William T. Ko, M.D.
NPI 1841230976ActiveIndividual· Dermatology· Phoenix, AZ
Dermatology (M.D.) in Phoenix, Arizona, trained at Northeastern Ohio University College of Medicine (class of 1994). 780 Medicare patients in 2024, $653,201 paid; nearly all of their 1,368 Part D prescriptions were generic (92%). Amgen Inc. was the largest of 25 companies reporting payments in 2025, $3,145 in all, mostly food and beverage.
Overview
| NPI | 1841230976 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 7, 2006 |
| Last updated in NPPES | Oct 25, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dermatology Primary | 207N00000X | 26333 | AZ |
| Dermatology, MOHS-Micrographic Surgery | 207ND0101X | 26333 | AZ |
| Dermatology, Procedural Dermatology | 207NS0135X | 26333 | AZ |
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 (AZ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 780 |
|---|---|
| Services billed | 26,057 across 70 procedure codes |
| Paid by Medicare | $653,201 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,368 · 1,533 30-day fills |
|---|---|
| Patients | 643 |
| Total drug cost | $630,501 |
| Generic share | 92% of claims |
Education and affiliations
| Medical school | Northeastern Ohio University College of Medicine |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | Dermatology |
Medical group
- Center for Dermatology PLLCScottsdale, AZ · 71 clinicians
Industry payments (Open Payments)
- 2025$3,145 · 151 payments from 25 companies
- 2024$2,714 · 153 payments from 21 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $477.10 | 8 |
| Leo Pharma Inc. | $381.11 | 21 |
| Abbvie Inc. | $360.82 | 22 |
| Janssen Biotech, Inc. | $253.63 | 15 |
| Regeneron Healthcare Solutions, Inc. | $251.67 | 8 |
What the 2025 payments were for
- Food and Beverage$3,145 · 151 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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