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

Dr. Cashel O'Brien, DO

Individual provider Hospitalist Physician · NPI 1093275612

Dr. Cashel O'Brien, DO is a Hospitalist in Portland, Maine. Graduated from University of New England, College of Osteo Medicine in 2019, 7 years ago. Practices with Mainehealth, a 2,615-clinician group, works from 6 locations and accepts Medicare assignment. Licensed in Maine.

Years since qualifying
7
Trained at
University of New England, College of Osteo Medicine
Licensed in
ME
In the registry since
2019
Specialties on file
4
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

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 (5)

  • 1 Medical Center Dr, Biddeford, ME 04005-9422 — (207) 283-7937
  • 121 Medical Center Dr Ste 3100, Brunswick, ME 04011-2672 — (207) 729-7939
  • 24 Miles Center Way, Damariscotta, ME 04543-4067 — (207) 563-4811
  • 25 June St, Sanford, ME 04073-2621 — (207) 324-4310
  • 96 Campus Dr, Scarborough, ME 04074-7163 — (207) 885-9905

Specialties & licences

Cardiovascular Disease Physician (primary) Taxonomy 207RC0000X · Licence DO3386 (ME)
Hospitalist Physician Taxonomy 208M00000X · Licence DO3386 (ME)
Adolescent Medicine (Internal Medicine) Physician Taxonomy 207RA0000X · Licence DO3386 (ME)
Internal Medicine Physician Taxonomy 207R00000X · Licence DO3386 (ME)

Record details

NPI number1093275612
Entity typeIndividual (Type 1)
GenderFemale
Credentials DO
Sole proprietorNo
NPI enumeratedMarch 20, 2019
Last updated in NPPESJuly 9, 2026
Certification dateJuly 9, 2026
Mailing address22 Bramhall St, Portland, ME 04102-3134

Medicare enrollment

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

Medicare specialtyHOSPITALIST
Also practisesINTERNAL MEDICINE
Medical schoolUNIVERSITY OF NEW ENGLAND, COLLEGE OF OSTEO MEDICINE
Graduated 2019 (7 years in practice)
Group practice Mainehealth — 2615 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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