Mark William Guelzow, MD
NPI 1124477484ActiveIndividual· Family Medicine· Fayetteville, NY
Family Medicine (MD) with Chs Physician Partners PC, practicing in Fayetteville, New York. 397 Medicare patients in 2024, $177,563 paid; nearly all of their 2,945 Part D prescriptions were generic (94%). Pfizer Inc. was the largest of 2 companies reporting payments in 2025, $46.50 in all, mostly food and beverage. Lists Good Samaritan Hospital Medical Center and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1124477484 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 8, 2016 |
| Last updated in NPPES | Jul 3, 2021 |
| Certified by provider | Jul 3, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 301689 | NY |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Family Practice (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 397 |
|---|---|
| Services billed | 2,488 across 43 procedure codes |
| Paid by Medicare | $177,563 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,945 · 7,266 30-day fills |
|---|---|
| Patients | 373 |
| Total drug cost | $120,042 |
| Generic share | 94% of claims |
Education and affiliations
| Graduation year | 2016 |
|---|---|
| Medicare specialty | Family Practice |
| Telehealth | Offers telehealth |
Medical group
- Chs Physician Partners PCRoslyn, NY · 743 clinicians
Hospital affiliations
- Good Samaritan Hospital Medical CenterWest Islip, NY
- St Catherine of Siena HospitalSmithtown, NY
- St Charles HospitalPort Jefferson, NY
- Suny/Stony Brook University HospitalStony Brook, NY
Other facilities
- Catholic Home CareHome health agency · Farmingdale, NY
- Tender Loving Care, An Amedisys CompanyHome health agency · Medford, NY
Industry payments (Open Payments)
- 2025$46.50 · 3 payments from 2 companies
- 2024$65.06 · 3 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $29.50 | 2 |
| Novo Nordisk Inc | $17.00 | 1 |
What the 2025 payments were for
- Food and Beverage$46.50 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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