ER Code
Definition
ER codes are CPT codes 99281-99285 used to bill emergency room visits. They represent different levels of severity and complexity. The specific code chosen depends on the patient's presenting condition, the resources used, and the medical decision-making required during the visit.
Why It Matters
ER code selection directly affects reimbursement. Upcoding inflates revenue but triggers audits and compliance risk. Undercoding loses revenue for high-acuity cases. Accurate ER coding requires documentation of severity, symptoms, and clinical assessment. Improper ER codes are common denial drivers.
How It Works
ER codes range from 99281 (minor, self-limited) to 99285 (severe, high-risk). The selection is based on documentation of the presenting problem, history and exam findings, medical decision-making complexity, and resources used. Each code level is defined by specific criteria: 99281 is used for minor symptoms with minimal risk; 99285 is used for life-threatening conditions requiring immediate intervention. These codes are exempt from prior authorization requirements under EMTALA (Emergency Medical Treatment and Labor Act). After coding the ER visit, add any procedures, imaging, or additional services billed separately. Medical necessity is supported by both the ER code level and the CPT codes for associated procedures.
Related Terms
Do ER visits require prior authorization?
No. Emergency services are exempt from prior authorization under EMTALA and most insurance plans. You bill the ER visit without pre-approval. However, subsequent admission to the hospital or certain procedures performed during the ER visit may require authorization. Check the patient's insurance plan for specifics.
What ICD-10 codes go with ER CPT codes?
ER CPT codes are paired with diagnosis codes that describe the chief complaint or reason for the visit (e.g., chest pain, shortness of breath, trauma). Use specific ICD-10 codes rather than vague 'unspecified' codes to support medical necessity. The diagnosis must justify the level of ER service billed.
See How Altair Codes ER Visits Accurately
Altair analyzes clinical documentation and recommends the correct ER level code based on severity and resources, reducing audit risk. See how it works.
This glossary is for informational purposes. Consult official billing guidelines and payer policies for definitive definitions. Last updated: 2026-04-06.