Mark Stephan Ostrem, MD
NPI 1811985633ActiveIndividual· Internal Medicine, Geriatric Medicine· Quincy, MA
Internal Medicine, Geriatric Medicine (MD) in Quincy, Massachusetts, trained at University of Minnesota Medical School (class of 1976). Their prescriptions cost Medicare Part D more than their services did: $2,390,287 for 16,508 claims, against $168,853 paid for services in 2024. Neurocrine Biosciences, Inc. was the largest of 2 companies reporting payments in 2025, $199.13 in all, mostly food and beverage.
Overview
| NPI | 1811985633 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 6, 2005 |
| Last updated in NPPES | Jan 15, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Geriatric Medicine Primary | 207RG0300X | 44501 | 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 | 215 |
|---|---|
| Services billed | 2,066 across 14 procedure codes |
| Paid by Medicare | $168,853 |
Part D prescriptions in 2024
| Prescriptions (claims) | 16,508 · 16,593 30-day fills |
|---|---|
| Patients | 209 |
| Total drug cost | $2,390,287 |
| Generic share | 81% of claims |
Education and affiliations
| Medical school | University of Minnesota Medical School |
|---|---|
| Graduation year | 1976 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Geriatric Medicine |
Medical group
- Pembroke Medical Associates IncPembroke, MA · 26 clinicians
Hospital affiliations
- Beth Israel Deaconess Hospital - MiltonMilton, MA
- Brigham and Women Faulkner HospitalJamaica Plain, MA
- South Shore HospitalSouth Weymouth, MA
Other facilities
- Serenity Hospice, LLCHospice · Southborough, MA
- Affinity HealthcareNursing home · Braintree, MA
- Alliance Health at Marina BayNursing home · Quincy, MA
- Boston Home, Inc (The)Nursing home · Boston, MA
Industry payments (Open Payments)
- 2025$199.13 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Neurocrine Biosciences, Inc. | $109.59 | 1 |
| Otsuka America Pharmaceutical, Inc. | $89.54 | 1 |
What the 2025 payments were for
- Food and Beverage$199.13 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other geriatricians in Quincy
- 1538159579
- 1255321253
- 1386645679
- 1467401398