All I know is below mentioned, as I only do outpatient.
1. Level I / Triage care (Minor Problems): If only Evaluation and Management services are rendered to the patients with no diagnostic tests
2. Level II / Intermediate care (Moderate): If injections and vaccines, splinting are given along with E & M services
3. Level III / Complex care (severe): IF IV infusion, sutures are performed along with E & M services
I will love any advice you have for me.