A recently published study by Millman, Inc. on behalf of the Society of Actuaries (SOA) lists the ten most expensive errors in healthcare settings:

The top ten: 1 -Pressure ulcers—374,964 errors, $10,288 per error 2 - Postoperative infections—252,695 errors, $14,548 per error 3 - Mechanical complication of a device, implant or graft—60,380 errors, $18,771 per error 4 - Postlaminectomy syndrome—113,823 errors, $9,863 per error 5 - Hemorrhage complicating a procedure—78,216 errors, $12,272 per error 6 - Infection following infusion, injection, transfusion, vaccination—8,855 errors, $78,083 per error 7 - Pneumothorax—25,559 errors, $24,132 per error 8 - Infection due to central venous catheter—7,062 errors, $83,365 per error 9 - Other complications of internal (biological) (synthetic) prosthetic device, implant and graft—26,783 errors, $17,233 per error 10 - Ventral hernia without mention of obstruction or gangrene—53,810 errors, $8,178 per error