Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Oliver John Preston Barnyak, MD

Individual provider Emergency Medicine Physician · NPI 1831693787

Oliver John Preston Barnyak, MD is an Emergency Medicine in Randolph, Vermont. Graduated from Geisel School of Medicine at Dartmouth in 2018, 8 years ago. Practices with Dartmouth-Hitchcock Clinic, a 1,430-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in New Hampshire and Vermont.

Years since qualifying
8
Trained at
Geisel School of Medicine at Dartmouth
Licensed in
NH, VT
In the registry since
2018
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

44 S Main St
Randolph, VT 05060-1381
Phone: (802) 728-7000
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 1 Medical Center Dr, Lebanon, NH 03756-0001 — (603) 650-5000
  • 10 Alice Peck Day Dr, Lebanon, NH 03766-2900 — (603) 448-3121
  • 273 County Rd, New London, NH 03257-5736 — (603) 526-2911

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 33916 (NH)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 042.0015341 (VT)

Record details

NPI number1831693787
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 23, 2018
Last updated in NPPESNovember 22, 2024
Certification dateNovember 22, 2024

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolGEISEL SCHOOL OF MEDICINE AT DARTMOUTH
Graduated 2018 (8 years in practice)
Group practice Dartmouth-Hitchcock Clinic — 1430 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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