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Question: I’m reviewing a cardiology note for a 72-year-old established patient seen after an emergency department (ED) visit for shortness of breath, lower-extremity edema, and weight gain. The cardiologist documents congestive heart failure (CHF) with “acute decompensated CHF,” starts intravenous (IV) diuresis, and notes the patient has a history of heart failure with reduced ejection fraction (HFrEF), with a recent echo showing ejection fraction (EF) of 30 percent. The assessment also says “acute on chronic systolic heart failure.” Should I report unspecified CHF, or can I use a more specific heart failure code based on the HFrEF and acute-on-chronic wording?

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Answer: For ICD-10-CM coding, heart failure specificity generally relies on two documentation elements: the physiologic type and the acuity. ICD-10-CM classifies HFrEF with systolic heart failure and heart failure with preserved ejection fraction (HFpEF) with diastolic heart failure when documented by the provider. Acuity includes acute, chronic, or acute on chronic.

“CHF” does not identify systolic, diastolic, combined, right-sided, or other specific heart failure. But in your scenario, the cardiologist provided specificity beyond “CHF,” as the assessment documents “acute on chronic systolic heart failure.” The documented history of HFrEF is consistent with the provider’s diagnosis of systolic heart failure, but the code assignment is supported by the provider’s documented type and acuity. That specificity allows you to bypass I50.9 (Heart failure, unspecified).

The note documents both the type of heart failure, systolic/HFrEF, and the acuity — acute on chronic. In this case, the stronger choice is I50.23 (Acute on chronic systolic [congestive] heart failure).

As a general note, make sure the final code reflects provider-documented acuity, not just symptoms such as edema or dyspnea. If the note only says “CHF exacerbation” without clarifying systolic, diastolic, combined, acute, chronic, or acute on chronic status, query the provider. Coders shouldn’t infer the type of heart failure from an EF value alone unless the provider has linked that clinical information to a documented diagnosis.

Rachel Dorrell, MA, MS, CPC-A, CPPM, Production Editor, AAPC