The doctor had come to the city for attending an annual conference yesterday was caught in compromising position, police said today.
Police late last night raided an apartment in Vaishali Nagar to bust the alleged racket and arrested the accused.
All accused have been booked under sections of Prevention of Immoral Trafficking Act (PITA).
The accused doctor is a resident of Amreli district in Gujarat and had come to attend a medical conference and later in the evening came in contact of the racket.
The four girls are from Jammu and Kashmir, Mumbai, Uttar Pradesh and Jaipur.