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

Dr. Peter Fields II, MD

Individual provider Gastroenterology Physician · NPI 1790246452

Dr. Peter Fields II, MD practises Gastroenterology in Williamsville, New York. Graduated from State University of New York at Buffalo School of Medicine in 2019, 7 years ago. Practices with Gastroenterology Associates LLP, a 28-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in New York.

Years since qualifying
7
Trained at
State University of New York at Buffalo School of Medicine
Licensed in
NY
In the registry since
2019
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

60 Maple Rd Ste 1
Williamsville, NY 14221-2917
Phone: (716) 626-5250
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • Elm And Carlton St, Buffalo, NY 14263-0001 — (716) 845-2300

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 318131 (NY)

Record details

NPI number1790246452
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 26, 2019
Last updated in NPPESMay 11, 2026
Certification dateMay 11, 2026

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolSTATE UNIVERSITY OF NEW YORK AT BUFFALO SCHOOL OF MEDICINE
Graduated 2019 (7 years in practice)
Group practice Gastroenterology Associates Llp — 28 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 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.

Colonoscopy 120 times · 84th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 132 times · 82nd percentile

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $225 5 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Gastroenterology Associates LLP

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 28 clinicians in the practice; 12 are shown here.

Other providers in Williamsville