Dr. Oliver John Preston Barnyak, MD
- Medicare services, 2024
- 12
- Medicare patients, 2024
- 39
- Part D claims, 2024
- 108
- Hospital affiliations
- 4
- Medical groups
- 7
- Practice address
- 44 South Main Street, Randolph, VT 05060
- Practice phone
- Call (802) 728-4441
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Barnyak's professional email, personal email and mobile number
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Dr. Oliver John Preston Barnyak is an emergency medicine physician in Randolph, Vermont
Dr. Barnyak practices at Gifford Medical Center in Randolph, Vermont, part of Gifford Health Care.
Dr. Barnyak's NPI, 1831693787, was assigned on March 23, 2018. Dr. Barnyak graduated from Geisel School of Medicine at Dartmouth in 2018. Dr. Barnyak holds New Hampshire license 33916.
- NPI
- 1831693787NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2062769490
- NPI enumeration date
- March 23, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (802) 728-4441
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Oliver John Preston Barnyak practices at Gifford Medical Center in Randolph, Vermont
Dr. Barnyak's primary practice is Gifford Medical Center, at 44 South Main Street, Randolph, VT 05060 in Orange County. The practice phone is (802) 728-4441.
- Gifford Medical Center44 South Main Street, Randolph, VT 05060 · Orange CountyPhone(802) 728-4441
Source: Dmand AI Affiliation Data
Dr. Oliver John Preston Barnyak is affiliated with 4 sites of care and 7 medical groups
Dr. Barnyak's primary practice is Gifford Medical Center in Randolph, Vermont, part of Gifford Health Care. Dr. Barnyak is also affiliated with Dartmouth Hitchcock Medical Center. The medical group on file is Dartmouth Hitchcock Clinics Manchester. Dmand AI also links Dr. Barnyak to 2 more hospitals and 6 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Oliver John Preston Barnyak's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Barnyak practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Gifford Medical Center | Available with a free account |
| +3 more sites and 6 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Gifford Health Care and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Oliver John Preston Barnyak is one of 174 emergency medicine physicians in Vermont
Emergency medicine is Dr. Barnyak's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dmand AI has Dr. Barnyak's licenses on file in 2 states: New Hampshire and Vermont.
Specialties and state licenses
- Emergency medicine, New HampshirePrimary
- Vermont license
Emergency medicine physicians near Dr. Barnyak
Counts of emergency medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Oliver John Preston Barnyak billed Medicare for 12 services in 2024
CMS data shows 12 Medicare services from Dr. Barnyak across 1 procedure code in 2024, for 39 Medicare patients. Medicare paid $1,504 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Barnyak's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 582024: 1279%
Dr. Barnyak compared with the Vermont median for emergency medicine physicians, 2024
- Dr. Barnyak
- Vermont median
- Medicare services
- 12vs 24695% below
- Medicare patients
- 39vs 27886% below
- Part D claims
- 17vs 2839% below
Medians across 181 emergency medicine physicians in Vermont with Dmand AI profiles that report each measure.
Dr. Barnyak's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Oliver John Preston Barnyak treated 39 Medicare patients in 2024, average age 71
CMS counts 39 Medicare patients who saw Dr. Barnyak in 2024. The largest group is 65 to 74, with 13 patients. 75% of them have high blood pressure, and 56% have high cholesterol. 46% are also on Medicaid. Their average risk score is 1.84, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Barnyak's median patient age at 48, with 59% women.
Dr. Barnyak's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Barnyak's Medicare patients by sex, 2024
- Women2154%
- Men1846%
Chronic conditions among Dr. Barnyak's Medicare patients, 2024
- High blood pressure75%
- High cholesterol56%
- Anxiety44%
- Depression38%
- Mood disorders38%
- Atrial fibrillation33%
- Arthritis31%
- Alcohol and drug use disorders28%
Share of Medicare patients with each condition. A patient can have several.
Dr. Barnyak's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 48
Patient panel by sex, all payers
- Women59%
- Men41%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Oliver John Preston Barnyak wrote 108 Medicare Part D claims in 2024
In 2024, Dr. Barnyak wrote 108 Medicare Part D claims for 86 patients. 93% of them were for generic drugs. CMS names the drug for 17 of them, across 1 drug with 11 or more claims each, at $130 in total drug cost. In 2023, CMS named 42 claims across 3 drugs.
Dr. Barnyak's Part D claims by kind of drug, 2024
- Generic100 claims93%
- Brand-name and other8 claims7%
Dr. Barnyak's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Barnyak's Part D claims, 2024
- Antibiotics44%48 of 108 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 422024: 1760%
Drugs named by CMS: 1 in 2024, 3 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Oliver John Preston Barnyak takes part in Medicare
Dr. Barnyak accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Oliver John Preston Barnyak graduated from Geisel School of Medicine at Dartmouth
Dr. Barnyak graduated from Geisel School of Medicine at Dartmouth in 2018.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Oliver John Preston Barnyak's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Oliver John Preston Barnyak
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Oliver John Preston Barnyak's NPI number?
Dr. Oliver John Preston Barnyak's NPI number is 1831693787. It was assigned on March 23, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. Oliver John Preston Barnyak?
Dr. Oliver John Preston Barnyak is an emergency medicine physician in Randolph, Vermont. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Oliver John Preston Barnyak practice?
Dr. Barnyak practices at 44 South Main Street, Randolph, VT 05060. Dr. Barnyak's primary practice is Gifford Medical Center in Randolph, Vermont, part of Gifford Health Care. Dmand AI also links Dr. Barnyak to 2 hospitals and 6 medical groups.
What is Dr. Oliver John Preston Barnyak's office phone number?
The practice phone on file for Dr. Barnyak is (802) 728-4441.
What is Dr. Oliver John Preston Barnyak's medical license number?
Dr. Barnyak holds New Hampshire license 33916, one of the licenses on file in 2 states.
Which states has Dr. Oliver John Preston Barnyak been licensed in?
Dmand AI has state licenses on file for Dr. Barnyak in New Hampshire and Vermont.
Which hospitals is Dr. Oliver John Preston Barnyak affiliated with?
Dr. Barnyak practices at Gifford Medical Center in Randolph, Vermont. Dr. Barnyak is also affiliated with Dartmouth Hitchcock Medical Center. Dmand AI links Dr. Barnyak to 2 more hospitals.
What medical group is Dr. Oliver John Preston Barnyak part of?
Dr. Barnyak is linked to Dartmouth Hitchcock Clinics Manchester. Dmand AI links Dr. Barnyak to 6 more medical groups.
Does Dr. Oliver John Preston Barnyak accept Medicare?
Yes. CMS data shows Dr. Barnyak billed Medicare for 12 services in 2024, and Dr. Barnyak accepts Medicare assignment.
How many Medicare patients does Dr. Oliver John Preston Barnyak see?
CMS counts 39 Medicare patients who saw Dr. Barnyak in 2024, with an average age of 71.
Show 4 more questionsShow fewer questions
What services does Dr. Oliver John Preston Barnyak bill to Medicare?
In 2024, Dr. Barnyak's most billed Medicare services were emergency department visit (99285).
Where did Dr. Oliver John Preston Barnyak go to medical school?
Dr. Barnyak graduated from Geisel School of Medicine at Dartmouth in 2018.
What drugs does Dr. Oliver John Preston Barnyak prescribe most?
In 2024 Medicare Part D data, Dr. Barnyak's most prescribed drugs by claims were Cephalexin.
How long has Dr. Oliver John Preston Barnyak been practicing?
Dr. Barnyak graduated from medical school in 2018, 8 years ago.
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