Stefan Andrew Unterhalter, M.D.
NPI 1619023249ActiveIndividual· Internal Medicine, Nephrology· Beverly Hills, CA
Internal Medicine, Nephrology (M.D.) in Beverly Hills, California, licensed in CA, with an NPI issued in January 2007. Their prescriptions cost Medicare Part D more than their services did: $530,382 for 4,329 claims, against $106,773 paid for services in 2024. Bayer Healthcare Pharmaceuticals Inc. was the largest of 8 companies reporting payments in 2025, $831.33 in all, mostly food and beverage. Lists Cedars-Sinai Medical Center and 1 other hospital as hospital affiliations.
Overview
| NPI | 1619023249 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jan 26, 2007 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | A33152 | 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 - Nephrology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 311 |
|---|---|
| Services billed | 1,495 across 23 procedure codes |
| Paid by Medicare | $106,773 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,329 · 8,504 30-day fills |
|---|---|
| Patients | 317 |
| Total drug cost | $530,382 |
| Generic share | 84% of claims |
Education and affiliations
| Graduation year | 1972 |
|---|---|
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Hospital affiliations
- Cedars-Sinai Medical CenterLos Angeles, CA
- Providence Cedars Sinai Tarzana Medical CenterTarzana, CA
Other facilities
- Fmcna of Culver CityDialysis facility · Culver City, CA
Industry payments (Open Payments)
- 2025$831.33 · 10 payments from 8 companies
- 2024$605.07 · 9 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Bayer Healthcare Pharmaceuticals Inc. | $294.23 | 2 |
| Bridgebio Pharma, Inc. | $166.89 | 1 |
| Amgen Inc. | $120.67 | 1 |
| Corcept Therapeutics | $77.45 | 1 |
| Novo Nordisk Inc | $77.29 | 2 |
What the 2025 payments were for
- Food and Beverage$831.33 · 10 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 28 nephrologists in Beverly Hills · All nephrologists in California