Accompanied by wife and Congress MP from neighbouring Supual Ranjeeta Ranjan, Yadav held "Jan Adalat" at Patel ground in Saharsa to know opinion of people whether to take on doctors "overcharging" commonman.
At the outset, the RJD MP from Madhepura told the gathering about his argument with doctors and discussion with state chapter of Indian Medical Association (IMA) on the subject.
The RJD MP has criticised private doctors and nursing homes charging "exorbitant" fees and other charges.
The MP has recently taken a vow that he and his Congress MP wife Ranjeeta Ranjan would go only to government hospitals.
IMA and Bihar Health Services Association (BHSA) have protested Yadav's action.
Congress President Ashok Chaudhary who was in Saharsa in connection with party's membership campaign told reporters that Yadav has raised a genuine issue but his way was not justified.