NPIMap

Individual provider Active NPI

Peter Fields II, MD

  • Gastroenterology Physician
  • Williamsville, NY
National Provider Identifier
1790246452
Registry record updated May 11, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Gastroenterology PhysicianTaxonomy code 207RG0100X
License
318131 Issued in NY
Practice address
60 Maple Rd Ste 1
Williamsville, NY 14221-2917
Phone
(716) 626-5250
NPI assigned
Mar 26, 2019
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on May 11, 2026

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Gastroenterology Physician 207RG0100X 318131 NY Primary

Addresses

Primary practice location

60 Maple Rd Ste 1
Williamsville, NY 14221-2917

Mailing address

Elm and Carlton St
Buffalo, NY 14263-0001
Phone (716) 845-2300

Other practice location 1

Elm and Carlton St
Buffalo, NY 14263-0001
Phone (716) 845-2300

Other identifiers 1

IdentifierTypeStateIssuer
07559759MedicaidNY

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in NY
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20250730000637 NY Practitioner - Gastroenterology 0941536981 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
Gastroenterology
Education
State University of New York at Buffalo School of Medicine, 2019
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Gastroenterology Associates LLPGroup PAC ID 8820048085, 28 clinicians

Practice addresses (Care Compare)

60 Maple Rd
Suite 1
Williamsville, NY 14221-2917
Phone (716) 626-5250

6935 Elaine Dr
Niagara Falls, NY 14304-2875
Phone (716) 626-5250

Hospital & facility affiliations

  • Kaleida Health Hospital, Buffalo, NY, CCN 330005
  • Sisters of Charity Hospital Hospital, Buffalo, NY, CCN 330078

Procedures performed for Medicare patients

ProcedureNumber of procedures
Colonoscopy120
Upper gastrointestinal (GI) endoscopy for acid reflux132

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
3367NHMDPediatric Occupational Therapist

Practice roles

OrganizationSpecialtyStatusNew patients
Gastroenterology Associates, LLP Gastroenterology CurrentSince Aug 25, 2025 Accepting new patients
Gastrointestinal Group Gastroenterology PastSince Sep 21, 2025 Accepting new patients

Locations

6935 Elaine Dr
Niagara Falls, NY 14304
Phone (716) 626-5250

60 Maple Rd
#1
Williamsville, NY 14221
Phone (716) 626-5250

Interoperability endpoints

  • Direct secure messaging: pfields@gastrowny.medentdirect.com

Organizations & group practices 3

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

Hospital & facility affiliations 8

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1553558400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1778457600000",
    "number": "1790246452",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "ELM AND CARLTON ST",
            "city": "BUFFALO",
            "state": "NY",
            "postal_code": "142630001",
            "telephone_number": "716-845-2300"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "60 MAPLE RD STE 1",
            "city": "WILLIAMSVILLE",
            "state": "NY",
            "postal_code": "142212917",
            "telephone_number": "716-626-5250"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "Elm and Carlton St",
            "address_purpose": "LOCATION",
            "city": "Buffalo",
            "state": "NY",
            "postal_code": "142630001",
            "country_code": "US",
            "telephone_number": "716-845-2300",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "FIELDS",
        "first_name": "PETER",
        "name_prefix": "Dr.",
        "name_suffix": "II",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2019-03-26",
        "last_updated": "2026-05-11",
        "certification_date": "2026-05-11",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "NY",
            "license": "318131",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "07559759",
            "state": "NY"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Williamsville, NY

Sources for this page

Verify at the official NPI Registry.