Codes 99252-99255 are used to report inpatient or observation consultation services for new or established patients. Only one consultation code can be reported per admission. Subsequent visits during the same admission use subsequent hospital care codes. The codes differ based on the level of medical decision making required and the minimum total time spent on the encounter. Code 99255 requires the highest level of medical decision making and a minimum of 80 minutes of total time. Prolonged consultation services over 95 minutes should be coded using 99418.