Emergency department (ED) coding denials can create significant challenges for hospitals, particularly when a payer changes the reimbursement associated with a submitted emergency department evaluation and management (E/M) level.
These situations can become particularly complex when the payer uses its own reimbursement methodology or automated claims-analysis system to evaluate the level of service.
One historical example involved an Aetna provider communication concerning CPT 99285, while UnitedHealthcare (UHC) later introduced an ED reimbursement policy involving level 4 and level 5 E/M services and the Optum Emergency Department Claim (EDC) Analyzer.
For hospitals, the central issue is not simply whether a claim was reduced. It is understanding how the payer determined the adjustment, whether the methodology is consistent with the applicable agreement and coding guidance, and what documentation supports the level of service reported.
Why Emergency Department Coding Denials Matter
ED services can involve significant variation in patient acuity, diagnostic testing, treatment, monitoring, staffing, and facility resources.
A claim may therefore require a detailed review when a payer changes the reported E/M level.
Common issues associated with ED coding denials include:
- Level-of-care downcoding
- CPT 99285 reimbursement reductions
- CPT 99284 reimbursement disputes
- Medical necessity denials
- Payer-specific reimbursement policies
- Automated claims-analysis systems
- Documentation concerns
- Diagnosis and resource-utilization differences
- Contractual payment disputes
Hospitals should distinguish between coding, payment policy, and medical necessity because these issues can involve different review and appeal considerations.
Aetna and Emergency Department Downcoding
A historical Aetna OfficeLink Update stated that, beginning December 1, 2016, certain claims submitted with CPT 99285 and designated minor diagnosis codes would be downcoded to CPT 99284.
The communication provided examples such as constipation, earaches, and colds but did not provide a complete list of the diagnosis codes included in the policy.
For a hospital, this type of policy raises several questions:
- What diagnosis codes are subject to the policy?
- How does the payer determine the appropriate E/M level?
- Is the adjustment based on coding or reimbursement policy?
- Does the provider contract address the payer’s methodology?
- What appeal rights apply?
- Does the payer’s methodology account for the facility resources involved?
These questions should be reviewed against the applicable payer contract and current policy rather than assumed from a historical payer communication.
UnitedHealthcare and ED Level-of-Care Policies
UnitedHealthcare subsequently introduced policies addressing reimbursement for facility claims containing ED E/M codes, including 99284/G0383 and 99285/G0384.
The policy described the use of the Optum Emergency Department Claim (EDC) Analyzer to determine a calculated emergency department visit level for certain facility claims.
According to the policy framework described in the original article, the analyzer considers factors including:
- Presenting problems
- Diagnostic services performed
- Patient complexity and comorbidities
The policy also identifies circumstances under which certain claims may be excluded from adjustment.
For hospitals, understanding the methodology behind an automated level-of-care adjustment is important when determining whether a claim should be appealed.
How the EDC Analyzer Evaluates ED Claims
The EDC methodology described in the source material uses multiple claim-level inputs to calculate an ED visit level.
1. Presenting Problems
The patient’s presenting problem is associated with the diagnosis information reported on the claim.
However, the initial reason for an ED visit does not necessarily capture the full complexity of the patient’s evaluation.
For example, a patient may arrive with a relatively common symptom but subsequently require extensive diagnostic testing, monitoring, treatment, consultation, or transfer.
Therefore, hospitals should review the complete clinical and resource-utilization picture when evaluating a disputed ED level.
2. Diagnostic Services
The methodology also considers diagnostic services reported on the claim.
These may include categories such as:
- Laboratory testing
- X-rays
- EKGs
- CT scans
- MRI
- Ultrasound
- Other diagnostic services
The important question for a hospital is whether the methodology sufficiently represents the actual resources and complexity associated with the encounter.
3. Patient Complexity and Comorbidities
Diagnosis codes can also provide information about complicating conditions and patient complexity.
A complete review should therefore consider the principal diagnosis, secondary diagnoses, and other applicable diagnosis information.
CMS Guidance for Emergency Department Coding
CMS has provided guidance concerning the development of hospital internal guidelines for assigning ED visit levels.
The guidance emphasizes that hospital facility resources should be considered when developing facility-level coding guidelines. CMS also identifies other principles involving consistency, documentation, compliance, availability of guidelines, and the ability to verify coding decisions.
Key principles include:
- Guidelines should reasonably relate hospital resources to different levels of service.
- Guidelines should be based on hospital facility resources.
- Guidelines should support accurate payment and compliance.
