I33.9
Billable
ChapterI00–I99
Ranksubcategory
Official Description
Acute and subacute endocarditis, unspecified
Metadata & Insights
- •2026 ICD-10-CM Edition - Effective October 1, 2025.
- •Billable/specific code (valid for reimbursement).
- •Chapter 9: Diseases of the Circulatory System (I00-I99).
Instructional Notes
Includes
- Acute endocarditis NOS
- Acute myoendocarditis NOS
- Acute periendocarditis NOS
- Subacute endocarditis NOS
- Subacute myoendocarditis NOS
- Subacute periendocarditis NOS
General instructions are available for the parent sections:
Clinical Hierarchy
Applicable Ancestor Context
The following parent sections contain instructions or notes that apply to I33.9:
Alphabetic Index Mentions
These are Diagnosis Index lookup paths that route to I33.9. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.
6 raw paths
MS-DRG Classification
This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:
Cross Reference
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