As we noted in last month’s provider newsletter, beginning Jan. 1, 2026, Tufts Health One Care will become a Dual Eligible Special Needs Plan (D-SNP). As part of the transition to the new product, Tufts Health One Care members have been issued new member ID numbers.

To ensure uninterrupted care for members — and that your claims are processed and paid in a timely manner next year — please be sure to update your billing systems to reflect new ID numbers for One Care members beginning Jan. 1, 2026. If you bill for services delivered in 2026 using the previous ID number, your claim will be rejected and you will need to resubmit it with the correct member ID number.

Since One Care members have already received their new 2026 member ID cards, you can begin reaching out to them now to obtain their updated information. You may also obtain the updated member ID number in the secure provider portal. Here’s a sample image of the new Tufts Health One Care member ID:

 

Please keep in mind, as well, that members will be seamlessly transitioned to the updated product, and no action is required on their part. Any active prior authorizations with an end date after Dec. 31, 2025 will be automatically transferred to the member’s new ID number. These existing authorizations will remain valid until their specified end date, so no further steps are necessary on your part.

For further information, please refer to the November article.