Margaret M. Shannon, M.D.
NPI 1265449441ActiveIndividual· Dermatology· Costa Mesa, CA
Dermatology (M.D.) in Costa Mesa, California, trained at Georgetown University School of Medicine (class of 1979). 631 Medicare patients in 2024, $337,003 paid; nearly all of their 544 Part D prescriptions were generic (96%). Journey Medical Corporation was the largest of 14 companies reporting payments in 2025, $948.33 in all, mostly food and beverage.
Overview
| NPI | 1265449441 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Aug 1, 2006 |
| Last updated in NPPES | Aug 5, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dermatology Primary | 207N00000X | G42251 | 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 | 631 |
|---|---|
| Services billed | 6,231 across 52 procedure codes |
| Paid by Medicare | $337,003 |
Part D prescriptions in 2024
| Prescriptions (claims) | 544 · 604 30-day fills |
|---|---|
| Patients | 243 |
| Total drug cost | $105,394 |
| Generic share | 96% of claims |
Education and affiliations
| Medical school | Georgetown University School of Medicine |
|---|---|
| Graduation year | 1979 |
| Medicare specialty | Dermatology |
Industry payments (Open Payments)
- 2025$948.33 · 23 payments from 14 companies
- 2024$284.02 · 12 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Journey Medical Corporation | $212.32 | 2 |
| Sun Pharmaceutical Industries Inc. | $116.95 | 1 |
| Genzyme Corporation | $105.09 | 3 |
| Eli Lilly and Company | $99.00 | 1 |
| Leo Pharma Inc. | $90.94 | 3 |
What the 2025 payments were for
- Food and Beverage$849.33 · 22 payments
- Education$99.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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