When Tufts Health One Care became a Dual Eligible Special Needs Plan (D-SNP) beginning Jan. 1, 2026, all Tufts Health One Care members were issued new member ID numbers and ID cards. We continue to receive claims submitted with outdated or incorrect member IDs, which results in an automatic denial. 

To ensure that your claims are accepted for processing, it’s important to update your billing systems to reflect the new member ID numbers for One Care members as of Jan. 1, 2026, if you have not already done so. You can distinguish the new 2026 ID numbers by the fact that they begin with the letter “P.” 

Please keep the following in mind:

  • Claims for services delivered in 2026 that are submitted using a previous or incorrect member ID will be denied for member ineligibility.
  • Correcting or adjusting a denied claim will not resolve the denial. 
  • If your claim is denied due to an incorrect member ID, you must submit a new claim using the correct member ID number in order to be eligible for payment. 

We encourage you to remind office staff to request member ID cards from patients at the time of service. 

Below is a sample image of the new Tufts Health One Care member ID:

Submitting claims correctly the first time helps prevent delays and reduces administrative rework for both providers and members. Thank you for your cooperation in using the appropriate member ID number for Tufts Health One Care members.