Acute and subacute endocarditis, unspecified

This code represents an inflammatory condition affecting the inner lining of the heart chambers and heart valves, characterized by a rapid onset and progression, but without specific documentation of the underlying cause (e.g., bacterial, fungal). It encompasses both acute and subacute forms of endocarditis when the etiology is not specified.

Use this code when the medical record clearly documents a diagnosis of acute or subacute endocarditis, but the specific infectious agent or other cause has not been identified or is not documented. This is appropriate for initial presentations or when diagnostic workup for the causative organism is incomplete or inconclusive.

• Avoid using this code if a specific infectious organism (e.g., bacterial, fungal) is identified; instead, code to the more specific endocarditis code that includes the organism.
• Always review documentation for any mention of the type of endocarditis (e.g., infective, non-infective) or the specific valve affected, as more precise codes may be available.
• Consider sequencing this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis when it is a co-morbidity.