Acute and subacute endocarditis (I33)

The ICD-10 codes I33, including I33.0 and I33.9, are used to classify acute and subacute forms of endocarditis, an infection or inflammation of the heart's inner lining and valves. These codes help identify cases of infective and unspecified endocarditis in medical records and billing.

I33.0 specifically covers acute and subacute infective endocarditis, also known by several synonyms such as acute bacterial endocarditis, vegetative endocarditis, and infective endocarditis of cardiac valves with vegetation. This code applies when the infection involves heart valves like the aortic, mitral, tricuspid, or pulmonary valves and may include complications like abscesses, embolism, or valve vegetations. It addresses infections caused by bacteria, fungi (e.g., blastomycosis), or rickettsial organisms, and is used for both native and prosthetic heart valves. People searching for the ICD-10 code for infective endocarditis will find this code relevant.

I33.9 is for acute and subacute endocarditis when the specific cause or infective agent is not known or unspecified. It also includes non-infective or myoendocarditis and related conditions like abscesses of cardiac septa or heart inflammation co-occurring with HIV infection. Coders use this code when clinical details are not sufficient to assign a more specific diagnosis.