Stefan Eric Lowenstein, MD
NPI 1245728807ActiveIndividual· Dermatology· Mill Valley, CA
Dermatology (MD) in Mill Valley, California, trained at University of California, San Francisco School of Medicine (class of 2018). 672 Medicare patients in 2024, $243,596 paid; nearly all of their 550 Part D prescriptions were generic (97%). Leo Pharma Inc. was the largest of 16 companies reporting payments in 2025, $1,535 in all, mostly food and beverage.
Overview
| NPI | 1245728807 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Apr 28, 2018 |
| Last updated in NPPES | Apr 23, 2026 |
| Certified by provider | Apr 23, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dermatology Primary | 207N00000X | A165056 | CA |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
| Pathology, Dermatopathology | 207ZD0900X | A165056 | CA |
| Dermatology, MOHS-Micrographic Surgery | 207ND0101X | A165056 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 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 | 672 |
|---|---|
| Services billed | 3,174 across 71 procedure codes |
| Paid by Medicare | $243,596 |
Part D prescriptions in 2024
| Prescriptions (claims) | 550 · 683 30-day fills |
|---|---|
| Patients | 273 |
| Total drug cost | $59,929 |
| Generic share | 97% of claims |
Education and affiliations
| Medical school | University of California, San Francisco School of Medicine |
|---|---|
| Graduation year | 2018 |
| Medicare specialty | Dermatology |
Medical groups
- Union Square Dermatology A Professional CorporationSan Francisco, CA · 4 clinicians
- Aesthetic Dermatology and Cosmetic Surgery Medical Associates IncMill Valley, CA · 2 clinicians
Industry payments (Open Payments)
- 2025$1,535 · 65 payments from 16 companies
- 2024$2,027 · 87 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Leo Pharma Inc. | $442.68 | 24 |
| Galderma Laboratories, L.P. | $224.71 | 5 |
| Ucb, Inc. | $211.39 | 5 |
| Pfizer Inc. | $114.71 | 5 |
| Abbvie Inc. | $95.42 | 5 |
What the 2025 payments were for
- Food and Beverage$1,535 · 65 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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