ICD-10-CM Diagnosis Code (2025)
Official Description for I33
Acute and subacute endocarditis
Coding Notes & Guidelines for I33
Excludes1: Not Coded Here
- acute rheumatic endocarditis (I01.1)
- endocarditis NOS (I38)
Use Additional Code
code (B95-B97) to identify infectious agent
Inclusion Terms
- Bacterial endocarditis (acute) (subacute)
- Infective endocarditis (acute) (subacute) NOS
- Endocarditis lenta (acute) (subacute)
- Malignant endocarditis (acute) (subacute)
- Purulent endocarditis (acute) (subacute)
- Septic endocarditis (acute) (subacute)
- Ulcerative endocarditis (acute) (subacute)
- Vegetative endocarditis (acute) (subacute)
Inclusion Terms
- Acute endocarditis NOS
- Acute myoendocarditis NOS
- Acute periendocarditis NOS
- Subacute endocarditis NOS
- Subacute myoendocarditis NOS
- Subacute periendocarditis NOS
Child Codes (More Specific Codes for I33):
About ICD-10-CM Code I33 (Acute and subacute endocarditis)
ICD-10-CM code I33 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM I33 became effective on October 1, 2024.
This page provides detailed information about I33 - Acute and subacute endocarditis. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Acute and subacute endocarditis.