Are denied emergency department (ED) claims causing delays in reimbursement? CPT Code 99284 is used for Level 4 ED Evaluation and Management (E/M) services that require moderate medical decision making (MDM). CMS will still require ED E/M code assessment based on MDM rather than the nature of the history and physical examination in 2026.
Correct use of CPT Code 99284 ensures accurate billing and reimbursement. Incomplete documentation, unsupported medical necessity, or selecting the incorrect ED visit level can all result in claim denials, payment delays, and audit risk.
This guide explains CPT Code 99284, including its description, documentation requirements, billing guidelines, reimbursement factors, pricing considerations, and code comparisons. It also covers common coding mistakes, denial prevention strategies, and compliance tips to help healthcare providers, medical coders, and revenue cycle teams improve claim accuracy.
What Is CPT Code 99284?
CPT Code 99284 is an Emergency Department (ED) Evaluation and Management (E/M) code reported for a Level 4 ED visit involving moderate medical decision making (MDM). It applies to both new and established patients receiving emergency care. Under the current ED E/M guidelines, providers select this code based on the complexity of MDM rather than the extent of the history or physical examination.
Patients reported with CPT Code 99284 commonly present with acute illnesses or injuries that require diagnostic testing, prescription drug management, or close clinical evaluation. The documentation must clearly support the medical necessity of the services performed and the moderate level of decision making.
What Does ER Level 4 CPT Code Mean?
An ER Level 4 CPT Code represents emergency visits that require a moderate level of clinical evaluation and decision making. These encounters usually involve conditions with a moderate risk of complications or morbidity if left untreated.
Examples may include:
- Moderate asthma exacerbation
- Acute abdominal pain requiring imaging
- Chest pain requiring diagnostic evaluation
- Cellulitis requiring intravenous antibiotics
- Dehydration requiring intravenous fluids
When Should CPT Code 99284 Be Reported?
CPT Code 99284 should be reported when the ED encounter meets the requirements for moderate medical decision making (MDM) under the current Emergency Department E/M guidelines. Code selection is based on the complexity of the patient’s condition, the amount of data reviewed, and the risk associated with diagnosis or treatment.
Moderate MDM often includes one or more of the following:
1. An acute illness with systemic symptoms
2. An acute complicated injury
3. Review and interpretation of diagnostic tests
4. Prescription drug management
5. Decisions regarding further evaluation or follow-up car
CPT Code 99284 Level 4 Requirements
CPT Code 99284 is reported for a Level 4 Emergency Department (ED) Evaluation and Management (E/M) visit when the encounter supports moderate medical decision making (MDM). Under the current ED E/M guidelines, providers select the code based on the complexity of MDM, while the history and physical examination are performed as medically appropriate for the patient’s condition.
A Level 4 ED visit generally requires documentation that supports moderate complexity in the patient’s evaluation and management. The medical record should demonstrate:
- One or more acute illnesses or injuries requiring moderate MDM.
- Appropriate diagnostic testing, review of results, or analysis of clinical data when clinically indicated.
- Moderate risk associated with the patient’s diagnosis, treatment, or management decisions, such as prescription drug management or further diagnostic evaluation.
- Clear documentation of the provider’s clinical assessment, treatment plan, and medical necessity for the services provided.
Documentation Requirements for CPT Code 99284
Accurate documentation is essential when reporting CPT Code 99284. The medical record should support moderate medical decision making (MDM) and clearly explain why the Level 4 Emergency Department (ED) service was medically necessary.
Required Documentation Elements
The medical record should clearly include:
1. Chief complaint and presenting symptoms.
2. Relevant history of present illness (HPI).
3. Medically appropriate physical examination.
4. Assessment of the patient’s condition.
5. Differential diagnosis, when appropriate.
6. Diagnostic tests ordered, reviewed, or interpreted.
7. Moderate MDM supporting the reported service level.
8. Treatment provided, including medications or procedures.
9. Disposition, discharge instructions, and follow-up plan.
Documentation Mistakes That Lead to Denials
The following issues commonly result in claim denials or payer audits:
- Missing or unsupported moderate MDM.
- Incomplete documentation of medical necessity.
- Insufficient explanation of diagnostic testing or treatment decisions.
- Diagnosis codes that do not support the reported service level.
- Selecting CPT Code 99284 without documentation supporting a Level 4 ED encounter.
CPT Code 99284 Price
Payment amounts vary by payer, geographic location, facility status, and Medicare payment policies, so there is no single reimbursement rate for every practice.
