Mark L. Geller, M.D.
NPI 1093710345ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Tarzana, CA
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) in Tarzana, California, trained at University of California, San Diego School of Medicine (class of 1985). Their prescriptions cost Medicare Part D more than their services did: $816,352 for 5,501 claims, against $109,158 paid for services in 2024. Stryker Corporation reported $73.14 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1093710345 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 14, 2005 |
| Last updated in NPPES | Oct 23, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | G60287 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 314 |
|---|---|
| Services billed | 2,090 across 61 procedure codes |
| Paid by Medicare | $109,158 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,501 · 13,449 30-day fills |
|---|---|
| Patients | 478 |
| Total drug cost | $816,352 |
| Generic share | 81% of claims |
Education and affiliations
| Medical school | University of California, San Diego School of Medicine |
|---|---|
| Graduation year | 1985 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Providence Facey Medical FoundationValencia, CA · 385 clinicians
Hospital affiliation
- UCLA West Valley Medical CenterWest Hills, CA
Industry payments (Open Payments)
- 2025$73.14 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Stryker Corporation | $73.14 | 2 |
What the 2025 payments were for
- Food and Beverage$73.14 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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