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I51.4 ICD-10-CA code: Myocarditis, unspecified

I51.4 is the ICD-10-CA code for “Myocarditis, unspecified” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

I51.4

Myocarditis, unspecified

Short description: Myocarditis unspecified

ICD-10-CA · Canada · Also written I514

Index terms

Entries in CIHI’s alphabetical index that lead to I51.4. Searching the index by the condition the note names is how coders reach this code.

  • Myofibrosis, heart
  • Fibrosis, fibrotic, heart
  • Fibrosis, fibrotic, cardiac
  • Fibroid (tumor), heart (disease)
  • Fibrosis, fibrotic, myocardium, myocardial
  • Disease, diseased, heart (organic) (senile), fibroid
  • Inflammation, inflamed, inflammatory (with exudation), myocardium
  • Myocarditis (chronic) (fibroid) (interstitial) (old) (progressive) (senile) (with arteriosclerosis)

Notes for I51.4

As CIHI prints them, with any note I51.4 takes from the headings above it.

Includes

  • Myocardial fibrosisMyocarditis:• NOS• chronic (interstitial)

Excludes

Conditions classified elsewhere.

  • Any condition in I51.4 - I51.9 due to hypertension (I11):• with renal disease (I13)complications following acute myocardial infarction (I23.-)when specified as rheumatic (I00-I09)From I51 Complications and ill-defined descriptions of heart disease
  • 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 I51.4 sits

  1. 1ChapterChapter 9: Diseases of the circulatory system (I00-I99)
  2. 2Block I30-I52Other forms of heart disease
  3. 3Category I51Complications and ill-defined descriptions of heart disease
  4. 4Valid code I51.4Myocarditis, 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.

See I51.4 in the CIHI source

Frequently asked questions

What does ICD-10-CA code I51.4 mean?

I51.4 is the ICD-10-CA code for “Myocarditis, unspecified” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is I51.4 in ICD-10-CA?

I51.4 sits under I51 Complications and ill-defined descriptions of heart disease, within I30-I52 Other forms of heart disease, within Chapter 9: Diseases of the circulatory system (I00-I99).

What coding notes apply to I51.4?

ICD-10-CA lists Includes, Excludes notes for I51.4, 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.

Codes beside I51.4

I51.0Cardiac septal defect, acquiredI51.1Rupture of chordae tendineae, not elsewhere classifiedI51.2Rupture of papillary muscle, not elsewhere classifiedI51.3Intracardiac thrombosis, not elsewhere classifiedI51.5Myocardial degenerationI51.6Cardiovascular disease, unspecifiedI51.7CardiomegalyI51.8Other ill-defined heart diseasesI51.9Heart disease, unspecified