Emergency medicine in Illinois can be unexpectedly complicated. Even when patients visit an in-network hospital, they often receive separate bills from out-of-network emergency providers, creating confusion around emergency medicine billing practices. According to a 2024 study by the Kaiser Family Foundation, nearly 1 in 5 emergency visits in Illinois still result in out-of-network charges, despite federal protections like the No Surprises Act.
What makes it more challenging? Frequent claim denials, constantly changing compliance requirements, and the complex overlap of state and federal regulations like House Bill 4703.
What Is Medical Billing And Coding In Emergency Medicine?
In emergency medicine, billing and coding are the processes of translating ER services into specific codes and submitting them to insurance companies for payment. Medical coding involves assigning ICD-10 codes for diagnosis and CPT codes for procedures. Medical billing then submits these codes to insurers to request payment for services rendered.
Hospital vs. Physician Billing: Facility Fee vs. Professional Fee
When you visit the Emergency Department, your bill might come from both the hospital and the physicians involved in your care. This is because of the split between facility billing and professional fees. The facility fee covers the hospital’s overhead, equipment, and staff, while the professional fee is for the services provided by the emergency physician. The complexity arises when both charges are billed separately, which often leads to confusion and unexpected costs, especially when one of the charges comes from an out-of-network provider.
Top CPT Codes for Illinois ER Billing
CPT Code | Description |
99281 | Emergency department visit, minimal complexity |
99282 | Emergency department visit, low complexity |
99283 | Emergency department visit, moderate complexity |
99284 | Emergency department visit, high complexity |
99285 | Emergency department visit, very high complexity |
93000 | Electrocardiogram (ECG) |
80053 | Basic metabolic panel (BMP) |
Top ICD-10 Codes for Illinois ER Billing
ICD-10 Code | Description |
R07.9 | Chest pain, unspecified |
J06.9 | Acute upper respiratory infection, unspecified |
M54.5 | Low back pain |
S01.81XA | Laceration of scalp, initial encounter |
T14.91XA | Unspecified injury, initial encounter |
I21.9 | Acute myocardial infarction, unspecified |
E11.9 | Type 2 diabetes mellitus, unspecified |
Common Denial Reasons in Emergency Medicine Billing in Illinois

Lack of medical necessity and incorrect modifiers are the main reasons for denials, but several other issues can lead to claim rejection and denials. Let’s take a closer look:
1. Lack of Medical Necessity
One of the top reasons for denials is when a treatment or procedure is deemed not medically necessary. Insurers may reject claims if they determine the care provided wasn’t required for the patient’s condition, which can lead to unexpected costs for both patients and providers.
2. Incorrect Modifiers
Using the wrong modifiers, such as failing to specify whether a procedure was inpatient or outpatient, is another common mistake. Inaccurate modifiers can cause delays or denials in claims, so getting them right is crucial.
3. Incomplete or Missing Documentation
Another reason for claim denials is missing or incomplete documentation. If the medical records don’t fully support the services billed or if crucial details are left out, insurers may reject the claim. It’s important to ensure that all necessary documentation is in order to avoid this issue.
4. Coding Errors
Errors in CPT or ICD-10 coding are a significant reason for claim denials. Incorrect codes or outdated coding guidelines can lead to the rejection of claims. Keeping up-to-date with the latest coding standards is essential to avoid this pitfall.
5. Out-of-Network Providers
When emergency care involves out-of-network providers, the claim may be denied or underpaid, especially if the patient was not aware of the provider’s network status. This is a common challenge in emergency medicine billing in Illinois, where insurance networks and out-of-network charges are complex.
6. Timely Filing Issues
Most insurers typically have a strict time limit for submitting claims. If a claim is submitted after the deadline, it might get denied, regardless of the care provided.
How to Appeal Denied ER Claims in Illinois
If your ER claim gets denied in Illinois, there’s no need to panic. You can appeal the decision by following a structured process. Here’s how to do it:
Review the Denial Reason
Firstly, carefully review the reason your claims got denied. The insurer will provide you with a detailed explanation of it, such as a lack of medical necessity or incorrect coding. Understanding the core reason for denials is crucial.
Gather Supporting Documentation
Once you know the reason for the denial, collect all necessary supporting documents. This includes medical records, physician notes, and any other documentation that proves the service was necessary and should be covered.
