Mary F. Fredenberg, MD
NPI 1134140999ActiveIndividual· Dermatology· Peoria, AZ
Dermatology (MD) in Peoria, Arizona, trained at University of Arizona College of Medicine (class of 1982). 811 Medicare patients in 2024, $227,403 paid; nearly all of their 896 Part D prescriptions were generic (94%). Pfizer Inc. was the largest of 12 companies reporting payments in 2025, $1,180 in all, mostly food and beverage.
Overview
| NPI | 1134140999 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 21, 2006 |
| Last updated in NPPES | Aug 13, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dermatology Primary | 207N00000X | 16095 | AZ |
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 (AZ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 811 |
|---|---|
| Services billed | 5,230 across 30 procedure codes |
| Paid by Medicare | $227,403 |
Part D prescriptions in 2024
| Prescriptions (claims) | 896 · 1,273 30-day fills |
|---|---|
| Patients | 372 |
| Total drug cost | $260,124 |
| Generic share | 94% of claims |
Education and affiliations
| Medical school | University of Arizona College of Medicine |
|---|---|
| Graduation year | 1982 |
| Medicare specialty | Dermatology |
Medical group
- Southwest Skin Specialists LLCScottsdale, AZ · 52 clinicians
Industry payments (Open Payments)
- 2025$1,180 · 44 payments from 12 companies
- 2024$1,373 · 61 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $414.12 | 5 |
| Novartis Pharmaceuticals Corporation | $190.48 | 7 |
| Ucb, Inc. | $174.24 | 9 |
| Abbvie Inc. | $150.92 | 9 |
| Regeneron Healthcare Solutions, Inc. | $54.51 | 3 |
What the 2025 payments were for
- Food and Beverage$874.93 · 43 payments
- Education$305.40 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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