I33.9 – Acute and subacute endocarditis, unspecified
ICD-10-CM 2027 diagnosis code · Other forms of heart disease
ICD-10-CM code
I33.9
- Code
I33.9(claims format:I339)- Description
- Acute and subacute endocarditis, unspecified
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 9. Diseases of the circulatory system (I00-I99)
- Block
- I30-I5A Other forms of heart disease
- Parent codes
- I33
Notes for I33.9
Applicable to:
- Acute endocarditis NOS
- Acute myoendocarditis NOS
- Acute periendocarditis NOS
- Subacute endocarditis NOS
- Subacute myoendocarditis NOS
- Subacute periendocarditis NOS
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
I33 – Acute and subacute endocarditis
Index terms for I33.9
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in I33
Frequently asked questions
What is ICD-10 code I33.9?
I33.9 is the ICD-10-CM code for acute and subacute endocarditis, unspecified, in the block I30-I5A (Other forms of heart disease).
Is I33.9 a billable code?
Yes. I33.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does I33.9 belong to?
It belongs to category I33 – Acute and subacute endocarditis.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.