An attorney has filed the latest in a series of civil lawsuits against twin physician brothers, accusing them of impersonating one another and sexually assaulting female patients in an obstetric-gynecology practice.

In a complaint filed in King County Superior Court by Seattle lawyer Harish Bharti, six female patients of Charles Momah said they were sometimes deceived into being seen, examined, operated on and sexually fondled by his twin, Dennis Momah, a general practitioner who is not certified in obstetrics and gynecology.

Charles Momah, who had gynecological practices in Burien and Federal Way, two suburban cities south of Seattle, pleaded not guilty last fall to criminal charges of rape, indecent liberties and insurance fraud. He has not yet been tried.

Bharti said the women, as well as others that he is representing in other lawsuits, had complained to a variety of authorities over several years about their treatment in Charles Momah’s practice. However, for some time, no one seemed interested in investigating the complaints, Bharti said on Monday.

“I have heard them cry in my offices,” Bharti said, “I tell you, it was an insult to these women. ... No doubt, nobody would listen.”

Neither man could be contacted for comment. Phones at both of Charles Momah’s practices have been disconnected.

The women assert that the two sometimes switched identities and assaulted them.

On some occasions the doctor they believed to be Charles Momah was jovial and talkative with little accent. He bore certain scars and other physical characteristics.

On other visits, the man they believed to be Charles Momah stuttered, had a heavy accent, and even appeared to be a different weight, claim the women who filed suit.