Noridian Medicare Portal
05/17/2026 | 07:59 AM
The Noridian Medicare Portal (NMP) was refreshed over the weekend of May 16–17, 2026. While no functionality or inquiry processes have changed, users may notice minor updates to the site’s appearance and overall user experience. NMP remains committed to providing timely and accurate information to our valued customers.
Enhanced Monitoring Controls Notification:
CMS identified a concerning trend of malicious actors stealing MBIs and using them to commit Medicare fraud. Some are misusing Medicare Administrative Contractor (MAC) MBI lookup tools. We’re implementing enhanced monitoring controls to prevent this abuse.
What You Need to Know
Only use the MAC MBI lookup tool for people you intend to provide a service or product to that you’ll bill to Medicare. Our enhanced monitoring compares the MBIs you look up against actual claims submitted with NPIs. If we notice an unusually high rate of MBI lookups without associated claims, your access to the lookup tool may be removed.
Make sure your MAC portal users are associated with NPIs in your organization on whose behalf they may perform MBI lookups. This helps us verify legitimate use and protects your access to the lookup tool.
Warning:
You are accessing an information system that may be a U.S. Government information system. If this is a U.S. Government information system, CMS maintains ownership and responsibility for its computer systems. Users must adhere to CMS Information Security Policies, Standards, and Procedures. For U.S. Government and other information systems, information accessed through the computer system is confidential and for authorized users only. By continuing beyond this notice, users consent to being monitored, recorded, and audited by company personnel. Unauthorized or illegal use of the computer system is prohibited and subject to criminal and civil penalties. The use of the information system establishes user's consent to any and all monitoring and recording of their activities.
Note: The information obtained from this website application, Noridian Medicare Portal, is as current as possible. There are times in which the various content contributor primary resources are not synchronized or updated on the same time interval.
This warning banner provides privacy and security notices consistent with applicable federal laws, directives, and other federal guidance for accessing this Government system, which includes all devices/storage media attached to this system. This system is provided for Government authorized use only. Unauthorized or improper use of this system is prohibited and may result in disciplinary action and/or civil and criminal penalties. At any time, and for any lawful Government purpose, the government may monitor, record, and audit your system usage and/or intercept, search and seize any communication or data transiting or stored on this system. Therefore, you have no reasonable expectation of privacy. Any communication or data transiting or stored on this system may be disclosed or used for any lawful Government purpose.