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I33

⚠ Non-billable (Header)

Acute and subacute endocarditis

Diseases of the circulatory system (I00-I99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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❌ Excludes1

direct

Cannot be coded with I33

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

Child Codes (2)

I33.0Acute and subacute infective endocarditisI33.9Acute and subacute endocarditis, unspecified

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Code Information

CodeI33
BillableNo — Header code
CategoryDiseases of the circulatory system (I00-I99)
Excludes12 rule(s)
Excludes20 note(s)
Child codes2

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)