Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Daniel M Merson, DO

Individual provider Internal Medicine Physician · NPI 1982652129

Dr. Daniel M Merson, DO practises Internal Medicine in Portland, Maine. Graduated from Massachusetts College of Osteopathy in 1987, 39 years ago. Practices with Mercy Hospital, a 308-clinician group and accepts Medicare assignment. Licensed in Maine.

Years since qualifying
39
Trained at
Massachusetts College of Osteopathy
Licensed in
ME
In the registry since
2006
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

1250 Forest Ave
Portland, ME 04103-1884 Not confirmed with CMS for 18 years — call before visiting
Phone: (207) 878-5042
Fax: (207) 878-5043
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence ME1373 (ME)

Record details

NPI number1982652129
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMay 4, 2006
Last updated in NPPESOctober 16, 2008

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolMASSACHUSETTS COLLEGE OF OSTEOPATHY
Graduated 1987 (39 years in practice)
Group practice Mercy Hospital — 308 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $21 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Northern Light Mercy Hospital Hospital · Portland, ME

Colleagues at Mercy Hospital

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 308 clinicians in the practice; 12 are shown here.

Other providers in Portland