These are used when the physician see's patients on an inpatient basis(follow up visits). To bill a 99231 you need 2 of the 3 components: Problem Focused History, Problem Focused Exam or Straight Forward or Low MDM, or based on time 15 minutes, 99232 you need again 2 of the 3 components: Expanded Problem Focused History, Expanded Problem Focused Exam, Moderate MDM, or based on time 25 minutes, and lastly 99233 requires a Detailed History, Detailed Exam, High MDM or based on time 35 minutes. If billing on time must have the correct time statement documented. Hope this helps.
Kelsey, CPC, CEMC