All inquiries and comments regarding Trading Partner registration, connection set-up, transaction testing, and the submission of 270/271 transactions and interpretation of their data should be directed to the MCARE Help Desk (MCARE).

MCARE is typically open Monday through Friday, from 7 am to 7 pm ET.  MCARE is closed on federal holidays and may have modified hours on the day before or after a holiday. MCARE will send an email reminder to subscribed users two business days before a federal holiday. 

If you encounter a significant HETS issue outside of operational hours, call the MCARE Help Desk and leave a voicemail. 

• mcare@cms.hhs.gov
• 1-866-324-7315

Note: The MCARE email address is monitored during normal business hours. Emails are typically answered within one business day. 

MCARE cannot assist in the resolution of benefit-related discrepancies. Questions regarding eligibility/benefit data for Medicare Part A and Part B should be directed to the appropriate regional MAC. Eligibility/benefit questions about MA, Part D, and MSP should be directed to the appropriate plan(s) identified in the 271 response.

Listed below are holiday closure dates and times.