John Mark Demay, MD
NPI 1366447294ActiveIndividual· Dermatology· Sioux City, IA
Dermatology (MD) in Sioux City, Iowa, trained at University of Nebraska College of Medicine (class of 1989). 945 Medicare patients in 2024, $828,811 paid; nearly all of their 670 Part D prescriptions were generic (98%). Janssen Biotech, Inc. was the largest of 8 companies reporting payments in 2025, $214.85 in all, mostly food and beverage.
Overview
| NPI | 1366447294 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jun 16, 2005 |
| Last updated in NPPES | Aug 16, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dermatology Primary | 207N00000X | 31906 | IA |
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 (IA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 945 |
|---|---|
| Services billed | 9,962 across 61 procedure codes |
| Paid by Medicare | $828,811 |
Part D prescriptions in 2024
| Prescriptions (claims) | 670 · 744 30-day fills |
|---|---|
| Patients | 296 |
| Total drug cost | $58,329 |
| Generic share | 98% of claims |
Education and affiliations
| Medical school | University of Nebraska College of Medicine |
|---|---|
| Graduation year | 1989 |
| Medicare specialty | Dermatology |
Medical group
- Dermatology Associates of Siouxland PCSioux City, IA · 3 clinicians
Hospital affiliation
- St Lukes Regional Medical CenterSioux City, IA
Industry payments (Open Payments)
- 2025$214.85 · 17 payments from 8 companies
- 2024$117.93 · 7 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $55.93 | 3 |
| Organon LLC | $42.16 | 7 |
| Galderma Laboratories, L.P. | $30.42 | 2 |
| Sun Pharmaceutical Industries Inc. | $23.86 | 1 |
| Novartis Pharmaceuticals Corporation | $17.45 | 1 |
What the 2025 payments were for
- Food and Beverage$214.85 · 17 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Dermatology providers in Sioux City
- 1740953439