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

William Gregory Feero, MD, PHD

Individual provider Family Medicine Physician · NPI 1285600239

William Gregory Feero, MD, PHD is registered under Family Practice in Westbrook, Maine. Graduated from University of Pittsburgh School of Medicine in 1998, 28 years ago. Practices with Mainegeneral Medical Center, a 556-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Maine.

Years since qualifying
28
Trained at
University of Pittsburgh School 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.
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

1 Harnois Ave Ste 1B
Westbrook, ME 04092-4395
Phone: (207) 662-1340
Fax: (207) 662-1341
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 4 Sheridan Rd, Fairfield, ME 04937-3314 — (207) 861-5000

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence MD15570 (ME)

Record details

NPI number1285600239
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , PHD
Sole proprietorNo
NPI enumeratedFebruary 28, 2006
Last updated in NPPESMay 7, 2026
Certification dateMay 7, 2026

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolUNIVERSITY OF PITTSBURGH SCHOOL OF MEDICINE
Graduated 1998 (28 years in practice)
Group practice Mainegeneral Medical Center — 556 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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.

Removal of skin lesions 1–10 times
Removal or shaving of skin growth 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 patients81
Services billed 270 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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.

Colleagues at Mainegeneral Medical Center

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 556 clinicians in the practice; 12 are shown here.

Other providers in Westbrook