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Direct Primary Care
Family Medicine

TriStar Health Center

Quick Facts

Membership Price Range$125/month (DPC Membership); New patient initial visit $150 first month
Practice TypeDirect Primary Care
LocationNorthborough
DoctorsDiana Trister DO, Family Medicine

About

At TriStar Health Center in Northborough, MA, Dr. Diana Trister, DO brings together Direct Primary Care, Regenerative Medicine, and Functional Medicine under one roof. She founded the practice to deliver unhurried, thorough care built on genuine collaboration between doctor and patient.

The membership costs $125 per month and covers unlimited office visits, same-day appointments, direct text and email access to Dr. Trister, and wholesale laboratory pricing. Appointments run up to 60 minutes, giving patients real time to explore root causes rather than surface symptoms. Beyond primary care, the practice offers an unusually broad clinical menu. Dr. Trister performs Prolotherapy, Platelet Rich Plasma therapy, Osteopathic Manipulation, IV Vitamin Therapy, hormone optimization, peptide therapy, and Semaglutide weight loss injections. Patients seeking functional health work can pursue gut microbiome evaluation and metabolic optimization. The practice prices every service transparently, with no hidden fees and no insurance billing complexity.

Details

Address

290 West Main Street, Unit 6, Northborough, MA 01532

Membership

$125/monthly

Membership Details

DPC Membership: $125/month. New patient initial visit $150 first month. Includes unlimited office visits, same/next day appointments, direct physician access (text/email), wholesale laboratory pricing, extended appointment times (up to 60 min), chronic disease management, preventative care & wellness exams.

Typical Appointment

60 minutes

Same-Day Appointments

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Frequently Asked Questions

The DPC membership at TriStar Health Center costs $125 per month. New patients pay $150 for their initial visit during the first month. The monthly fee covers unlimited office visits, same-day appointments, direct text and email access to Dr. Trister, wholesale laboratory pricing, and extended appointment times up to 60 minutes.

TriStar Health Center does not bill insurance for membership or primary care services. The practice uses transparent, flat-rate pricing with no hidden fees and no complicated billing. Patients pay directly, which keeps the focus on care rather than insurance paperwork. Some patients use HSA or FSA funds to cover membership costs.

Start by sending an introductory email to the practice describing your health concerns and goals. The team responds within 24 hours to schedule a phone consultation or in-person meeting. No insurance referral is required, and the practice welcomes new patients.

Yes. TriStar Health Center offers same-day and next-day appointments for members. Direct access and flexible scheduling are core benefits of the DPC membership.

Appointments run up to 60 minutes. That extended time allows Dr. Trister to conduct thorough evaluations, review labs, and discuss treatment options without rushing. Specialty consults for Functional Medicine or Sports Medicine run 60 to 90 minutes for initial visits.

TriStar Health Center offers a broad range of services including Prolotherapy, Neural Prolotherapy, Platelet Rich Plasma therapy, Osteopathic Manipulation, IV Vitamin Therapy, hormone optimization, peptide therapy, Semaglutide weight loss injections, gut microbiome evaluation, metabolic optimization, and aesthetic Botox. Dr. Trister performs all of these services in the office.

DPC members can reach Dr. Trister directly by text or email at any time. The practice also responds to introductory emails within 24 hours for prospective patients.

The practice operates Monday through Thursday from 9:00 am to 4:00 pm. The office is closed Friday through Sunday. Members can contact Dr. Trister directly by text or email outside of office hours.

Yes. Dr. Trister offers Semaglutide weight loss injections, compounded by Empower Pharmacy 503A and 503B. The program starts with a $99 consultation, and qualifying patients can receive their first injection the same day. Weekly injection pricing starts at $99 depending on dosage.

Yes. Non-members can schedule specialty consultations for Functional Medicine or Sports Medicine at $375 for an initial visit. Non-members can also access Osteopathic Manipulation, follow-up visits, and regenerative procedures at listed per-session rates.

Practice last updated April 10, 2026