BACKGROUND AND OBJECTIVE:Treating envenomation with antivenom is costly. Many patients being treated with antivenom are in observation status, a billing designation for patients considered to need care that is less resourceintensive, and less expensive, than inpatient care. Observation status is also associated with lower hospital reimbursements and higher patient cost-sharing. The goal of this study was to examine resource utilization for treatment of envenomation under observation and inpatient status, and to compare patients in observation status receiving antivenom with all other patients in observation status.
METHODS:This was a retrospective study of patients with a primary diagnosis of toxic effect of venom seen during 2009 at 33 freestanding children's hospitals in the Pediatric Health Information System. Data on age, length of stay, adjusted costs (ratio cost to charges), ICU fl ags, and antivenom utilization were collected. Comparisons were conducted according to admission status (emergency department only, observation status, and inpatient status), and between patients in observation status receiving antivenom and patients in observation status with other diagnoses.
RESULTS:A total of 2755 patients had a primary diagnosis of toxic effect of venom. Of the 335 hospitalized, either under observation (n = 124) or inpatient (n = 211) status, 107 (31.9%) received antivenom. Of those hospitalized patients receiving antivenom, 24 (22.4%) were designated as observation status. Costs were substantially higher for patients who received antivenom and were driven by pharmacy costs (mean cost: $17 665 for observation status, $20 503 for inpatient status). Mean costs for the 47 162 patients in observation status with other diagnoses were $3001 compared with $17 665 for observation-status patients who received antivenom. 6-8 However, few studies have addressed the treatment burden associated with envenomation cases or the impact of the designated medical service type on resource utilization and costs.
CONCLUSIONS:The Centers for Medicare & Medicaid Services (CMS) coined the term "observation status" to describe patients not meeting inpatient Diagnosis Related Group criteria and deemed by payers to be in a state of clinical decisionmaking between discharge-to-home and admission-to-inpatient status.
9They defined the care a patient receives while in observation status as a set of services delivered "before a decision can be made regarding whether patients will require further treatment as hospital inpatients or if they are able to be discharged from the hospital."10 Because patients in observation status have not officially been admitted to the hospital, the care they receive in emergency departments (EDs) or in the hospital is considered outpatient care and is commonly reimbursed at lower rates than care provided to patients with an inpatient status, as observation-status care is presumed to be less resourceintensive.11 Antivenom treatments followed by ongoing care (including being observed for complications)...