2019 ICD-10-CM Diagnosis Code I51.4

Myocarditis, unspecified

    2016 2017 2018 2019 Billable/Specific Code
  • I51.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2019 edition of ICD-10-CM I51.4 became effective on October 1, 2018.
  • 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
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 I51.4. 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 or subacute myocarditis (
    ICD-10-CM Diagnosis Code I40
    • I40 Acute myocarditis
      • I40.0 Infective myocarditis
      • I40.1 Isolated myocarditis
      • I40.8 Other acute myocarditis
      • I40.9 Acute myocarditis, unspecified
    I40.-
    )
The following code(s) above I51.4 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 I51.4:
  • I00-I99
    2019 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
  • I51
    ICD-10-CM Diagnosis Code I51

    Complications and ill-defined descriptions of heart disease

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 1 Excludes
    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 v36.0):
  • 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-CM

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
Code annotations containing back-references to I51.4:
  • Type 1 Excludes: I09.0
    , I51
    , I51
    ICD-10-CM Diagnosis Code I09.0

    Rheumatic myocarditis

      2016 2017 2018 2019 Billable/Specific Code
    Type 1 Excludes
    • myocarditis not specified as rheumatic (I51.4)
    ICD-10-CM Diagnosis Code I51

    Complications and ill-defined descriptions of heart disease

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 1 Excludes
    ICD-10-CM Diagnosis Code I51

    Complications and ill-defined descriptions of heart disease

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 1 Excludes
  • Includes: I11
    ICD-10-CM Diagnosis Code I11

    Hypertensive heart disease

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Includes

Diagnosis Index entries containing back-references to I51.4:
  • Acardiotrophia I51.4
  • Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification) I70.90
    ICD-10-CM Diagnosis Code I70.90

    Unspecified atherosclerosis

      2016 2017 2018 2019 Billable/Specific Code Adult Dx (15-124 years)
    • myocarditis I51.4
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) I51.4

ICD-10-CM Codes Adjacent To I51.4
I50.82 Biventricular heart failure
I50.83 High output heart failure
I50.84 End stage heart failure
I50.89 Other heart failure
I50.9 Heart failure, unspecified
I51 Complications and ill-defined descriptions of heart disease
I51.0 Cardiac septal defect, acquired
I51.1 Rupture of chordae tendineae, not elsewhere classified
I51.2 Rupture of papillary muscle, not elsewhere classified
I51.3 Intracardiac thrombosis, not elsewhere classified
I51.4 Myocarditis, unspecified
I51.5 Myocardial degeneration
I51.7 Cardiomegaly
I51.8 Other ill-defined heart diseases
I51.81 Takotsubo syndrome
I51.89 Other ill-defined heart diseases
I51.9 Heart disease, unspecified
I52 Other heart disorders in diseases classified elsewhere
I60 Nontraumatic subarachnoid hemorrhage
I60.0 Nontraumatic subarachnoid hemorrhage from carotid siphon and bifurcation
I60.00 Nontraumatic subarachnoid hemorrhage from unspecified carotid siphon and bifurcation

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