Gregory J. Gunyan, D.O.
Psychiatry Physician · Smithtown, NY
Gregory J. Gunyan, D.O. is a psychiatry physician with a practice address in Smithtown, New York, and NPI 1528386265, issued on May 5, 2010. Check the license (New York 267344, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Gregory J. Gunyan
- Credential
- D.O.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 267344 NY
Self-reported in NPPES; status is on the state search - Practice location
- 222 E Middle Country RD Ste 111, Smithtown, NY 11787
- Phone
- (631) 265-1622
- Enumerated
- May 5, 2010
- Record last updated
- Nov 14, 2014 (not updated in 12 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20160531000184); accepts Medicare assignment
- Medical or professional school
- New York College Of Osteo Medicine Of New York Institute Of Technology, 2009
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 6,589 in New York → Look up another NPI →
Verify Gregory J. Gunyan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 267344Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.2 times the Medicare Part D claims of the average psychiatry physician in 2024
3,202 Medicare Part D claims for 179 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Clonazepam187 claims
- Quetiapine Fumarate172 claims
- Venlafaxine Hcl Er139 claims
- Sertraline Hcl131 claims
- Aripiprazole125 claims
- Duloxetine Hcl124 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $935.62
23 payments; by number, the most common kind was food and beverage; the largest payer was Alkermes, Inc. The 13,693 providers of this specialty with any payment received $4,954.93 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- South Nassau Communities HospitalOceanside, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory J. Gunyan among 6,589 psychiatry physician records in New York
Gregory J. Gunyan, D.O. is one of 6,589 psychiatry physician records with a practice address in New York. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 65% of them.
- NPI issued2010 · 65% of these records are older, 32% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 39% of these records are
- Graduated2009 · median 2002 among the 2,559 with a school on file
- Record last updated2014 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
22 psychiatry physician records list a practice address in Smithtown
They are 22 of the 1,907 NPPES records with a practice address in Smithtown, and 6,589 psychiatry physician records in New York.
All 6,589 in New York → Every provider in Smithtown → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Devendra Amin, M.D.Smithtown, NY 117871780696914
- Thomas Aronson, MDSmithtown, NY 117871669400750
- Christopher Burke, M.D.Smithtown, NY 117871427099621
- Karin Burkhard, MDSmithtown, NY 117871013071323
- Robert Castroll, MDSmithtown, NY 117871407929003
- Ashvin Doshi, M.D.Smithtown, NY 117871477564268
- Shelley Epstein, MDSmithtown, NY 117871255407987
- Praful Joshi, MDSmithtown, NY 117871326059601
Common questions
What is Gregory J. Gunyan, D.O.'s NPI number?
Gregory J. Gunyan, D.O.'s National Provider Identifier (NPI) is 1528386265, issued on May 5, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Gregory J. Gunyan, D.O. located?
The NPPES record lists a practice address at 222 E Middle Country RD Ste 111, Smithtown, NY, 11787. Phone: (631) 265-1622. Providers update this record themselves, so call before visiting.
How can I verify Gregory J. Gunyan, D.O.'s license?
NPPES lists New York license number 267344, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory J. Gunyan, D.O. prescribe under Medicare Part D?
In 2024, Gregory J. Gunyan, D.O. had 3,202 Medicare Part D claims for 179 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.