Daniel M. Merson, D.O
Internal Medicine Physician · Portland, ME
Daniel M. Merson, D.O is an internal medicine physician with a practice address in Portland, Maine, and NPI 1982652129, issued on May 4, 2006. Check the license (Maine ME1373, as entered in NPPES) on the Maine Board of Licensure in Medicine; the Medicare figures below come from public CMS files.
- Name
- Daniel M. Merson
- Credential
- D.O
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- ME1373 ME
Self-reported in NPPES; status is on the state search - Practice location
- 1250 Forest Ave, Portland, ME 04103
- Phone
- (207) 878-5042
- Enumerated
- May 4, 2006
- Record last updated
- Oct 16, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (207) 878-5043
- Medicare enrollment
- Enrolled (PECOS I20050627000186); accepts Medicare assignment
- Medical or professional school
- Massachusetts College Of Osteopathy, 1987
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 597 in Maine → Look up another NPI →
Also registered at 1250 Forest Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Daniel M. Merson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaine Board of Licensure in Medicine
Search for license ME1373Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average internal medicine physician in 2024
268 Medicare Part D claims for 62 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 65% of claims.
Most prescribed
- Jardiance33 claims
- Trulicity25 claims
- Tresiba Flextouch U-10022 claims
- Nano 2nd Gen Pen Needle18 claims
- Tresiba Flextouch U-20017 claims
- Symlinpen 6015 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Mercy HospitalPortland, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Daniel M. Merson among 597 internal medicine physician records in Maine
Daniel M. Merson, D.O is one of 597 internal medicine physician records with a practice address in Maine. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 44% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1987 · median 2005 among the 369 with a school on file
- Record last updated2008 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Maine practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
145 internal medicine physician records list a practice address in Portland
They are 145 of the 6,022 NPPES records with a practice address in Portland, and 597 internal medicine physician records in Maine.
All 597 in Maine → Every provider in Portland → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Douglas Couper, MDPortland, ME 041031154371243
- Pamela Courtney, D.O.Portland, ME 041031225064967
- Dale Gowen, MDPortland, ME 041031730114901
- Brad Huot, MDPortland, ME 041031891866372
- Lauren Michalakes, MDPortland, ME 041031093850059
- Louisa Bauer, MDPortland, ME 041021811574668
- Timothy Bender, DOPortland, ME 041021841827284
- Shannon Donovan, DOPortland, ME 041021629727854
Common questions
What is Daniel M. Merson, D.O's NPI number?
Daniel M. Merson, D.O's National Provider Identifier (NPI) is 1982652129, issued on May 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Daniel M. Merson, D.O located?
The NPPES record lists a practice address at 1250 Forest Ave, Portland, ME, 04103. Phone: (207) 878-5042. Providers update this record themselves, so call before visiting.
How can I verify Daniel M. Merson, D.O's license?
NPPES lists Maine license number ME1373, as entered by the provider. Search the Maine Board of Licensure in Medicine at https://www.maine.gov/md/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Daniel M. Merson, D.O prescribe under Medicare Part D?
In 2024, Daniel M. Merson, D.O had 268 Medicare Part D claims for 62 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.