Prosecutors say there were 10 cases in which physicians faked diseases to generate payment from patients.
More details on the case emerged Friday. The pair, a man and a woman, were detained Thursday.
The Poder Judicial said that the man, identified by the last name of Baltodano was a radiologist. He is accused of doctoring the radiological photographs to show that the patients had serious illnesses.
The physician urged the patients to visit a private clinic run by the second doctor, identified by the last name of Monestel, prosecutors allege.
Ms. Monestel is accused of treating the patients with natural medicines and accepting payments for each visit.
Prosecutors said that three more complains about the pair arrived Friday as a result of publication of the case. They said they would ask a judge to keep the pair from practicing medicine until the case is decided.