DialClerk Directory

CMS Enrollment and Identity Systems (PECOS, I&A, NPPES)

Credentialing and enrollment

Track practice enrollment, network contracts and provider-directory changes through the correct administrative team.

provider enrollment credentialing

External User Services (EUS) Help Desk - PECOS / I&A

Official page read
Phone866-484-8049

PECOS and I&A technical account-access and navigation support

TTY phone866-523-4759

EUS TTY, as published in CMS Medicare Provider Enrollment (MLN9658742, December 2025)

Published email

EUS_Support@cms.hhs.gov

EUS technical support for PECOS and I&A

Published hours

Monday–Friday 7 a.m.–7 p.m. Eastern

Product, plan and location

other
National contact — confirm product and location

Mailing address
CMS External User Services Mail Stop DO-01-50 7500 Security Blvd Baltimore, MD 21244-1850

Regular correspondence to CMS External User Services; not the NPI paper-application address or a Medicare claims destination.

Technical account-access and navigation help for PECOS and I&A. Enrollment decisions/status and payment or claim determinations belong with the appropriate Medicare Administrative Contractor. EUS regular-mail address is distinct from the NPI Enumerator paper-application mail stop. No dedicated fax is published on the reviewed contact pages.

View source ↗ · Source checked 2026-10-22 · CMS External User Services identity and access support ↗ · CMS Medicare Provider Enrollment guide ↗

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Wait time: not establishedBest time from caller reports: not established. Published hours are not a wait forecast.

provider enrollment credentialing

NPPES NPI Enumerator help desk

Official page read
Phone800-465-3203

NPI Enumerator application/update and provider-record assistance

TTY phone800-692-2326

NPI Enumerator TTY

Published email

customerserviceNPIenumerator@cms.hhs.gov

NPI application/update assistance and provider NPI-record questions

Published hours

Not published in this record

Product, plan and location

other
National contact — confirm product and location

Mailing address
CMS NPI Enumerator Services Mail Stop DO-01-51 7500 Security Blvd. Baltimore, MD 21244

Completed signed NPI Application/Update Form (CMS-10114) paper applications.

The current CMS NPI application page and NPI Registry publish this CMS mailbox, replacing the inherited npienumerator.com mailbox. For NPI application/update and provider-record questions. Send completed signed paper NPI applications to the published Enumerator mail stop. No fax or service hours are published in these sources.

View source ↗ · Source checked 2026-10-22 · Source updated 2026-08-24 · CMS NPI Registry ↗

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Wait time: not establishedBest time from caller reports: not established. Published hours are not a wait forecast.

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Call preparation · editorial guide

Make the call count.

Track practice enrollment, network contracts and provider-directory changes through the correct administrative team.

Have ready in your secure workspace

  • Individual and group NPIs
  • Application reference, location and requested network
  • Submission dates and outstanding checklist

Questions to resolve

  • Was the application accepted as complete?
  • Are contracting and credentialing at different stages?
  • What effective date is confirmed in writing?

This is a general administrative checklist, not payer policy or advice about a particular patient. Confirm the current plan instructions.

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