Mark D. Fleming, MD
NPI 1235148404ActiveIndividual· Pathology, Hematology· Boston, MA
Pathology, Hematology (MD) in Boston, Massachusetts, trained at Harvard Medical School (class of 1993). Enrolled in Medicare as practitioner - pathology. X4 Pharmaceuticals, Inc. was the largest of 2 companies reporting payments in 2025, $20,317 in all, mostly consulting fees.
Overview
| NPI | 1235148404 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 6, 2006 |
| Last updated in NPPES | Aug 20, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Pathology, Hematology Primary | 207ZH0000X | 153834 | MA |
| Pathology, Anatomic Pathology | 207ZP0101X | 153834 | 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 - Pathology (MA) |
|---|
Education and affiliations
| Medical school | Harvard Medical School |
|---|---|
| Graduation year | 1993 |
| Medicare specialty | Pathology |
| Secondary specialties | Hematology |
Medical group
- Children's Hospital Pathology Foundation IncBoston, MA · 15 clinicians
Industry payments (Open Payments)
- 2025$20,317 · 6 payments from 2 companies
- 2024$6,000 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| X4 Pharmaceuticals, Inc. | $20,250 | 5 |
| Karl Storz Endoscopy-America | $66.52 | 1 |
What the 2025 payments were for
- Consulting Fee$20,250 · 5 payments
- Food and Beverage$66.52 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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