I40 ICD-10-CA category: Acute myocarditis

I40 isn’t a code on its own. Choose one of the 4 codes beneath it, the one the documentation supports.

Official description

I40

Acute myocarditis

ICD-10-CA · Canada

Codes in I40

I40 isn’t a code on its own. Open the code that matches what the note documents.

I40.0Infective myocarditis I40.1Isolated myocarditis I40.8Other acute myocarditis I40.9Acute myocarditis, unspecified

Notes for I40

As CIHI prints them, with any note I40 takes from the headings above it.

Excludes

Conditions classified elsewhere.

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 I40 sits

1ChapterChapter 9: Diseases of the circulatory system (I00-I99)
2Block I30-I52Other forms of heart disease
3Category I40Acute myocarditis

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.

See I40 in the CIHI source

Frequently asked questions

Is I40 a valid ICD-10-CA code?

No. I40 (Acute myocarditis) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 4 codes; record the one the documentation supports.

Where is I40 in ICD-10-CA?

I40 sits under I30-I52 Other forms of heart disease, within Chapter 9: Diseases of the circulatory system (I00-I99).

What coding notes apply to I40?

ICD-10-CA lists Excludes notes for I40, 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.

View I30-I52