2023 ICD-10-CM Diagnosis Code I40

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Acute myocarditis

    2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
  • I40 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2023 edition of ICD-10-CM I40 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of I40 - other international versions of ICD-10 I40 may differ.
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as I40. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • acute rheumatic myocarditis (
    ICD-10-CM Diagnosis Code I01.2

    Acute rheumatic myocarditis

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
    Applicable To
    • Any condition in I00 with myocarditis
Includes Help
"Includes" further defines, or give examples of, the content of the code or category.
  • subacute myocarditis
The following code(s) above I40 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to I40:
  • I00-I99
    2023 ICD-10-CM Range I00-I99

    Diseases of the circulatory system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    • systemic connective tissue disorders (M30-M36)
    • transient cerebral ischemic attacks and related syndromes (G45.-)
    Diseases of the circulatory system
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
Code annotations containing back-references to I40:
  • Code Also: M35.81
    ICD-10-CM Diagnosis Code M35.81

    Multisystem inflammatory syndrome

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
    Applicable To
    • MIS-A
    • MIS-C
    • Multisystem inflammatory syndrome in adults
    • Multisystem inflammatory syndrome in children
    • Pediatric inflammatory multisystem syndrome
    • PIMS
    Code First
    • , if applicable, COVID-19 (U07.1)
    Code Also
    • any associated complications such as:
    • acute hepatic failure (K72.0-)
    • acute kidney failure (N17.-)
    • acute myocarditis (I40.-)
    • acute respiratory distress syndrome (J80)
    • cardiac arrhythmia (I47-I49.-)
    • pneumonia due to COVID-19 (J12.82)
    • severe sepsis (R65.2-)
    • viral cardiomyopathy (B33.24)
    • viral pericarditis (B33.23)
    Use Additional
    • code, if applicable, for:
    • exposure to COVID-19 or SARS-CoV-2 infection (Z20.822)
    • personal history of COVID-19 (Z86.16)
    • post COVID-19 condition (U09.9)
  • Code First: I5A
    ICD-10-CM Diagnosis Code I5A

    Non-ischemic myocardial injury (non-traumatic)

      2022 - New Code 2023 Billable/Specific Code
    Applicable To
    • Acute (non-ischemic) myocardial injury
    • Chronic (non-ischemic) myocardial injury
    • Unspecified (non-ischemic) myocardial injury
    Code First
    • the underlying cause, if known and applicable, such as:
    • acute kidney failure (N17.-)
    • acute myocarditis (I40.-)
    • cardiomyopathy (I42.-)
    • chronic kidney disease (CKD) (N18.-)
    • heart failure (I50.-)
    • hypertensive urgency (I16.0)
    • nonrheumatic aortic valve disorders (I35.-)
    • paroxysmal tachycardia (I47.-)
    • pulmonary embolism (I26.-)
    • pulmonary hypertension (I27.0, I27.2-)
    • sepsis (A41.-)
    • takotsubo syndrome (I51.81)
    Type 1 Excludes
    • acute myocardial infarction (I21.-)
    • injury of heart (S26.-)
    Type 2 Excludes
    • other acute ischemic heart diseases (I24.-)
  • Type 1 Excludes: I51.4
    ICD-10-CM Diagnosis Code I51.4

    Myocarditis, unspecified

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
    Applicable To
    • Chronic (interstitial) myocarditis
    • Myocardial fibrosis
    • Myocarditis NOS
    Type 1 Excludes
    • acute or subacute myocarditis (I40.-)
ICD-10-CM Codes Adjacent To I40
I36.8 Other nonrheumatic tricuspid valve disorders
I36.9 Nonrheumatic tricuspid valve disorder, unspecified
I37 Nonrheumatic pulmonary valve disorders
I37.0 Nonrheumatic pulmonary valve stenosis
I37.1 Nonrheumatic pulmonary valve insufficiency
I37.2 Nonrheumatic pulmonary valve stenosis with insufficiency
I37.8 Other nonrheumatic pulmonary valve disorders
I37.9 Nonrheumatic pulmonary valve disorder, unspecified
I38 Endocarditis, valve unspecified
I39 Endocarditis and heart valve disorders in diseases classified elsewhere
I40 Acute myocarditis
I40.0 Infective myocarditis
I40.1 Isolated myocarditis
I40.8 Other acute myocarditis
I40.9 Acute myocarditis, unspecified
I41 Myocarditis in diseases classified elsewhere
I42 Cardiomyopathy
I42.0 Dilated cardiomyopathy
I42.1 Obstructive hypertrophic cardiomyopathy
I42.2 Other hypertrophic cardiomyopathy
I42.3 Endomyocardial (eosinophilic) disease

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.