From the ACGME Transitional Year requirements:
"At least 24 weeks of each resident's curriculum must be provided by a discipline or disciplines that offer fundamental clinical skills, that is, emergency medicine, family practice, internal medicine, bstetrics/gynecology, pediatrics or surgery."
Later on:
4. Emergency Medicine
a. The transitional year residents must have at least a 4-week rotation (minimum of 140 hours) in emergency medicine under the supervision of qualified teaching staff within the sponsoring or an affiliated institution.
b. The transitional year residents must have the opportunity to participate in the evaluation and management of the care of all types of patients who present to an institution's emergency department.
5. Ambulatory Care
a. The transitional year residents must have at least 140 hours of documented experience in ambulatory care other than that acquired in the emergency department. This experience may consist of a 1-month block or be divided into lesser periods of time to ensure a total of 140 hours.
b. Outpatient experience must be obtained from ambulatory experiences provided by family practice, internal medicine, obstetrics/gynecology, pediatrics, and surgery at the sponsoring or affiliated institution(s)/sites.