Below is an excerpt from CMS Claims manual Cpt 12. It doesn't fully explain what you are looking for but gives a little insight into what CMS considers a "Procedure Room". I see a lot of coders mistake a minor treatment room for a Procedure room. Most treatment rooms don't require separate staffing and usually don't have the essential equipment to qualify for a procedure room. I believe the equipment would be "life saving" type equipment in case a complication happens. I'm pretty sure it will need to be certified as stated above. Definitely check your state requirements (Had this open when above replied).
**Treatment for postoperative complications which requires a return trip to the operating room (OR). An OR for this purpose is defined as a place of service specifically equipped and staffed for the sole purpose of performing procedures. The term includes a cardiac catheterization suite, a laser suite, and an endoscopy suite. It does not include a patient’s room, a minor treatment room, a recovery room, or an intensive care unit (unless the patient’s condition was so critical there would be insufficient time for transportation to an OR);