Tatiana Grzeszkiewicz, M.D., PH.D.
NPI 1841386489ActiveIndividual· Dermatology· Fremont, CA
Dermatology (M.D., PH.D.) in Fremont, California, trained at University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) (class of 2003). Their prescriptions cost Medicare Part D more than their services did: $534,416 for 1,743 claims, against $195,529 paid for services in 2024. Galderma Laboratories, L.P. was the largest of 3 companies reporting payments in 2025, $279.86 in all, mostly food and beverage.
Overview
| NPI | 1841386489 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D., PH.D. |
| Sole proprietor | No |
| NPI issued | Oct 4, 2006 |
| Last updated in NPPES | Jun 4, 2020 |
| Certified by provider | Jun 4, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dermatology Primary | 207N00000X | A88967 | CA |
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 - Dermatology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 849 |
|---|---|
| Services billed | 2,962 across 45 procedure codes |
| Paid by Medicare | $195,529 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,743 · 2,117 30-day fills |
|---|---|
| Patients | 608 |
| Total drug cost | $534,416 |
| Generic share | 93% of claims |
Education and affiliations
| Medical school | University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) |
|---|---|
| Graduation year | 2003 |
| Medicare specialty | Dermatology |
| Telehealth | Offers telehealth |
Medical group
- Sutter Bay Medical FoundationFremont, CA · 3,829 clinicians
Industry payments (Open Payments)
- 2025$279.86 · 3 payments from 3 companies
- 2024$125.00 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Galderma Laboratories, L.P. | $149.00 | 1 |
| Lilly USA, LLC | $115.59 | 1 |
| Pfizer Inc. | $15.27 | 1 |
What the 2025 payments were for
- Food and Beverage$264.59 · 2 payments
- Education$15.27 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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