Nephrologist Ganesan attached to the Vinayaka Mission Hospital here was nabbed a police team led by Deputy Superintendent of Police Parameswara.
Police have so far arrested five brokers since the racket came to light on June 11.
They said 80 patients whom the doctor had so far treated were being questioned to ascertain if any of them had sold their kidneys.
Meanwhile,an ambulance driver at the hospital surrendered before a local court today.