Myocarditis, unspecified
- I51.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- The 2025 edition of ICD-10-CM I51.4 became effective on October 1, 2024.
- This is the American ICD-10-CM version of I51.4 – other international versions of ICD-10 I51.4 may differ.
Applicable To
- Chronic (interstitial) myocarditis
- Myocardial fibrosis
- Myocarditis NOS
Type 1 Excludes
- acute or subacute myocarditis (I40.-)
The following code(s) above I51.4 contain annotation back-references
that may be applicable to I51.4:
- I00-I99 Diseases of the circulatory system
- I51 Complications and ill-defined descriptions of heart disease
Approximate Synonyms
- Chronic myocarditis
- Hypersensitivity myocarditis
- Influenza a with myocarditis
- Influenza, avian with myocarditis
- Myocarditis
- Myocarditis (heart muscle inflammation), chronic
- Myocarditis due to avian influenza
- Myocarditis due to hypersensitivity state
- Myocarditis due to influenza a
- Myocarditis due to radiation
- Radiation myocarditis
Clinical Information
- A disorder characterized by inflammation of the muscle tissue of the heart.
- Inflammation of the heart muscle
- Inflammation of the muscle tissue of the heart.
- Inflammation of the muscular walls of the heart.
- Inflammatory processes of the muscular walls of the heart (myocardium) which result in injury to the cardiac muscle cells (myocytes, cardiac). Manifestations range from subclinical to sudden death (death, sudden). Myocarditis in association with cardiac dysfunction is classified as inflammatory cardiomyopathy usually caused by infection, autoimmune diseases, or responses to toxic substances. Myocarditis is also a common cause of dilated cardiomyopathy and other cardiomyopathies.
ICD-10-CM I51.4 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):
- 314 Other circulatory system diagnoses with mcc
- 315 Other circulatory system diagnoses with cc
- 316 Other circulatory system diagnoses without cc/mcc
Convert I51.4 to ICD-9-CMCode 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
- 2024 (effective 10/1/2023): No change
- 2025 (effective 10/1/2024): No change
Code annotations containing back-references to I51.4:
Diagnosis Index entries containing back-references to I51.4:
- Acardiotrophia I51.4
- Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification) I70.90
- myocarditis I51.4
- Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) I51.4