Infusing Needed Iron to Target Insufficiency in Adults Treated for Evidence of Heart Failure

Inclusion Criteria: Adults (age \>18 years); Diagnosed heart failure with most recent left ventricular ejection fraction \<50%; Hospitalized for any reason for the index admission; Documented iron deficiency defined as TSAT \<20% during the index hospitalization; At least 6 months of health plan coverage and prescription drug benefit before admission Exclusion Criteria: A documented allergy to IV iron in the Kaiser Permanente Northern California (KPNC) electronic health record (EHR) system; A history of hemochromatosis (i.e., iron overload) based on KPNC EHR data; End-stage kidney disease (defined as receiving chronic dialysis or a prior kidney transplant) or advanced chronic kidney disease (i.e., estimated glomerular filtration rate \[eGFR\] \<30 mL/min/1.73 m2) based on most recent pre-admission outpatient laboratory results or the KPNC regional End-Stage Kidney Disease Treatment Registry; Serum ferritin \>300 ng/mL based on KPNC EHR data; Diagnosed with metastatic cancer and/or receiving systemic chemotherapy based on KPNC EHR data; Institutionalized (e.g., prison) and/or receiving palliative care per KPNC EHR data