I50.21
BillableAcute systolic (congestive) heart failure
HCC Category Mapping
V28HCC 225 — Acute Heart Failure
0.000V24HCC 85 — Congestive Heart Failure
0.368ESRDHCC 85 — Congestive Heart Failure
0.000RxHCCHCC 186 — Heart Failure
0.000What This Code Means
A sudden worsening of heart function where the heart's left chamber cannot pump blood effectively to the body, causing fluid buildup in the lungs and tissues.
Coding Tips
- •Verify documentation specifies 'acute' onset to distinguish from chronic systolic heart failure
- •Look for clinical indicators such as recent hospitalization, acute decompensation, or new onset symptoms within days to weeks
Clinical Significance
Acute systolic congestive heart failure represents a sudden onset or rapid worsening of systolic dysfunction requiring urgent medical intervention. These patients typically present with acute pulmonary edema, respiratory distress, and hemodynamic instability. The acute designation indicates higher acuity care needs and often correlates with hospital admission.
Documentation Requirements
- ✓Provider must explicitly document 'acute' systolic heart failure or acute decompensation of systolic function
- ✓Clinical indicators of acuity: acute pulmonary edema, new onset dyspnea, rapid weight gain, hypoxia
- ✓Ejection fraction demonstrating reduced systolic function
- ✓Precipitating factors such as medication noncompliance, dietary indiscretion, ischemia, or arrhythmia
- ✓Treatment response including intravenous diuretics, vasodilators, or inotropic support
- ✓Distinction from acute on chronic — this code implies no pre-existing chronic heart failure
Commonly Confused Codes
I50.23 — Acute on chronic systolic heart failure: use when the patient has pre-existing chronic heart failure with acute worseningI50.22 — Chronic systolic heart failure: use when the condition is long-standing without acute exacerbationI50.20 — Unspecified systolic heart failure: less specific, does not indicate acuityI50.31 — Acute diastolic heart failure: diastolic involves impaired relaxation with preserved ejection fractionJ81.0 — Acute pulmonary edema: a manifestation of heart failure, not a substitute for the heart failure code
Code Hierarchy
└I50Heart failure└I50.2Systolic (congestive) heart failure└I50.21Acute systolic (congestive) heart failure
└I50.21Acute systolic (congestive) heart failure