Whom should I contact with Medicare questions?

The table below is a guide to assist suppliers in contacting the correct Medicare contractor when questions arise regarding specific topics.

Contact the NSC with
questions regarding
Contact your DME MAC
with questions regarding
Contact the CMS External
User Services (EUS) Helpdesk
with questions regarding
  • The CMS 855S application form
  • The application process
  • Site visits
  • Licensure requirements
  • The Medicare DMEPOS supplier standards
  • NSC education opportunities
  • Changes in supplier information
  • 'DNF' (do not forward) issues
  • Reactivation of billing privileges
  • Supplier fraud
  • Appeal process (for denied/revoked billing privileges)
  • Voluntary termination of billing privileges
  • Claims processing
  • Payment questions and issues
  • EDI / electronic claims processing
  • Electronic funds transfers
  • Documentation requirements
  • Pricing
  • Appeals process of claims payments
  • Fraud and abuse

  •  PECOS navigation or systems issues

Locate contact information for the NSC.

Also, many of your billing questions may be answered by reviewing the information contained on your DME MAC's respective websites. Please click on the appropriate link below to review the information available on these websites.

Suppliers may also contact their DME MAC with questions regarding:

  • Education via on-site visits (some DME MACs may not offer this)
  • Educational workshops and seminars
  • Clarification on billing instructions
  • Guidance on problem-solving approaches to claims and billing

For information regarding benefit integrity or medical review issues, please contact the Program Safeguard Contractor (PSC) or Zone Protection Integrity Contractor (ZPIC) responsible for your state.

Contact NSC

Email National Supplier Clearinghouse

Contact a specific NSC department

Telephone: 866-238-9652

IVR: 866-238-9652


National Supplier Clearinghouse

Palmetto GBA, AG-495

P.O. Box 100142

Columbia, SC 29202-3142

Other Palmetto GBA Sites

Palmetto GBA Home

DMEPOS Competitive Bidding Program

Jurisdiction J Part A MAC

Jurisdiction J Part B MAC

Jurisdiction M Part A MAC

Jurisdiction M Part B MAC

Jurisdiction M Home Health and Hospice MAC


National Supplier Clearinghouse MAC


RRB Specialty MAC Providers

RRB Specialty MAC Beneficiaries




File Attachment Icon
DME MAC Contact Information.pdf