Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Nathaniel Adam Long, MD

Individual provider Internal Medicine Physician · NPI 1306585518

Nathaniel Adam Long, MD is an Internal Medicine in Portland, Maine. Graduated from Pennsylvania State University College of Medicine in 2022, 4 years ago. Practices with Mainehealth, a 2,615-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in Massachusetts and Maine.

Years since qualifying
4
Trained at
Pennsylvania State University College of Medicine
Licensed in
MA, ME
In the registry since
2022
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

22 Bramhall St
Portland, ME 04102-3134
Phone: (207) 662-4618
Fax: (207) 662-6254
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 330 Brookline Ave, Boston, MA 02215-5491 — (617) 667-7000
  • 1 Medical Center Dr, Biddeford, ME 04005-9422 — (207) 283-7937
  • 25 June St, Sanford, ME 04073-2621 — (207) 324-4310

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence MD29225 (ME)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD29225 (ME)
Internal Medicine Physician Taxonomy 207R00000X · Licence 293751 (MA)

Record details

NPI number1306585518
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 4, 2022
Last updated in NPPESJuly 7, 2025
Certification dateJuly 7, 2025

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesHOSPITALIST
Medical schoolPENNSYLVANIA STATE UNIVERSITY COLLEGE OF MEDICINE
Graduated 2022 (4 years in practice)
Group practice Mainehealth — 2615 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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