Dr Amit Kumar, the alleged kingpin of the multi-crore rupees kidney racket, was on Saturday deported to India.
Forty-year-old Kumar, who was arrested from a jungle resort in Chitwan in southern Nepal on Thursday, was handed over to a two-member CBI team on Saturday evening.
He is being to flown to New Delhi by IC-814 and is expected to reach later this evening.
CBI had registered a case against Kumar and others on Friday night on a request from the Haryana government under various sections of Indian Penal Code and Human Organ Transplant Act of 1994.
Nepalese authorities, which had on Friday announced that Kumar would be produced in court in Kathmandu on Sunday, acceded to India's request for immediate deportation.
Kumar was arrested from Hotel Wildlife Camp in Chitwan near the Indo-Nepal border and foreign currency of Euro 145,000, $18,900 and an Indian bank draft of Rs 936,000 were seized from his possession.
The Indian doctor, who was believed to have carried out 500 illegal kidney transplants, claimed he was not a kidney dealer and had not committed any crime.
Nepalese police said after questioning Kumar that he had "confessed" to carrying out over 300 kidney transplants in India.
Nepalese police said that Kumar "admitted" to charging Rs three-four lakh for each transplant. He "confessed" to looking for hospitals in Nepal through an agent Pankaj Jha, who is now absconding.
An Interpol Red Corner Notice was issued against the tainted doctor after the massive racket with inter-state and international ramifications came to light on January 24.
Nepalese media reports quoted a police official as saying that Kumar had tried to bribe the police team that went to arrest him.
Police Inspector Prakash Malla, who went to arrest Kumar, told a private television in Kathmandu that the Indian doctor offered up to one crore to set him free.
"Why do you arrest me, take money, how much do you need? Twenty lakh, thirty lakh, forty lakh or one crore?" Malla quoted Kumar as saying.
Police said they also recovered some fake documents from him, which indicated that he was trying to acquire Nepalese citizenship and another passport apparently to help him fly to Canada to join his family there.