Is I33 a billable code?
No. I33 is a header code that groups 2 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
I33: Acute and subacute endocarditis
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
I33 groups related diagnoses under acute and subacute endocarditis. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under I33
I33 questions
What does I33 mean?
I33 is the ICD-10-CM code for Acute and subacute endocarditis. It is in chapter 9, Diseases of the circulatory system (I00-I99).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.