Gary Guo, MD
NPI 1932129582ActiveIndividual· Internal Medicine· Valhalla, NY
Internal Medicine (MD) with Westchester Medical Center Advanced Physician Services PC, practicing in Valhalla, New York. Mostly services rather than prescriptions: Medicare paid $48,434 for 196 patients in 2024, with only 19 Part D claims. Alexion Pharmaceuticals, Inc. was the largest of 4 companies reporting payments in 2025, $624.41 in all, mostly food and beverage. Lists Westchester Medical Center as a hospital affiliation.
Overview
| NPI | 1932129582 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 19, 2006 |
| Last updated in NPPES | Feb 29, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 234103 | NY |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 196 |
|---|---|
| Services billed | 681 across 7 procedure codes |
| Paid by Medicare | $48,434 |
Part D prescriptions in 2024
| Prescriptions (claims) | 19 · 30 30-day fills |
|---|---|
| Total drug cost | $1,460 |
| Generic share | 74% of claims |
Education and affiliations
| Graduation year | 1982 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Westchester Medical Center Advanced Physician Services PCValhalla, NY · 897 clinicians
Hospital affiliation
- Westchester Medical CenterValhalla, NY
Industry payments (Open Payments)
- 2025$624.41 · 16 payments from 4 companies
- 2024$438.22 · 16 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alexion Pharmaceuticals, Inc. | $347.97 | 3 |
| Pfizer Inc. | $190.11 | 10 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $48.75 | 2 |
| Biogen, Inc. | $37.58 | 1 |
What the 2025 payments were for
- Food and Beverage$624.41 · 16 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 69 internal medicine physicians in Valhalla · All internal medicine physicians in New York