How Denials Work for Acute Care Hospitals: ED and Inpatient
Denials occur when a payer refuses to reimburse a hospital for services that were provided. In acute care settings, most denials arise from medical necessity, level of care determinations, or technical issues related to authorizations and documentation.
1. Where Denials Begin
In the Emergency Department (ED), denials often originate from decisions around whether a patient should be discharged, placed in observation, or admitted as inpatient. If the clinical documentation does not support the medical necessity of admission, payers may later deny or downgrade the claim.
2. The Admission and Level of Care Decision
Hospitals must assign the correct level of care at the point of admission. Payers review whether the documentation supports inpatient admission versus a lower-cost observation status. Errors at this stage, such as missing physician orders or insufficient evidence of severity, often result in medical necessity or level of care denials.
3. Concurrent Reviews During Hospitalization
Utilization Management (UM) staff send regular updates to payers to maintain authorization during a patient’s stay. If these reviews are missed or incomplete, payers can terminate authorization, resulting in denied days or reduced reimbursement.
4. Discharge and Claim Submission
Once the patient is discharged, the claim is submitted for payment. Payers re-evaluate the entire record to ensure the admission, continued stay, and discharge were justified. Any missing documentation, conflicting coding, or unsupported diagnoses can lead to retrospective denials.
5. Common Types of Denials in Acute Care
| Type | Description | Impact |
|---|---|---|
| Medical Necessity Denial | Payer determines that the admission or continued stay was not clinically justified. | Full or partial non-payment. |
| Level of Care Denial | Payer reclassifies inpatient stay to observation or lower level. | Reduced payment. |
| Technical/Administrative Denial | Late submission, missing authorization, or missing physician order. | Preventable, often recoverable. |
| Coding/Billing Denial | Documentation does not support billed diagnosis or DRG. | Requires correction or appeal. |
6. Financial Impact
Hospitals lose significant revenue from denials each year. The American Hospital Association reports that nearly 15% of hospital claims are initially denied, costing hospitals an estimated $19.7 billion annually in rework and lost reimbursement (AHA, 2024). Industry data show that average denial rates range between 6%–13%, and for inpatient medical necessity claims, the rate has risen from 2.4% to 3.2% over recent years (Definitive Healthcare, 2024; ACDIS, 2024).
A McBee Associates analysis found that approximately 84% of inpatient denials are due to medical necessity issues, 12% are technical, and 4% are related to readmissions. These denials take an average of 45–90 days to resolve and cost between $25–$118 per claim in administrative effort. Many hospitals recover only 25–30% of denied revenue due to limited appeal bandwidth.
7. Preventing and Addressing Denials
Hospitals can mitigate denials by ensuring timely authorizations, real-time documentation review, and proper application of InterQual or MCG criteria. When denials do occur, they can be overturned through peer-to-peer reviews and formal appeals that include clinical justification and regulatory references.
8. How bServed Helps
bServed’s 24/7 utilization management program embeds directly into the ED and inpatient workflow, addressing the root causes of denials in real time.
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Immediate Medical Necessity Reviews – Our nurse specialists perform real-time reviews during ED evaluation and at admission, using InterQual or MCG criteria to confirm inpatient or observation status before the order is placed. This prevents missed admissions and reduces future downgrades.
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Concurrent Authorization Management – bServed secures payer authorizations at admission and maintains them throughout the stay. Each payer’s timing and documentation requirements are tracked to ensure no lapse or missed submission. Our team provides concise, criteria-based updates that preserve coverage and prevent “timed-out” denials.
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Physician Collaboration and Level-of-Care Validation – We communicate directly with treating physicians, giving clear, criteria-based guidance when inpatient or observation status is borderline. The results of the Medical Necessity Review according to the established MCG or InterQual Criteria are documented to support compliance. If a case’s condition changes, we proactively update status with the care team to maintain payer alignment.
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Denial Defense and Appeals – When denials occur, bServed coordinates peer-to-peer reviews through its physician advisors and prepares written appeals supported by clinical data and regulatory citations. Every denial is tracked by reason, payer, and physician to identify trends and implement process corrections upstream.
Through these steps, bServed prevents denials before they occur, preserves hospital revenue, and relieves internal case managers of heavy administrative burden, allowing them to focus on patient care.
Sources
American Hospital Association (2024). Payer Denial Tactics: How to Confront a $20 Billion Problem. Retrieved from https://www.aha.org
McBee Associates (2024). Understanding and Preventing Inpatient Claim Denials: A Strategic Approach. Retrieved from https://mcbeeassociates.com
Definitive Healthcare (2024). The Rise of Claims Denials. Retrieved from https://www.definitivehc.com
ACDIS (2024). Commercial Payers’ Core Denial Rate Increases and Payment Delays. Retrieved from https://acdis.org
Centers for Medicare & Medicaid Services (CMS). Inpatient Hospital Reviews FAQs. Retrieved from https://www.cms.gov
EvidenceCare (2024). Denial Management in Healthcare. Retrieved from https://evidence.care