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Dr. Peter B. Gregory, MD
NPI1891889903
- Medicare services, 2018
- 62
- Part D claims, 2018
- 138
- Publications
- 37
- Industry payments
- $34
- State license
- 1
- Practice address
- 750 Welch Rd Ste 210, Palo Alto, CA 94304-1509
- Practice phone
- Call (650) 725-9924
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Gregory's professional email, personal email and mobile number
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Dr. Peter B. Gregory is a gastroenterologist in Palo Alto, California
Dr. Gregory practices in Palo Alto, California.
Dr. Gregory's NPI, 1891889903, was assigned on October 3, 2006. Dr. Gregory graduated from Yale School of Medicine in 1963. Dr. Gregory's California license number on file is G12521.
NPI and contact details
- NPI
- 1891889903NPI Registry (opens in a new tab)
- NPI enumeration date
- October 3, 2006
- NPI status
- Active
- Practice phone
- (650) 725-9924
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1963
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Peter B. Gregory's practice address is in Palo Alto, California
Dr. Gregory's practice address in the NPI Registry is 750 Welch Rd Ste 210, Palo Alto, CA 94304-1509. The practice phone is (650) 725-9924.
- NPI Registry address750 Welch Rd Ste 210, Palo Alto, CA 94304-1509Phone(650) 725-9924
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Peter B. Gregory's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gregory practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Gregory's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Peter B. Gregory is one of 1,977 gastroenterologists in California
Gastroenterology is Dr. Gregory's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Gregory is board certified in gastroenterology by the American Board of Internal Medicine. Dr. Gregory has a license on file in California.
Specialties and state licenses
- Gastroenterology, CaliforniaPrimary
Gastroenterologists near Dr. Gregory
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 B. Gregory billed Medicare for 62 services in 2018
CMS data shows 62 Medicare services from Dr. Gregory across 1 procedure code in 2018, all of them office visits. Medicare paid $3,148 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 201862
Paid by Medicare$3,148
Procedure codes1
Dr. Gregory's Medicare services by type, 2017 to 2018
- 2017
- 2018
- Office and hospital visits
- 2017: 1842018: 6266%
Dr. Gregory compared with the California median for gastroenterologists, 2018
- Dr. Gregory
- California median
- Medicare services
- 62vs 58689% below
- Part D claims
- 138vs 38064% below
Medians across 1,875 gastroenterologists in California with Dmand AI profiles that report each measure.
Dr. Gregory's most billed Medicare procedure codes, 2018
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gregory and other gastroenterologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Peter B. Gregory's patients have a median age of 92
Across all payers, Dmand AI patient panel data puts Dr. Gregory's median patient age at 92, with 0% women.
Dr. Gregory's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 92
Patient panel by sex, all payers
- Women0%
- Men100%
Source: Dmand AI Patient Panel Data
Dr. Peter B. Gregory wrote 138 Medicare Part D claims in 2018
In 2018, Dr. Gregory wrote 138 Medicare Part D claims. They cover 7 drugs, with $91,111 in total drug cost. In 2017, CMS named 338 claims across 16 drugs.
Part D claims, 2018138
Drugs named by CMS7
Total drug cost$91,111
Dr. Gregory's most prescribed drugs by claims, 2018
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2017 to 2018
- 2017
- 2018
- Claims for drugs CMS names
- 2017: 3382018: 13859%
Drugs named by CMS: 7 in 2018, 16 in 2017.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Peter B. Gregory has 37 publications on record
Dmand AI links 37 papers to Dr. Gregory in 2011. The most frequent topics are Hepatitis B, Hepatitis B Surface Antigens and Hepatitis B virus. Dr. Gregory has published most often in Gastroenterology. Dr. Gregory's most frequent co-authors are Harry B. Greenberg, MD, Vinod K. Sawhney, MD and Terrence Francis Blaschke, MD.
Papers37
Topics Dr. Gregory writes about most
- Hepatitis B
- Hepatitis B Surface Antigens
- Hepatitis B virus
- DNA-Directed DNA Polymerase
- Interferons
- Liver
- Liver Cirrhosis
- Random Allocation
Dr. Gregory's most frequent co-authors
- Harry B. Greenberg, MD4 shared papers
- Vinod K. Sawhney, MD4 shared papers
- Terrence Francis Blaschke, MD3 shared papers
Recent publications by Dr. Gregory
Blood Cell CountHematuriaJapan
Antineoplastic AgentsGastrointestinal NeoplasmsHodgkin Disease
CaliforniaChemical and Drug Induced Liver InjuryHalothane
DNA-Directed DNA PolymeraseHepatitis BHepatitis B Antigens
See who Dr. Gregory researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Gregory works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Peter B. Gregory received $34 in industry payments in 2024
CMS Open Payments shows 1 general payment to Dr. Gregory from 1 drug or device company in 2024. Travel and lodging make up the largest share, 100% of the total. Medtronic, Inc. paid the most, $34.
Companies that paid Dr. Gregory the most, 2024 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Peter B. Gregory has 1 award and honors on record
Dmand AI lists 1 award for Dr. Gregory, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Gregory
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Peter B. Gregory graduated from Yale School of Medicine
Dr. Gregory graduated from Yale School of Medicine in 1963.
- Medical school
- Board certified in gastroenterology
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Sources for Dr. Peter B. Gregory'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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 B. Gregory
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 B. Gregory's NPI number?
Dr. Peter B. Gregory's NPI number is 1891889903. It was assigned on October 3, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Peter B. Gregory?
Dr. Peter B. Gregory is a gastroenterologist in Palo Alto, California. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Peter B. Gregory practice?
Dr. Gregory practices at 750 Welch Rd Ste 210, Palo Alto, CA 94304-1509.
What is Dr. Peter B. Gregory's office phone number?
The practice phone on file for Dr. Gregory is (650) 725-9924.
What is Dr. Peter B. Gregory's medical license number?
Dr. Gregory's California license number on file is G12521.
Does Dr. Peter B. Gregory accept Medicare?
Yes. CMS data shows Dr. Gregory billed Medicare for 62 services in 2018.
Is Dr. Peter B. Gregory board certified?
Yes. Dr. Gregory is board certified in gastroenterology by the American Board of Internal Medicine.
What services does Dr. Peter B. Gregory bill to Medicare?
In 2018, Dr. Gregory's most billed Medicare services were office visit, established patient (99214).
Where did Dr. Peter B. Gregory go to medical school?
Dr. Gregory graduated from Yale School of Medicine in 1963.
What drugs does Dr. Peter B. Gregory prescribe most?
In 2018 Medicare Part D data, Dr. Gregory's most prescribed drugs by claims were Ursodiol, Entecavir and Omeprazole.
Show 4 more questionsShow fewer questions
Has Dr. Peter B. Gregory received payments from drug or device companies?
CMS Open Payments shows $34 in general payments to Dr. Gregory from 1 company from 2024 to 2024. The largest total came from Medtronic, Inc.
How long has Dr. Peter B. Gregory been practicing?
Dr. Gregory graduated from medical school in 1963, 63 years ago.
Does Dr. Peter B. Gregory do research?
Dmand AI links 37 publications to Dr. Gregory.
Who does Dr. Peter B. Gregory publish with?
Dr. Gregory's most frequent co-authors are Harry B. Greenberg, MD (4 shared papers), Vinod K. Sawhney, MD (4 shared papers) and Terrence Francis Blaschke, MD (3 shared papers).
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