Verify the place of service code on ‘Medicare Service POS’ text box. It defaults to 11. For a list of codes, refer to the following PDF document at the Center for Medicare & Medicaid Services website: www.cms.gov/PlaceofServiceCodes/Downloads/posdatabase110509.pdf. If you are going to electronically submit insurance claims through a clearinghouse, use the remaining fields on this section to specify the clearinghouse information and account information needed to process insurance claims with it. For Gateway EDI, use the values specified on Fig. 7 and enter the ‘Interchange Sender ID’ and ‘Application Sender Code’ that Gateway EDI assigns to your office.