NEW HAVEN (AP) -- The nation's largest obstetrician and gynecologist management company has been subpoenaed as part of an investigation into whether it received insurance kickbacks that artificially inflated malpractice insurance rates for Connecticut doctors, state and company officials said.

Women's Health Connecticut of Avon provides management services to more than 140 doctors and other health care providers around the state. It has been one of the most vocal supporters of a cap on awards in medical malpractice cases.

The company received a subpoena for insurance documents Friday and planned to comply, said Nancy Bernstein, the company's president.

Connecticut Attorney General Richard Blumenthal confirmed the subpoena was part of an investigation into whether the company profited from an illegal insurance brokerage deal that drove up premiums for unwitting doctors.

"The price of their insurance was raised as a result of this scheme," Blumenthal said. "We're talking about literally hundreds of doctors who see thousands of patients for ob-gyn services."

Companies hire brokers to help them find the best insurance providers, who then pay the brokers a commission. It is illegal for brokers to pay clients or share commissions to secure their business - a practice called rebating.

The Women's Health Connecticut investigation adds a new wrinkle to the typical rebating probe. The company's former insurance broker, Hilb Rogal & Hobbs, acknowledged last month that its officials may have accepted extra fees, which are illegal, from insurance providers in exchange for steering business.

Blumenthal is investigating whether those illegal fees were shared with Women's Health Connecticut managers without the knowledge of the doctors, who paid more for insurance because the hidden fees were wrapped into their premiums.

"We don't believe that to be the case," said Women's Health Connecticut's in-house attorney, Katherine Keane. "If the investigation is raising those issues, we would certainly deny it."

Blumenthal said the Women's Health subpoena is one of several filed in a wider investigation of the industry.

"We know of at least two other ob-gyn groups that engaged in similar practices, so the magnitude and ramifications are striking," Blumenthal said. "The Women's Health kickback-sharing scheme is not an isolated or single instance of potential abuse in this industry. It seems to be part of a pattern."

Women's Health Connecticut was formed in 1997 to provide billing and other managerial support for doctors who had been hiring their managerial staffs individually. The company says it is already the nation's largest partnership between ob-gyn doctors and managers and plans to spread the model nationwide.

Dr. Richard S. Ruben, a Danbury obstetrician who organized the doctors that partnered with Women's Health, said company officials didn't profit off the selection of an insurance company and never tried to cut corners.

"We always said, 'No. Let's do it right," said Ruben, who is also chairman of the company's board of directors.

The Women's Health Connecticut investigation accelerated late last month when HRH announced the resignation of its president, fired another employee and turned over documents to federal and state prosecutors and insurance regulators.

"Given that we are continuing to assist in their investigations, it would be inappropriate to comment further," HRH attorney Ross Garber said. The company has pledged to repay any clients who were overcharged.

State regulators are conducting their own rebating investigation into HRH and Women's Health, said Connecticut Insurance Commissioner Susan Cogswell.

The Doctor's Company, the California-based company that sold insurance to Women's Health, is conducting an audit of the account but has not been subpoenaed, spokeswoman Jesmine Hulsey said. Women's Health is no longer affiliated with HRH or the Doctor's Company and is now self-insured.

(Copyright 2005 by The Associated Press. All Rights Reserved)