Daniel L. Loiselle, MD
Internal Medicine Physician · Portland, ME
Daniel L. Loiselle, MD is an internal medicine physician with a practice address in Portland, Maine, and NPI 1316906589, issued on Mar 17, 2006. Check the license (Maine 014644, as entered in NPPES) on the Maine Board of Licensure in Medicine; the Medicare figures below come from public CMS files.
- Name
- Daniel L. Loiselle
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 014644 ME
Self-reported in NPPES; status is on the state search - Practice location
- 84 Marginal Way, Portland, ME 04101
- Phone
- (207) 774-5816
- Enumerated
- Mar 17, 2006
- Record last updated
- Mar 16, 2026
- Fax
- (207) 523-8595
- Medicaid ID
- 2580Z0099 ME
- Medicare enrollment
- Enrolled (PECOS I20050823000902); accepts Medicare assignment
- Medical or professional school
- Geisel School Of Medicine At Dartmouth, 1995
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 597 in Maine → Look up another NPI →
Also registered at 84 Marginal Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Daniel L. Loiselle in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaine Board of Licensure in Medicine
Search for license 014644Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.7 times the Medicare Part D claims of the average internal medicine physician in 2024
8,646 Medicare Part D claims for 614 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 184 claims were for opioids.
Most prescribed
- Atorvastatin Calcium713 claims
- Lisinopril486 claims
- Levothyroxine Sodium387 claims
- Omeprazole332 claims
- Amlodipine Besylate327 claims
- Metoprolol Succinate327 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
- Intermed PAPortland, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Daniel L. Loiselle among 597 internal medicine physician records in Maine
Daniel L. Loiselle, MD 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
- Graduated1995 · median 2005 among the 369 with a school on file
- Record last updated2026 · 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
- Joel Botler, MDPortland, ME 041011891764577
- Charles Cathcart, MDPortland, ME 041011861461535
- Wendy Cathcart, MDPortland, ME 041011295704971
- Thomas Claffey, MDPortland, ME 041011487623153
- Steven Dobieski, MDPortland, ME 041011942279617
- John Erickson, MDPortland, ME 041011043289713
- Debra Fuchs Ertman, MDPortland, ME 041011730158403
- Phyllidia Ku-Ruth, MDPortland, ME 041011497724108
Common questions
What is Daniel L. Loiselle, MD's NPI number?
Daniel L. Loiselle, MD's National Provider Identifier (NPI) is 1316906589, issued on Mar 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Daniel L. Loiselle, MD located?
The NPPES record lists a practice address at 84 Marginal Way, Portland, ME, 04101. Phone: (207) 774-5816. Providers update this record themselves, so call before visiting.
How can I verify Daniel L. Loiselle, MD's license?
NPPES lists Maine license number 014644, 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 L. Loiselle, MD prescribe under Medicare Part D?
In 2024, Daniel L. Loiselle, MD had 8,646 Medicare Part D claims for 614 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.