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Cardiology billing is riskier than patients think. Why? Single visits may have multiple codes (such as diagnostic testing, interventional procedures, and chronic disease management), and a code for a stress test or catheterization could include a code for a chronic disease management procedure without being noticed by the reader or being denied. Cardiology billing services require coders who pay attention to these combinations because the lack of attention to a single detail in a high-cost cardiac procedure can cost a lot more than the same oversight in a routine office visit.