Gregory Fung, MD
Gastroenterology Physician · San Francisco, CA
Gregory Fung, MD is a gastroenterology physician with a practice address in San Francisco, California, and NPI 1700970795, issued on Oct 3, 2006. Check the license (California G41709, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gregory Fung
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- G41709 CA
Self-reported in NPPES; status is on the state search - Practice location
- 789 Vallejo Street, San Francisco, CA 94133
- Phone
- (415) 982-6691
- Enumerated
- Oct 3, 2006
- Record last updated
- Dec 11, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (415) 982-0914
- Medicare enrollment
- Enrolled (PECOS I20081203000520); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 1978
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Verify Gregory Fung in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G41709Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.0 times the Medicare Part D claims of the average gastroenterology physician in 2024
1,645 Medicare Part D claims for 271 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Pantoprazole Sodium219 claims
- Famotidine205 claims
- Omeprazole118 claims
- Atorvastatin Calcium60 claims
- Metformin Hcl50 claims
- Metoclopramide Hcl49 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 88.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $46.36
1 payment: food and beverage; the largest payer was Medtronic, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- City And County OF San FranciscoSan Francisco, CA
- San Francisco Digestive Disease Medical Group Inc A Prof CorpSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Fung among 2,140 gastroenterology physician records in California
Gregory Fung, MD is one of 2,140 gastroenterology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 48% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1978 · median 2002 among the 1,538 with a school on file
- Record last updated2008 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in San Francisco → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- James Yan, D.O.San Francisco, CA 941331588683890
- Thomas Twaddell, M.D.San Francisco, CA 941311760751176
- Kendall BeckSan Francisco, CA 941431972892057
- John Cello, MDSan Francisco, CA 941431346205168
- Joseph Chen, M.D.San Francisco, CA 941431558500603
- Jennifer Chen, MDSan Francisco, CA 941431376771758
- Lukejohn Day, M.D.San Francisco, CA 941431669623773
- Courtney Gonzales, M.D.San Francisco, CA 941431669708830
Common questions
What is Gregory Fung, MD's NPI number?
Gregory Fung, MD's National Provider Identifier (NPI) is 1700970795, issued on Oct 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Fung, MD located?
The NPPES record lists a practice address at 789 Vallejo Street, San Francisco, CA, 94133. Phone: (415) 982-6691. Providers update this record themselves, so call before visiting.
How can I verify Gregory Fung, MD's license?
NPPES lists California license number G41709, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory Fung, MD prescribe under Medicare Part D?
In 2024, Gregory Fung, MD had 1,645 Medicare Part D claims for 271 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Gregory Fung, MD's MIPS final score?
The 2023 MIPS final score is 88.3 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.