The "Rock Doc" stood in Miami federal court Monday sporting an all-black look of T-shirt, pants and sneakers but some not-so-hip accessories – shackles on his wrists and ankles. His grayish-blond hair, once worn in punk-style spikes, was disheveled. Christopher Gregory Wayne, dubbed the "Rock Doc,'' had been arrested at Larkin Community Hospital earlier in the day on a dozen charges of Medicare fraud. The longtime Miami Beach resident, 53, was accused of falsely billing the taxpayer-funded program for physical therapy procedures, such as massages and electrical stimulation, that were not necessary or in some instances had been provided at his prior medical practice in Miami.