2027 ICD-10-CM Diagnosis Code I38Endocarditis, valve unspecified
ICD-10-CM Codes›I00–I99›I30-I5A›I38
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Chronic Condition
I38 is a billable ICD-10-CM diagnosis code for endocarditis, valve unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 306 through 307, 791, 793. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 8 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Endocarditis and endocardial disease.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Abnormality of right atrioventricular valve in double inlet ventricle
- Abnormality of truncal valve cusp
- Abscess of left atrioventricular valve
- Abscess of right atrioventricular valve
- Acquired abnormality of common atrioventricular valve following procedure
- Acquired abnormality of common atrioventricular valve following repair of biventricular atrioventricular connection
- Acquired abnormality of congenital malformed heart valve following repair
- Acquired abnormality of left atrioventricular valve
- Acquired abnormality of left atrioventricular valve following repair of double inlet ventricle
- Acquired abnormality of right atrioventricular valve
- Acquired abnormality of right atrioventricular valve following repair of double inlet ventricle
- Acquired common atrioventricular valve regurgitation following procedure
- Acquired regurgitation of common atrioventricular valve following repair of biventricular connection
- Acquired regurgitation of left ventricular component of common atrioventricular valve following repair of biventricular connection
- Acquired regurgitation of right ventricular component of common atrioventricular valve following repair of biventricular connection
- Acquired stenosis of common atrioventricular valve following repair of biventricular connection
- Acquired stenosis of left ventricular component of common atrioventricular valve following repair of biventricular connection
- Acquired stenosis of right ventricular component of common atrioventricular valve following repair of biventricular connection
- Acquired ventricular septal defect
- Atrial fibrillation due to heart valve disorder
- 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 valve prolapse
- Cardiovascular fistula due to endocarditis
- Chronic endocarditis
- Chronic valvulitis
- Common atrioventricular valve stenosis
- 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 annulus
- Dilation of right atrioventricular valve in double inlet ventricle
- Disorder of atrioventricular valve
- Disorder of cardiac valve following procedure
- 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 normal ejection fraction
- 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
- Left ventricular failure with normal ejection fraction due to valvular heart disease
- 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
- Paroxysmal atrial fibrillation
- Paroxysmal atrial fibrillation due to heart valve disorder
- Perforation of left atrioventricular valve leaflet
- Perforation of right atrioventricular valve leaflet
- Perforation of truncal valve cusp
- Periendocarditis due to infection
- Permanent atrial fibrillation
- Permanent atrial fibrillation due to heart valve disorder
- Persistent atrial fibrillation
- Persistent atrial fibrillation due to heart valve disorder
- Postcapillary pulmonary hypertension
- Postprocedural common atrioventricular valvar stenosis
- Pulmonary hypertension due to left heart disease
- Pulmonary hypertension due to left-sided valvular heart disease
- Regurgitation of atrioventricular valve
- Regurgitation of common atrioventricular valve
- Regurgitation of left atrioventricular valve
- Regurgitation of right atrioventricular valve
- Right ventricular failure due to valvular heart disease
- Rupture of left atrioventricular valve leaflet
- Rupture of right atrioventricular valve leaflet
- Rupture of truncal valve cusp
- Stenosis of truncal valve following procedure
- Thrombosis of common atrioventricular valve
- Thrombosis of left atrioventricular valve
- Thrombosis of right atrioventricular valve
- Thrombosis of truncal valve
- Truncal valve abnormality
- Truncal valve stenosis
- Valvular endocarditis
- Valvular regurgitation
- Valvular sclerosis
- Vegetation of heart
- Vegetative endocarditis
- Vegetative endocarditis without infection
- Ventricular septal defect due to and following infective endocarditis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I38: its own notes plus those printed at Chapter 9. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives 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
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name I38, its category, or a range that includes it.
Excludes1 3
These codes carry an Excludes1 note naming I38: they are not reported together with it, unless the two conditions are unrelated.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disease, diseased See Also: Syndrome;
valve, valvular I38
heart (idiopathic) See Also: Hypertrophy, cardiac;
valve See Also: Endocarditis; I38
Stenosis, stenotic (cicatricial) See Also: Stricture;
heart valve See Also: Endocarditis; I38
valve (cardiac) (heart) See Also: Endocarditis; I38
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Endocarditis
inflammation of the inner lining of the heart (endocardium), the continuous membrane lining the four chambers and heart valves. it is often caused by microorganisms including bacteria, viruses, fungi, and rickettsiae. left untreated, endocarditis can damage heart valves and become life-threatening.
Patient EducationClinical
Endocarditis
Endocarditis is sometimes called infective endocarditis. It's a rare but life-threatening inflammation of the lining inside your heart's chambers and valves (the endocardium).
The full article covers:
- What is endocarditis?
- What causes endocarditis?
- Who is more likely to develop endocarditis?
- What are the symptoms of endocarditis?
- What other problems can endocarditis cause?
- How is endocarditis diagnosed?
- What are the treatments for endocarditis?
- Can endocarditis be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert I38 to ICD-9-CMHistory
Code HistoryHistory
Questions About I38Overview
What is the ICD-10 code for endocarditis, valve unspecified?
The ICD-10-CM code for endocarditis, valve unspecified is I38. It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is I38 (Endocarditis, valve unspecified) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report endocarditis, valve unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I38 group to?
When endocarditis, valve unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 306, 793, 791, 307, with relative weights from 0.9146 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is I38 a CC or MCC?
CMS lists I38 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 8 closely related codes in its exclusion list.
Can I38 be reported with Q24.8?
Not as a rule. The Excludes1 note on I38 lists "congenital insufficiency of cardiac valve NOS (Q24.8)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
