Jeffrey Robert Unger, M.D.
NPI 1003856188ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Rancho Cucamonga, CA
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) in Rancho Cucamonga, California, trained at Northwestern University Feinberg Medical School (class of 1980). Their prescriptions cost Medicare Part D more than their services did: $2,053,074 for 2,398 claims, against $51,842 paid for services in 2024. Corcept Therapeutics was the largest of 13 companies reporting payments in 2025, $188,168 in all, mostly speaking and faculty fees.
Overview
| NPI | 1003856188 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jun 7, 2006 |
| Last updated in NPPES | May 18, 2026 |
| Certified by provider | May 18, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | G45569 | CA |
| Family Medicine | 207Q00000X | G45569 | 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 | 69 |
|---|---|
| Services billed | 1,025 across 43 procedure codes |
| Paid by Medicare | $51,842 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,398 · 4,153 30-day fills |
|---|---|
| Patients | 83 |
| Total drug cost | $2,053,074 |
| Generic share | 64% of claims |
Education and affiliations
| Medical school | Northwestern University Feinberg Medical School |
|---|---|
| Graduation year | 1980 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Family Practice |
Other facilities
- A and E Home Health Services, IncHome health agency · Upland, CA
- Achieva Hospice, IncHospice · Upland, CA
- Mission HospiceHospice · Pasadena, CA
Industry payments (Open Payments)
- 2025$188,168 · 255 payments from 13 companies
- 2024$87,712 · 134 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Corcept Therapeutics | $97,926 | 132 |
| Novo Nordisk Inc | $38,064 | 35 |
| Sanofi-Aventis U.S. LLC | $19,582 | 14 |
| Abbott Laboratories | $14,287 | 46 |
| Siemens Medical Solutions USA, Inc. | $6,581 | 5 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$123,240 · 45 payments
- Travel and Lodging$27,472 · 100 payments
- Honoraria$11,562 · 6 payments
- Compensation for serving as faculty or as a speaker for a medical education program$9,950 · 12 payments
- Consulting Fee$8,298 · 5 payments
- Food and Beverage$7,549 · 85 payments
- Education$97.26 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Endocrinology, Diabetes & Metabolism providers in Rancho Cucamonga
- 1508583089
- 1376940221
- 1427856608
- 1821295247
All Internal Medicine, Endocrinology, Diabetes & Metabolism providers in California →