Mark Kevin Horowitz, DO
NPI 1669413878ActiveIndividual· Dermatology· Torrance, CA
Dermatology (DO) in Torrance, California, licensed in CA, with an NPI issued in June 2006. 220 Medicare patients in 2024, $81,963 paid; nearly all of their 229 Part D prescriptions were generic (97%). Organon LLC reported $13.12 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1669413878 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | Jun 9, 2006 |
| Last updated in NPPES | Jan 17, 2014 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dermatology Primary | 207N00000X | 20A7642 | CA |
| Dermatology, MOHS-Micrographic Surgery | 207ND0101X | 20A7642 | CA |
| Dermatology, Dermatopathology | 207ND0900X | 20A7642 | CA |
| Dermatology, Clinical & Laboratory Dermatological Immunology | 207NI0002X | 20A7642 | CA |
| Dermatology, Pediatric Dermatology | 207NP0225X | 20A7642 | CA |
| Dermatology, Procedural Dermatology | 207NS0135X | 20A7642 | CA |
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 (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 220 |
|---|---|
| Services billed | 981 across 33 procedure codes |
| Paid by Medicare | $81,963 |
Part D prescriptions in 2024
| Prescriptions (claims) | 229 · 266 30-day fills |
|---|---|
| Patients | 100 |
| Total drug cost | $8,463 |
| Generic share | 97% of claims |
Industry payments (Open Payments)
- 2025$13.12 · 1 payment from 1 company
- 2024$71.06 · 3 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Organon LLC | $13.12 | 1 |
What the 2025 payments were for
- Food and Beverage$13.12 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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