| Vendor | Products | Services | Details and contact info |
| Carelon Medical Benefits Management (formerly AIM Specialty Health) | Harvard Pilgrim Health Care Commercial, Harvard Pilgrim Health Care Stride (HMO/HMO-POS) Medicare Advantage, Tufts Health Direct, Tufts Health Plan Together, Tufts Health Plan RITogether, Tufts Health One Care | Genetic and Molecular Diagnostic Testing | View details |
| EviCore | Tufts Health Plan Commercial, Tufts Health Direct, Tufts Health Plan Together, Tufts Health Medicare Preferred (for Harvard Pilgrim members, refer to Evolent below) |
| View details |
| Evolent (formerly National Imaging Associates/NIA) | Harvard Pilgrim Health Care Commercial, Harvard Pilgrim Health Care Stride (HMO/HMO-POS) Medicare Advantage, Tufts Health Plan Commercial, Tufts Health Direct, Tufts Health Plan Together, Tufts Health Plan RITogether, Tufts Health One Care |
| View details |
| OncoHealth (formerly Oncology Analytics) | Harvard Pilgrim Health Care Commercial, Harvard Pilgrim Health Care Stride (HMO/HMO-POS) Medicare Advantage | Outpatient chemotherapy (infused and/or injected) | View details |
| Optum/United Behavioral Health | Harvard Pilgrim Health Care Stride (HMO/HMO-POS) Medicare Advantage | Behavioral Health for Stride (HMO)/(HMO-POS) Medicare Advantage | View details |
| Progeny Health | Harvard Pilgrim Health Care Commercial | Non-routine newborn care (Level II-IV) and all neonatal intensive care unit (NICU) admissions | View details |