I30-I52: Other forms of heart disease
I40: Acute myocarditis
Acute myocarditis is an inflammation of the heart muscle, specifically, the myocardium. It's most commonly caused by viral infections, but it can also result from bacterial, fungal or parasitic infections, allergic reactions to medications or toxins, and autoimmune diseases. People with acute myocarditis might feel like they have a heavy cold or flu, with symptoms such as fatigue, shortness of breath, rapid or irregular heartbeats, and chest pain. It can progress quickly or slowly, affecting the heart's ability to pump and causing fluid buildup in the lungs or rest of the body if left untreated. While many recover fully, severe cases can lead to life-threatening complications such as heart failure. This condition primarily affects the cardiovascular system.
Patient Disclaimer
The information provided on this page is for general educational purposes only. It is not intended for self-diagnosis and does not replace professional medical advice. Always consult your doctor or a qualified healthcare provider with any questions or concerns about your health.
If you see an ICD diagnosis code (e.g., on a medical report), be aware that doctors may also include additional indicators to express diagnostic certainty. Only a healthcare professional can interpret these codes accurately in the context of your individual case.
For a complete understanding of your condition and what the diagnosis means for you, please speak directly with your doctor.