Michael Mannstadt, MD
NPI 1750362661ActiveIndividual· Internal Medicine· Boston, MA
Internal Medicine (MD) with Massachusetts General Physicians Organization Inc and 1 other group, practicing in Boston, Massachusetts. Their prescriptions cost Medicare Part D more than their services did: $120,796 for 165 claims, against $13,562 paid for services in 2024. Alexion Pharmaceuticals, Inc. was the largest of 5 companies reporting payments in 2025, $40,163 in all, mostly travel and lodging. Lists Brigham and Women's Hospital and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1750362661 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 8, 2005 |
| Last updated in NPPES | Aug 1, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 217401 | 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 - Endocrinology (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 145 |
|---|---|
| Services billed | 193 across 8 procedure codes |
| Paid by Medicare | $13,562 |
Part D prescriptions in 2024
| Prescriptions (claims) | 165 · 423 30-day fills |
|---|---|
| Patients | 44 |
| Total drug cost | $120,796 |
| Generic share | 79% of claims |
Education and affiliations
| Graduation year | 1991 |
|---|---|
| Medicare specialty | Endocrinology |
| 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
- Massachusetts General HospitalBoston, MA
- Newton-Wellesley HospitalNewton, MA
- North Shore Medical Center -Salem, MA
- Wentworth-Douglass HospitalDover, NH
Industry payments (Open Payments)
- 2025$40,163 · 19 payments from 5 companies
- 2024$3,864 · 6 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alexion Pharmaceuticals, Inc. | $26,432 | 12 |
| Pharmacosmos Therapeutics Inc. | $5,642 | 2 |
| Ascendis Pharma Endocrinology Inc | $3,452 | 1 |
| Takeda Pharmaceuticals U.S.A., Inc. | $3,115 | 2 |
| Chugai Pharmaceutical Co., Ltd. | $1,522 | 2 |
What the 2025 payments were for
- Travel and Lodging$15,460 · 8 payments
- Consulting Fee$11,365 · 4 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$7,502 · 2 payments
- Honoraria$5,454 · 1 payment
- Food and Beverage$381.77 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 2,375 internal medicine physicians in Boston · All internal medicine physicians in Massachusetts