In simple words: Inflammation of the pericardium (the sac surrounding the heart) due to acute rheumatic fever.

Acute rheumatic pericarditis. Any condition in I00 with pericarditis. Rheumatic pericarditis (acute).

Example 1: A patient presents with chest pain, fever, and friction rub on auscultation. After a thorough evaluation, including echocardiography and blood tests, the diagnosis of acute rheumatic pericarditis is confirmed. The patient has a history of recent streptococcal infection., A child with a history of acute rheumatic fever develops chest pain and shortness of breath. Examination reveals muffled heart sounds and an enlarged cardiac silhouette on chest X-ray. The patient is diagnosed with acute rheumatic pericarditis with effusion., A young adult presents with fever, joint pain, and a new heart murmur. Echocardiography shows evidence of valvulitis and pericardial effusion. Based on the clinical picture and supporting laboratory findings, a diagnosis of acute rheumatic fever with pericarditis is established.

Documentation should include evidence of a preceding streptococcal infection, clinical findings such as chest pain, friction rub, and muffled heart sounds, as well as supporting laboratory and imaging studies like echocardiography.

** Excludes1: acute pericarditis not specified as rheumatic (I30.-)