CPT code 99284: Emergency department visit, high severity

Yes, as long as each encounter meets the documentation and MDM criteria independently.

No, there is no need for a comprehensive history and examination; only a medically appropriate history and/or physical exam is required, but it must support moderate-to-high complexity MDM.

No, this code is specific to services rendered in a hospital-based emergency department.

While 99283's documentation requirements include an expanded problem-focused history and medical decision making, 99284's require a detailed history, detailed examination, and moderate complexity medical decision making.