The table below summarizes the key Medicare reimbursement details for CPT Code 99284. Actual payment varies based on the Medicare Administrative Contractor (MAC), Geographic Practice Cost Indices (GPCIs), place of service, and other payment adjustments.
| Reimbursement Factor | Details |
| CPT Code | 99284 |
| Service Description | Emergency Department (ED) Evaluation and Management (E/M), Level 4 |
| Patient Type | New or established patient |
| Medical Decision Making (MDM) | Moderate MDM |
| Payment Method | Medicare Physician Fee Schedule (PFS) |
| 2026 Medicare Conversion Factor | $33.4009 (standard) |
| 2026 Advanced APM Conversion Factor | $33.5675 (Qualifying APM Participants) |
| Payment Calculation | Relative Value Units (RVUs) × Geographic Practice Cost Index (GPCI) × Medicare Conversion Factor |
| Reimbursement Varies By | Geographic locality, place of service, Medicare payment adjustments, and applicable payer rules |
CPT Code 99284 vs Other Emergency Department CPT Codes
Choosing the correct Emergency Department (ED) E/M code is essential for accurate billing and compliance. This comparison explains how CPT Code 99284 differs from other ED visit codes based on the level of medical decision making (MDM) required under the current ED E/M guidelines.
| CPT Code | ED Visit Level | Medical Decision Making (MDM) | Patient Presentation |
| 99281 | Level 1 | May not require physician/QHP involvement | Minor or self-limited concern requiring minimal evaluation |
| 9982 | Level 2 | Straightforward MDM | Minor illness or injury with straightforward assessment and treatment |
| 9983 | Level 3 | Low MDM | Stable acute illness or uncomplicated injury requiring limited diagnostic evaluation |
| 9984 | Level 4 | Moderate MDM | Acute illness or injury requiring diagnostic testing, prescription drug management, or moderate-risk treatment decisions |
| 9985 | Level 5 | High MDM | Severe illness or injury posing a high risk of morbidity or requiring urgent, high-complexity decision making |
CPT Code 99283 vs CPT Code 99284
The primary difference between 99283 and 99284 is the level of medical decision making. 99283 is appropriate for encounters involving low MDM, while 99284 requires moderate MDM supported by the patient’s condition, diagnostic evaluation, and management decisions.
Providers should report 99284 only when the documentation clearly demonstrates moderate complexity.
CPT Code 99284 vs CPT Code 99285
Both codes apply to higher-acuity ED visits, but 99285 is reserved for encounters involving high MDM and conditions with a significantly greater risk of complications or morbidity.
99284 should not be reported when the documentation supports high-complexity decision making, and 99285 should not be selected unless the medical record justifies that higher level of service.
Does CPT Code 99284 Need a Modifier?
Modifiers are not required for every CPT Code 99284 claim. However, they should be reported when the clinical documentation and payer guidelines support their use. Applying the correct modifier helps distinguish separate services, supports accurate reimbursement, and reduces the risk of claim denials.
Modifier 25
Report Modifier 25 when a significant, separately identifiable Evaluation and Management (E/M) service is performed on the same day as another procedure or service by the same provider. The documentation must clearly show that the E/M service was above and beyond the work typically included in the procedure.
Modifier 57
Modifier 57 may apply when the Emergency Department visit results in the initial decision to perform a major surgical procedure with a 90-day global period. This modifier indicates that the E/M service led to the surgical decision. It should only be used when payer rules and the clinical record support its application.
Other Modifier Considerations
Depending on the patient’s circumstances and payer requirements, other modifiers may also apply, such as:
Modifier 24: Unrelated E/M service during a postoperative period.
Modifier 27: Multiple outpatient hospital E/M encounters on the same date (facility reporting only, when permitted by the payer).
Modifier 95: Telehealth services, if applicable and allowed under current payer policies.
Conclusion
Understanding CPT Code 99284 is essential for accurate Emergency Department (ED) billing, compliant documentation, and appropriate reimbursement. Reporting this Level 4 E/M code requires documentation that supports moderate medical decision making (MDM) and clearly demonstrates the medical necessity of the services provided.
By applying current ED E/M coding guidelines, maintaining complete clinical documentation, and following payer-specific billing requirements, healthcare providers, medical coders, and revenue cycle teams can reduce claim denials. It helps to improve coding accuracy, and support timely reimbursement while remaining compliant with regulatory standards.
FAQs
What is CPT Code 99284?
CPT Code 99284 is an Emergency Department (ED) Evaluation and Management (E/M) code used for a Level 4 ED visit that requires moderate medical decision making (MDM). It applies to both new and established patients when the documentation supports the reported service level.
What documentation is required for CPT Code 99284?
Documentation should include the chief complaint, relevant history of present illness, a medically appropriate physical examination, diagnostic tests, assessment, treatment plan, and evidence of moderate MDM.
What is the difference between CPT Code 99284 and CPT Code 99285?
CPT Code 99284 is reported for ED visits involving moderate MDM, while CPT Code 99285 is reserved for encounters requiring high MDM and involving a greater risk of complications or morbidity.
Does CPT Code 99284 require a modifier?
A modifier is not required for every CPT Code 99284 claim. However, modifiers such as Modifier 25 or Modifier 57 may be appropriate when the documentation and payer billing guidelines support their use.
How is Medicare reimbursement determined for CPT Code 99284?
Medicare reimbursement for CPT Code 99284 is calculated using the Medicare Physician Fee Schedule (PFS), Relative Value Units (RVUs), Geographic Practice Cost Indices (GPCIs), and the applicable Medicare conversion factor.
