Exceptions

The official transition period for the new Medicare Number has ended. The MBI should be used for all of your transactions and inquires.

CMS will continue to accept the HICN on the following data exchanges after 1/1/2020. These are the only exceptions where you may continue to use the SSN-based HICN on or after 1/1/2020.

Appeal	All Appeal Types
Claims	Adjustments Claim status inquiries Claims held in suspense Span date claims inpatient hospital home health Religious nonmedical health care institutions
Information Requests	General Inquiry (beneficiary, provider, plans, etc.) Quality reporting Disproportionate share hospital Medicare Secondary Payer Congressional inquiry Responses to forms or notices Outgoing request for medical documents
Models	Oncology Care Model and Million Hearts Data registry UI and Participating Organization Reports Medicare Shared Savings Program
Reports	Quality reporting Historical reports Medicare Summary Notices Accountable Care Organizations reports Provider Statistical & Reimbursement

Updated 11/23/2021