Mark Andrew Willoughby, M.D.
NPI 1215931993ActiveIndividual· Dermatology· Chula Vista, CA
Dermatology (M.D.) in Chula Vista, California, trained at Ohio State University College of Medicine (class of 1997). 1,265 Medicare patients in 2024, $397,707 paid; nearly all of their 974 Part D prescriptions were generic (97%). Janssen Biotech, Inc. was the largest of 13 companies reporting payments in 2025, $1,307 in all, mostly food and beverage.
Overview
| NPI | 1215931993 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 9, 2005 |
| Last updated in NPPES | Jul 13, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dermatology Primary | 207N00000X | A69750 | 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 | 1,265 |
|---|---|
| Services billed | 22,853 across 67 procedure codes |
| Paid by Medicare | $397,707 |
Part D prescriptions in 2024
| Prescriptions (claims) | 974 · 1,086 30-day fills |
|---|---|
| Patients | 468 |
| Total drug cost | $67,027 |
| Generic share | 97% of claims |
Education and affiliations
| Medical school | Ohio State University College of Medicine |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Dermatology |
Medical group
- Dermatology and Laser Center of San DiegoChula Vista, CA · 9 clinicians
Industry payments (Open Payments)
- 2025$1,307 · 67 payments from 13 companies
- 2024$1,226 · 60 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $330.10 | 12 |
| Abbvie Inc. | $299.64 | 22 |
| Incyte Corporation | $189.14 | 8 |
| Sun Pharmaceutical Industries Inc. | $140.47 | 7 |
| Regeneron Healthcare Solutions, Inc. | $86.15 | 3 |
What the 2025 payments were for
- Food and Beverage$1,077 · 64 payments
- Education$229.97 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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