Samuel Jacob Klempner, M.D
NPI 1134329378ActiveIndividual· Internal Medicine, Hematology & Oncology· Boston, MA
Internal Medicine, Hematology & Oncology (M.D) in Boston, Massachusetts, trained at University of Massachusetts Medical School (class of 2007). In 2024 Medicare paid $72,176 for 176 patients, and Part D covered 168 of their prescriptions, 89% of them generic. Astrazeneca Uk Limited was the largest of 7 companies reporting payments in 2025, $34,076 in all, mostly consulting fees.
Overview
| NPI | 1134329378 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D |
| Sole proprietor | No |
| NPI issued | Jul 24, 2007 |
| Last updated in NPPES | Aug 14, 2026 |
| Certified by provider | Aug 14, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | A125171 | CA |
| Internal Medicine | 207R00000X | 232414 | MA |
| Internal Medicine, Hematology | 207RH0000X | 243585 | MA |
| Internal Medicine, Medical Oncology | 207RX0202X | 243585 | MA |
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 - Hematology/Oncology (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 176 |
|---|---|
| Services billed | 944 across 9 procedure codes |
| Paid by Medicare | $72,176 |
Part D prescriptions in 2024
| Prescriptions (claims) | 168 · 207 30-day fills |
|---|---|
| Patients | 54 |
| Total drug cost | $11,664 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | University of Massachusetts Medical School |
|---|---|
| Graduation year | 2007 |
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Massachusetts General Physicians Organization IncBoston, MA · 3,558 clinicians
- The General Hospital CorporationBoston, MA · 1,267 clinicians
Hospital affiliations
- Brigham and Women's HospitalBoston, MA
- Cooley Dickinson Hospital Inc,theNorthampton, MA
- Massachusetts General HospitalBoston, MA
- Newton-Wellesley HospitalNewton, MA
- North Shore Medical Center -Salem, MA
Other facilities
- Mass General Brigham Home Care, IncHome health agency · Newton, MA
- Care Dimensions, IncHospice · Danvers, MA
Industry payments (Open Payments)
- 2025$34,076 · 25 payments from 7 companies
- 2024$43,498 · 25 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Uk Limited | $13,198 | 6 |
| Astrazeneca Pharmaceuticals LP | $10,930 | 7 |
| Astellas Pharma Europe Ltd | $5,989 | 5 |
| Gilead Sciences, Inc. | $2,986 | 3 |
| Jazz Pharmaceuticals Inc. | $837.00 | 1 |
What the 2025 payments were for
- Consulting Fee$33,006 · 12 payments
- Food and Beverage$577.29 · 10 payments
- Travel and Lodging$492.40 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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