The OIG has issued a report entitled “Medicare Part B Services During Non-Part A Nursing Home Stays: Mental Health.” The OIG reports that 39% of allowed Part B claims for mental health services during non-Part A nursing home stays in 2006 did not meet Medicare rules because they were medically unnecessary, inadequately documented, or miscoded, resulting in an estimated $74 million in inappropriate payments. Claims for psychotherapy services comprised the majority of these inappropriately-paid claims. The OIG also found that 71% of sampled mental health claims contained inaccurate diagnosis codes or lacked adequate documentation to support the code, without directly affecting reimbursement.