Dr. Peter M. Fields II, MD
- Part D claims, 2024
- 135
- Hospital affiliations
- 2
- Industry payments
- $225
- Medical groups
- 2
- State license
- 1
- Practice address
- 60 Maple Road, Suite #2, Williamsville, NY 14221
- Practice phone
- Call (716) 322-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Endoscopy Center of Western New York
Surgery Center - Medicare-Certified · Williamsville, New York
Find Dr. Fields' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Peter M. Fields II is a gastroenterologist in Buffalo, New York
Dr. Fields practices at Endoscopy Center of Western New York in Williamsville, New York.
Dr. Fields' NPI, 1790246452, was assigned on March 26, 2019. Dr. Fields holds New York license 318131.
- NPI
- 1790246452NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0941536981
- NPI enumeration date
- March 26, 2019
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (716) 322-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 27
- Medical school graduation
- 2025
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Peter M. Fields II practices at Endoscopy Center of Western New York in Williamsville, New York
Dr. Fields' primary practice is Endoscopy Center of Western New York, at 60 Maple Road, Suite #2, Williamsville, NY 14221. The practice phone is (716) 322-1000.
- Endoscopy Center of Western New York60 Maple Road, Suite #2, Williamsville, NY 14221Phone(716) 322-1000
Source: Dmand AI Affiliation Data
Dr. Peter M. Fields II is affiliated with 5 sites of care and 2 medical groups
Dr. Fields' primary practice is Endoscopy Center of Western New York in Williamsville, New York. Dr. Fields is also affiliated with Buffalo General Medical Center/Gates Vascular Institute. The medical group on file is Roswell Park Comprehensive Cancer Center. Dmand AI also links Dr. Fields to 1 more hospital, 2 group practices and clinics and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Peter M. Fields II's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Fields practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Endoscopy Center of Western New York | Available with a free account |
| +4 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Peter M. Fields II is one of 1,583 gastroenterologists in New York
Gastroenterology is Dr. Fields' primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Fields is licensed in New York.
Specialties and state licenses
- Gastroenterology, New YorkPrimary
Gastroenterologists near Dr. Fields
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Peter M. Fields II's patients have a median age of 55
Across all payers, Dmand AI patient panel data puts Dr. Fields' median patient age at 55, with 54% women.
Dr. Fields' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 55
Patient panel by sex, all payers
- Women54%
- Men44%
Source: Dmand AI Patient Panel Data
Dr. Peter M. Fields II wrote 135 Medicare Part D claims in 2024
In 2024, Dr. Fields wrote 135 Medicare Part D claims for 26 patients. 73% of them were for generic drugs. CMS names the drug for 96 of them, across 6 drugs with 11 or more claims each, at $151,112 in total drug cost.
Dr. Fields' Part D claims by kind of drug, 2024
- Generic99 claims73%
- Brand-name36 claims27%
Dr. Fields' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Peter M. Fields II ranks in the 95th percentile for colonoscopy in Medicare
Dr. Fields accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 221 procedures of colonoscopy by Dr. Fields, more than 95% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Fields ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 93rd percentile248 procedures
- Colonoscopy
- 95th percentile221 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Peter M. Fields II received $225 in industry payments in 2025
CMS Open Payments shows 5 general payments to Dr. Fields from 4 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $150.
Companies that paid Dr. Fields the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Peter M. Fields II's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Peter M. Fields II
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Peter M. Fields II's NPI number?
Dr. Peter M. Fields II's NPI number is 1790246452. It was assigned on March 26, 2019, and it is active in the NPI Registry.
What kind of doctor is Dr. Peter M. Fields II?
Dr. Peter M. Fields II is a gastroenterologist in Buffalo, New York. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Peter M. Fields II practice?
Dr. Fields practices at 60 Maple Road, Suite #2, Williamsville, NY 14221. Dr. Fields' primary practice is Endoscopy Center of Western New York in Williamsville, New York. Dmand AI also links Dr. Fields to 1 hospital, 2 group practices and clinics and 1 medical group.
What is Dr. Peter M. Fields II's office phone number?
The practice phone on file for Dr. Fields is (716) 322-1000.
What is Dr. Peter M. Fields II's medical license number?
Dr. Fields holds New York license 318131.
Which hospitals is Dr. Peter M. Fields II affiliated with?
Dr. Fields is affiliated with Buffalo General Medical Center/Gates Vascular Institute. Dmand AI links Dr. Fields to 1 more hospital.
What medical group is Dr. Peter M. Fields II part of?
Dr. Fields is linked to Roswell Park Comprehensive Cancer Center. Dmand AI links Dr. Fields to 1 more medical group.
Does Dr. Peter M. Fields II accept Medicare?
Yes. CMS lists Dr. Fields as accepting Medicare assignment.
What drugs does Dr. Peter M. Fields II prescribe most?
In 2024 Medicare Part D data, Dr. Fields' most prescribed drugs by claims were Pantoprazole Sodium, Omeprazole and Entecavir.
Has Dr. Peter M. Fields II received payments from drug or device companies?
CMS Open Payments shows $225 in general payments to Dr. Fields from 4 companies from 2025 to 2025. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Peter M. Fields II been practicing?
Dr. Fields graduated from medical school in 2025, 1 years ago.
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