Question: I need to make an adjustment to the credentialing information for one of my providers. Does this situation require filling out a new provider enrollment form? North Carolina Subscriber Answer: According to the Medicare Administrative Contractor (MAC) , there are different forms available depending on whether the information change involves an individual physician or a practice at large. Look for the following forms when you need to make changes to Medicare provider paperwork: Palmetto GBA also recommends filing the paperwork electronically through the Medicare Provider Enrollment, Chain, and Ownership System (PECOS) , where applications may be processed up to 50 percent more quickly than paper applications. Rachel Dorrell, MA, MS, CPC-A, CPPM, Development Editor, AAPC