Daniel M. Merson, D.O
NPI 1982652129ActiveIndividual· Internal Medicine· Portland, ME
Internal Medicine (D.O) in Portland, Maine, trained at Massachusetts College of Osteopathy (class of 1987). Part D covered 268 prescriptions written in 2024, 26% of them generic. Glaxosmithkline, LLC. reported $20.65 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1982652129 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O |
| Sole proprietor | No |
| NPI issued | May 4, 2006 |
| Last updated in NPPES | Oct 16, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | ME1373 | ME |
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 (ME) |
|---|
Part D prescriptions in 2024
| Prescriptions (claims) | 268 · 567 30-day fills |
|---|---|
| Patients | 62 |
| Total drug cost | $162,502 |
| Generic share | 26% of claims |
Education and affiliations
| Medical school | Massachusetts College of Osteopathy |
|---|---|
| Graduation year | 1987 |
| Medicare specialty | Internal Medicine |
Medical group
- Mercy HospitalPortland, ME · 301 clinicians
Hospital affiliation
- Northern Light Mercy HospitalPortland, ME
Industry payments (Open Payments)
- 2025$20.65 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $20.65 | 1 |
What the 2025 payments were for
- Food and Beverage$20.65 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 150 internal medicine physicians in Portland · All internal medicine physicians in Maine