Karen Theo Isselbacher, MD
NPI 1508822867ActiveIndividual· Internal Medicine· Wellesley, MA
Internal Medicine (MD) in Wellesley, Massachusetts, trained at Boston University School of Medicine (class of 1985). In 2024 Medicare paid $53,059 for 109 patients, and Part D covered 844 of their prescriptions, 88% of them generic. Pfizer Inc. reported $24.27 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1508822867 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 25, 2006 |
| Last updated in NPPES | Jan 23, 2024 |
| Certified by provider | Jan 23, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 59434 | 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 - Internal Medicine (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 109 |
|---|---|
| Services billed | 711 across 35 procedure codes |
| Paid by Medicare | $53,059 |
Part D prescriptions in 2024
| Prescriptions (claims) | 844 · 2,032 30-day fills |
|---|---|
| Patients | 80 |
| Total drug cost | $76,671 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | Boston University School of Medicine |
|---|---|
| Graduation year | 1985 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Private Health Care Group, LLCWellesley, MA · 5 clinicians
Hospital affiliations
- Brigham and Women Faulkner HospitalJamaica Plain, MA
- Brigham and Women's HospitalBoston, MA
- Emerson Hospital -W Concord, MA
- Massachusetts General HospitalBoston, MA
- Newton-Wellesley HospitalNewton, MA
Other facilities
- Mass General Brigham Home Care, IncHome health agency · Newton, MA
Industry payments (Open Payments)
- 2025$24.27 · 1 payment from 1 company
- 2024$46.02 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $24.27 | 1 |
What the 2025 payments were for
- Food and Beverage$24.27 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 96 internal medicine physicians in Wellesley · All internal medicine physicians in Massachusetts