Peter Lyon Greenberg, M.D.
NPI 1912033978ActiveIndividual· Internal Medicine, Hematology· Stanford, CA
Internal Medicine, Hematology (M.D.) in Stanford, California, trained at George Washington University School of Medicine (class of 1963). Medicare paid $18,606 for services to 82 patients in 2024. Sumitomo Pharma America, Inc. reported $16.15 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1912033978 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Feb 26, 2007 |
| Last updated in NPPES | Apr 26, 2024 |
| Certified by provider | Apr 26, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology Primary | 207RH0000X | G14630 | CA |
| Internal Medicine | 207R00000X | G14630 | 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 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Hematology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 82 |
|---|---|
| Services billed | 144 across 5 procedure codes |
| Paid by Medicare | $18,606 |
Education and affiliations
| Medical school | George Washington University School of Medicine |
|---|---|
| Graduation year | 1963 |
| Medicare specialty | Hematology |
| Telehealth | Offers telehealth |
Medical group
- Stanford Health CareStanford, CA · 3,122 clinicians
Hospital affiliation
- Stanford Health CareStanford, CA
Industry payments (Open Payments)
- 2025$16.15 · 1 payment from 1 company
- 2024$21.37 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sumitomo Pharma America, Inc. | $16.15 | 1 |
What the 2025 payments were for
- Food and Beverage$16.15 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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