Address changes must be made within 90 days by completing a Change of Information electronically through the PECOS system (recommended) or by submitting the changes on a CMS-855A: Medicare Enrollment Application – Institutional Providers. The provider address that is used for Medical Review correspondence is found in Section 2: Identifying Information, C: Correspondence Address. An excellent resource for providers can be found at: PECOS Enrollment Tutorial - Change of Information for an Individual Provider. Please also verify that you have submitted any required documentation to your state as well. In addition, assistance is available by calling the Provider Enrollment area at the following numbers: 855-834-5596 (Jurisdiction 6) and 855-593-8047 (Jurisdiction K). Additional processing guidance can be found in the CMS-IOM Publication 100-08, Program Integrity Manual, Chapter 10 – Medicare Enrollment.