Gregory Gunyan, D.O.
NPI 1528386265 · Psychiatry Physician · Smithtown, NY
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Gunyan, D.O. is a Psychiatry Physician provider in Smithtown, NY (NPI 1528386265).
Provider details
- NPI number
- 1528386265
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
16 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
196 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 110 | $73 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 55 | $107 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 31 | $87 |
Typical Medicare-allowed amounts for these services range $73–$107 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 51 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Clonazepam | 187 | 34 |
| Quetiapine Fumarate | 172 | 28 |
| Venlafaxine Hclbrand: Venlafaxine Hcl Er | 139 | 18 |
| Sertraline Hcl | 131 | 25 |
| Aripiprazole | 125 | 19 |
| Duloxetine Hcl | 124 | 21 |
| Alprazolam |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$936 across 23 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-05-05
- Last updated
- 2014-11-14
Frequently asked questions
- What is Gregory Gunyan's NPI number?
- Gregory Gunyan's National Provider Identifier (NPI) is 1528386265, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Gunyan's specialty?
- Gregory Gunyan is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Gunyan located?
- Gregory Gunyan's practice location on file with NPPES is 222 E Middle Country Rd Ste 111, Smithtown, NY 11787-2873.
- What is Gregory Gunyan's phone number?
- The practice phone number listed in the NPPES registry for Gregory Gunyan is (631) 265-1622.
- Does Gregory Gunyan accept Medicare?
- Gregory Gunyan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Gunyan's NPI active?
- Yes — Gregory Gunyan's NPI (1528386265) is active in the NPPES registry as of the last update on 2014-11-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.