- Documentation requirements should be clinically necessary.
- Guidelines should not encourage upcoding or gaming.
- Guidelines should be documented and provide a basis for code selection.
- Guidelines should be applied consistently.
- Guidelines should not change unnecessarily frequently.
- Guidelines should be available for appropriate review.
- Coding decisions should be verifiable by internal and external reviewers.
These principles are particularly relevant when hospitals evaluate payer-level adjustments.
Payer Reimbursement Policy vs. Coding Guidelines
One of the most important distinctions in an ED denial is whether the payer is questioning:
1. The code reported by the provider
or
2. The amount the payer is willing to reimburse for that code under its policy or contract.
These are not necessarily the same issue.
A payer may have contractual reimbursement provisions that affect how a claim is paid. At the same time, a hospital may maintain its own facility coding guidelines for selecting an ED level.
Therefore, an appeal should identify the specific basis for the adjustment rather than treating every reduction as a coding error.
How Hospitals Can Respond to ED Coding Denials
When a payer downcodes an ED claim, hospitals should establish a structured review process.
1. Identify the Exact Denial Reason
Determine whether the payer cited:
- Coding
- Medical necessity
- Documentation
- Diagnosis
- Level of service
- Contractual reimbursement
- Payer-specific policy
2. Compare the Submitted and Adjusted Codes
For example, determine whether the original claim contained 99285 and whether the payer reimbursed the service at 99284 or another level.
3. Review the Facility’s Coding Guidelines
Confirm that the hospital’s internal methodology is:
- Documented
- Consistently applied
- Supported by appropriate guidance
- Based on facility resources
- Available for audit review
4. Review the Complete Medical Record
Do not rely solely on the principal diagnosis.
Review relevant documentation, including:
- Presenting complaint
- Nursing documentation
- Physician documentation
- Diagnostic testing
- Treatments
- Medication administration
- Monitoring
- Procedures
- Consultations
- Disposition
- Transfers
- Other resource utilization
5. Review the Payer Contract
Determine whether the payer’s reimbursement methodology is incorporated into the provider agreement.
This is especially important when the payer applies a proprietary or automated methodology.
6. Compare Similar Claims
Hospitals can analyze denial patterns by:
- Payer
- Diagnosis
- CPT code
- Facility
- Provider
- Date
- ED location
- Denial reason
This can help identify whether the issue represents an isolated claim problem or a broader payer trend.
7. Prepare a Focused Appeal
An effective appeal should address the specific reason for the adjustment and provide documentation supporting the reported level of service.
Avoid simply restating the original claim.
Common Challenges With Automated ED Claim Reviews
Automated systems can process large numbers of claims, but hospitals may still need to understand how the resulting reimbursement decision was reached.
Important questions include:
- What data were used?
- How were the data weighted?
- Which diagnoses affect the calculation?
- How are diagnostic services categorized?
- How frequently is the methodology updated?
- Are facility-specific characteristics considered?
- Which claims are subject to the methodology?
- What exclusions apply?
- Can the payer provide sufficient information to support the adjustment?
These questions can help hospitals determine whether an appeal should focus on coding, documentation, payment policy, contract terms, or a combination of these issues.
Building an ED Denial Management Strategy
Rather than handling every denial individually, hospitals can use denial data to identify recurring patterns.
A structured ED denial-management program can track:
| Metric | What to Monitor |
|---|---|
| Denial volume | Number of ED level-of-care denials |
| Denial rate | Percentage of ED claims affected |
| CPT | 99284 vs. 99285 patterns |
| Payer | Denials by insurance company |
| Diagnosis | Diagnosis categories associated with denials |
| Adjustment | Difference between billed and reimbursed level |
| Appeal rate | Percentage of denials appealed |
| Appeal success | Reversals and recovered reimbursement |
| Root cause | Coding, documentation, policy, contract, etc. |
This approach can help revenue cycle teams identify whether additional coding education, documentation review, payer escalation, or contract analysis is appropriate.
Final Thoughts
Emergency department coding denials can involve more than a simple disagreement over a CPT code. Hospitals should distinguish between facility coding guidelines, payer reimbursement policies, contractual provisions, and medical necessity determinations when reviewing an adjustment.
Historical payer policies involving ED level-of-care reimbursement demonstrate why hospitals should monitor payer communications and evaluate changes against their contracts and applicable coding guidance.
When an ED claim is downcoded, a structured review of the denial reason, medical record, facility resources, coding methodology, payer policy, and contractual terms can provide a stronger basis for determining the appropriate response.