David Newman, of Montclair, New Jersey, was also sentenced on Monday to three years of post-release supervision. He will have to register as a sex offender.
The investigation into the physician at Mount Sinai Hospital began last January after a woman who was treated for shoulder pain told police Newman gave her morphine and then masturbated on her.
The 46-year-old doctor was arrested after a second woman complained to police. The other women then came forward alleging similar acts.
Newman wrote a book on the patient-doctor relationship. He also claims to have served in a combat hospital in Iraq.