The University of Maryland's Baltimore Washington Medical Center is sending letters to about 250 spinal fusion patients who received hardware from a defunct California company accused of selling fake parts. The Glen Burnie hospital is continuing to investigate whether any counterfeit parts were used in patients and sent the letters to "address any concerns." Officials said they've found no evidence yet its patients were affected. A number of hospitals across the country, including Baltimore Washington Medical Center, have been sued by health insurers alleging the hospitals used the fake parts and overbilled for them. The suit also named one of the hospital's spinal surgeons, Dr. Randy Davis. Local law firms are also investigating and reaching out to patients.