All ICD10 Codes
I33Not billable, use a more specific code below

Acute and subacute endocarditis

In Other forms of heart disease (I30-I5A), chapter 9: Diseases of the Circulatory System

2 billable codes under I33: all are an MCC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.

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Instructional notes

Excludes1: not coded here, use a different code

  • acute rheumatic endocarditis (I01.1)
  • endocarditis NOS (I38)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers hypertension with heart and kidney disease, coronary artery disease with angina, perioperative stroke, cerebrovascular sequelae, and acute myocardial infarction types and timing.

Read Section I.C.9 (page 50)

All codes under I33

I33 can't be used on a claim. Pick a billable code below; grey headings group them.

I33 MS-DRGs

As the principal diagnosis, all 2 billable codes under I33 group to these 8 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

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).

Read more about endocarditis on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.