Kolkata: The West Bengal Clinical Establishment Regulatory Commission has decided to examine allegations of fraudulent billing practices at four private hospitals after a private insurance company flagged sample cases involving alleged unnecessary admissions, prolonged hospital stays and manipulation of medical records. Retired judge Ashim Banerjee, chairperson of the commission, said the insurer's complaint named one hospital in Calcutta, one in Durgapur and two in Siliguri. "We have received a written complaint from a private insurance company against four private hospitals. Though the hospitals replied only on those bills, we are treating this as a broader issue," Banerjee said, reports The Daily. The hospital, for its part, maintained that the rejected portion of the claim had been wrongly disallowed by the insurer.