I33.9 ICD-10-CA code: Acute endocarditis, unspecified
I33.9 is the ICD-10-CA code for “Acute endocarditis, unspecified” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
I33.9Acute endocarditis, unspecified
Short description: Acute endocarditis unspecified
ICD-10-CA · Canada · Also written I339
Index terms
Entries in CIHI’s alphabetical index that lead to I33.9. Searching the index by the condition the note names is how coders reach this code.
- Endocarditis (chronic) (nonbacterial) (thrombotic) (valvular), toxic
- Endocarditis (chronic) (nonbacterial) (thrombotic) (valvular), acute or subacute
- Endocarditis (chronic) (nonbacterial) (thrombotic) (valvular), pulmonary (chronic) (heart) (valve), acute or subacute
- Endocarditis (chronic) (nonbacterial) (thrombotic) (valvular), aortic (heart) (nonrheumatic) (valve), acute or subacute
- Endocarditis (chronic) (nonbacterial) (thrombotic) (valvular), tricuspid (chronic) (heart) (inactive) (rheumatic) (valve) (with chorea), nonrheumatic, acute or subacute
- Endocarditis (chronic) (nonbacterial) (thrombotic) (valvular), mitral (chronic) (double) (fibroid) (heart) (inactive) (valve) (with chorea), nonrheumatic, acute or subacute
Notes for I33.9
As CIHI prints them, with any note I33.9 takes from the headings above it.
Includes
- Endocarditis, Myoendocarditis, Periendocarditis — acute or subacute
Excludes
Conditions classified elsewhere.
- Acute rheumatic endocarditis (I01.1)endocarditis NOS (I38)From I33 Acute and subacute endocarditis
- Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)systemic connective tissue disorders (M30-M36)transient cerebral ischaemic attacks and related syndromes (G45.-)From Chapter 9: Diseases of the circulatory system (I00-I99)
Where I33.9 sits
- 1ChapterChapter 9: Diseases of the circulatory system (I00-I99)
- 2Block I30-I52Other forms of heart disease
- 3Category I33Acute and subacute endocarditis
- 4Valid code I33.9Acute endocarditis, unspecified
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code I33.9 mean?
I33.9 is the ICD-10-CA code for “Acute endocarditis, unspecified” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is I33.9 in ICD-10-CA?
I33.9 sits under I33 Acute and subacute endocarditis, within I30-I52 Other forms of heart disease, within Chapter 9: Diseases of the circulatory system (I00-I99).
What coding notes apply to I33.9?
ICD-10-CA lists Includes, Excludes notes for I33.9, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.