Submit Your Appeal
Submit the appeal to the insurer with the correct and complete information. Be clear and detailed about why the claim should be covered. If you’re appealing under Medicare, BCBS IL, or other insurers, make sure you’re aware of their specific appeal processes and timelines.
Follow Up Regularly
After submitting your appeal, don’t forget to follow up regularly. Delays in response can affect your payment, so staying on top of the process is essential. Be persistent to ensure your claim is reconsidered.
Audit Protection Tips for Emergency Medicine Billing in Illinois

No Surprises Act & Balance Billing in Illinois
The NO Surprise Act was proposed to protect patients from unexpected medical bills, particularly in emergencies. It eliminates balance billing, which occurs when a patient is billed for the difference between what their insurance covers and the amount the provider charges, especially if the provider is out of network.
In Illinois, this law applies to emergency care, meaning that even if you receive treatment from an out-of-network provider, you won’t be charged more than your in-network copayments, deductibles, or coinsurance. This helps ensure that patients aren’t left with surprise bills after seeking emergency treatment, regardless of the provider’s network status.
New Illinois Medicaid Policies and Key Updates for Emergency Medicine Providers
Illinois has recently implemented a few changes to its medicaid program to enhance healthcare access. These updates include expanded eligibility for low-income residents and adjustments to reimbursement rates. As of June 2024, approximately 3.3 million Illinois residents are enrolled in Medicaid and the Children’s Health Insurance Program (CHIP), with 843,458 individuals covered under the Affordable Care Act (ACA) Medicaid expansion.
Key policy updates include:
- Increased Reimbursement Rates: Effective January 1, 2024, Illinois raised hospital reimbursement rates by 20% for inpatient and outpatient emergency care services. Ground ambulance service providers and air ambulance services also saw rate increases.
- Enhanced Emergency Medical Transportation Payments: Supplemental payments for ground emergency medical transportation (GEMT) were introduced for publicly owned transportation providers, aiming to improve reimbursement for these services.
Why Outsourcing Emergency Medicine Billing in Illinois Is the Best Option?
Outsourcing emergency medicine billing in Illinois offers several benefits for healthcare providers:
- Expertise & Compliance: Specialized billing companies stay up-to-date with complex Illinois ER coding guidelines and regulations like the No Surprises Act, ensuring compliance and reducing the risk of denials.
- Focus on Patient Care: By outsourcing, providers can focus on patient care instead of billing issues, improving overall service quality.
- Reduced Denials: Billing experts ensure accurate coding and timely submission of claims, reducing the chance of denials and improving cash flow.
- Cost Efficiency: Outsourcing is more cost-effective than maintaining an in-house team, reducing overhead expenses.
- Faster Claims Processing: Professional billing companies speed up claims processing, helping ensure timely reimbursements.
- Audit Protection: Outsourcing providers help prevent audit risks with thorough documentation and proactive compliance checks.
Final Thoughts
Emergency medicine billing in Illinois is complex, with evolving regulations and challenges like facility vs. professional fees, coding errors, and denials. Providers must stay updated on state and federal policies, such as the No Surprises Act and Illinois Medicaid changes, to ensure accurate billing and timely reimbursements. By staying proactive and compliant, healthcare providers can deal with these challenges and reduce financial risks in emergency care.
Why CloudRCM is the Best Choice for Emergency Medicine Billing
CloudRCM is the perfect partner for your emergency medicine billing needs. We specialize in Illinois ER coding, ensuring compliance with the latest state and federal regulations like the No Surprises Act. Our team reduces denials, maximizes reimbursements, and improves your billing process, letting you focus on patient care while we handle the financial complexities. Choose CloudRCM for accurate, efficient, and reliable billing services.
Feel free to reach us today! 22(4) 231-6880
FAQs
What is emergency medicine billing?
It’s the process of submitting ER services to insurance for reimbursement.
What’s the difference between facility and professional fees?
The hospital bills facility fees; professional fees come from the ER physician.
Why do ER claims get denied in Illinois?
Common reasons include incorrect coding, lack of medical necessity, and missing documentation.
How does the No Surprises Act affect ER billing in Illinois?
It protects patients from unexpected out-of-network charges during emergencies.
Which CPT codes are used for ER visits in Illinois?
Codes like 99281–99285 are used based on the complexity of the visit.
Do Illinois Medicaid policies impact emergency billing?
Yes, recent changes include higher reimbursement rates and expanded eligibility.
How do I appeal a denied ER claim?
Review the denial, gather documents, and submit a written appeal to the insurer.