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.
Date | Holiday | MCARE Operational Status |
Monday, December 25, 2023 | Christmas Day | Closed |
Monday, January 1, 2024 | New Year’s Day | Closed |
Monday, January 15, 2024 | Birthday of Martin Luther King, Jr. | Closed |
Monday, February 19, 2024 | Washington’s Birthday | Closed |
Monday, May 27, 2024 | Memorial Day | Closed |
Wednesday, June 19, 2024 | Juneteenth National Independence Day | Closed |
Thursday, July 4, 2024 | Independence Day | Closed |
Friday, July 5, 2024 | Open 8:00 AM - 5:00 PM ET | |
Monday, September 2, 2024 | Labor Day | Closed |
Monday, October 14, 2024 | Columbus Day | Closed |
Monday, November 11, 2024 | Veterans Day | Closed |
Thursday, November 28, 2024 | Thanksgiving Day | Closed |
Friday, November 29, 2024 | Open 8:00 AM - 5:00 PM ET | |
Wednesday, December 25, 2024 | Christmas Day | Closed |
Thursday, December 26, 2024 | Open 8:00 AM - 5:00 PM ET | |
Tuesday, December 31, 2024 | New Year's Eve | Open 8:00 AM - 5:00 PM ET |