Section 6401 (a) of the Affordable Care Act established a requirement for all enrolled providers and suppliers to revalidate their enrollment information under new enrollment screening criteria. This revalidation effort applies to those providers and suppliers that were enrolled prior to March 25, 2011. MACs will send out notices on a regular basis to begin the revalidation process for each provider and supplier. Providers and suppliers must wait to submit the revalidation only after being asked by their MAC to do so.

CMS has established Internet-based Provider Enrollment, Chain and Ownership System (PECOS) as an alternative to the paper (CMS-855) enrollment process. The Centers for Medicare and Medicaid Services (CMS) urges providers to utilize this system when submitting an initial Medicare enrollment application, changing your enrollment information and revalidating your Medicare information.

Note: Providers and suppliers must have Internet Explorer version 5.5 or higher and have the most recent version of Adobe Acrobat Reader before initiating an enrollment action using Internet-based PECOS.

Letters Being Mailed in Phases

CMS has posted a listing of all providers and suppliers who have been mailed a revalidation notice. The files are broken down by the month in which the revalidation request was mailed. CMS will add lists on a bimonthly basis. To see the listing, click on Revalidation Listing in the Downloads section on the CMS Medicare Provider/Supplier Enrollment website.  In addition, Cahaba also has a Revalidation List  listing the most recent mailing within our jurisdiction.

If you are listed on either of these reports, and have not received the request, please contact Cahaba.


Cahaba GBA
Part A Provider Enrollment
Post Office Box 6168
Indianapolis, IN 46206
1-877-567-7271, **
TDD 1-877-467-7516
** Using the Interactive Voice Response system, select option 6 for questions related to revalidation.

Do you have additional questions?

Any questions concerning provider enrollment policy or your provider’s situation should be referred to our Provider Contact Center at the dedicated toll-free number. Questions concerning a system issue regarding PECOS should be referred to the CMS EUS Help Desk at 1-866-484-8049, or send an email to


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Page last updated:  January 24, 2014

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