Learn More]