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

Timothy C O'Brien, MD

Individual provider Surgery Physician · NPI 1962441055

Timothy C O'Brien, MD practises General Surgery in Rockport, Maine. Graduated from Hahnemann University College of Medicine in 1992, 34 years ago. Practices with Mainehealth, a 2,615-clinician group and accepts Medicare assignment. Licensed in Maine.

Years since qualifying
34
Trained at
Hahnemann University College of Medicine
Licensed in
ME
In the registry since
2006
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

4 Glen Cove Dr Ste 103
Rockport, ME 04856-4235 Not confirmed with CMS for 12 years — call before visiting
Phone: (207) 593-5737
Fax: (207) 593-5333
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Surgery Physician (primary) Taxonomy 208600000X · Licence MD18627 (ME)

Record details

NPI number1962441055
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 5, 2006
Last updated in NPPESFebruary 5, 2014

Medicare enrollment

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

Medicare specialtyGENERAL SURGERY
Medical schoolHAHNEMANN UNIVERSITY COLLEGE OF MEDICINE
Graduated 1992 (34 years in practice)
Group practice Mainehealth — 2615 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Hernia repair - groin (open) 12 times · 91st percentile
Colonoscopy 1–10 times
Mastectomy 1–10 times
Melanoma (skin cancer) excision 1–10 times
Removal of tissue 1–10 times
Skin biopsy 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients125
Services billed 210 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Mainehealth Pen Bay Hospital Hospital · Rockport, ME

Colleagues at Mainehealth

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2615 clinicians in the practice; 12 are shown here.

Other providers in Rockport