Medicare AdvantageAdministrativeHigh impact
Tufts Health One Care: Reminder to use new member ID numbers in 2026
Harvard Pilgrim Health Care·Provider Newsletter
Effective date
Jan 1, 2026
We identified it
Jun 20, 2026
Summary
Tufts Health One Care is transitioning to a Dual Eligible Special Needs Plan (D-SNP) on January 1, 2026, requiring all members to receive new ID numbers. Billing teams must update their systems with the new member ID numbers to avoid claim rejections for services provided in 2026.
Action Required
Before January 1, 2026: Billing team must contact all Tufts Health One Care members to obtain their new 2026 member ID numbers and update billing systems accordingly. Access new ID numbers through the secure provider portal or request updated cards from patients. Claims submitted with old ID numbers for 2026 services will be rejected and require resubmission.