Starting in January, doctors who e-prescribe can get bonus pay from Medicare, but persuading U.S. doctors to ditch their prescription pads for electronic prescribing so far has been an uphill battle. Only about 10% of doctors are taking the plunge. But the movement is gaining steam as Medicare warns that its bonus payments are for a short time only: Holdouts still sticking to paper in 2012 will find their Medicare payments cut.