Bruce Greenwald, M.D.
Gastroenterology Physician · Ventura, CA
Bruce Greenwald, M.D. is a gastroenterology physician with a practice address in Ventura, California, and NPI 1619908829, issued on Jul 5, 2006. Check the license (California G48134, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Bruce Greenwald
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- G48134 CA
Self-reported in NPPES; status is on the state search - Practice location
- 888 S Hill RD, Ventura, CA 93003
- Phone
- (805) 477-6464
- Enumerated
- Jul 5, 2006
- Record last updated
- Dec 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (805) 477-6498
- Medicare enrollment
- Enrolled (PECOS I20080327000807); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 888 S Hill RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Charles Adams, M.D.Family Medicine Physician1811925225
- Erin Anderson, P.T.Physical Therapist1811916299
- Nathania BarriosPharmacist1346827763
- Charles Brenner, M.D.Orthopaedic Surgery Physician1548299035
- Eric Chun, M.D.Family Medicine Physician1699702381
- Megan Chynoweth, PHARM.D.Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1689980260
Verify Bruce Greenwald in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G48134Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% fewer Medicare Part D claims than the average gastroenterology physician in 2024
189 Medicare Part D claims for 72 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims.
Most prescribed
- Pantoprazole Sodium32 claims
- Gavilyte-C24 claims
- Omeprazole23 claims
- Mesalamine19 claims
- Lubiprostone16 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.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupVentura, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Bruce Greenwald among 2,140 gastroenterology physician records in California
Bruce Greenwald, M.D. 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
- Graduated1981 · median 2002 among the 1,538 with a school on file
- Record last updated2021 · 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 Ventura → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Stephen Covington, MDVentura, CA 930031154353456
- Sabine Hazan, MDVentura, CA 930031669418232
- Kip Lyche, MDVentura, CA 930031811927981
- Charles Menz, MDVentura, CA 930031447286141
- Benito PedrazaVentura, CA 930031851323026
- Dipti Sagar, MDVentura, CA 930031558642751
- Laya NasrollahCamarillo, CA 930121558673566
- Constante Abaya, MDOxnard, CA 930301003918459
Common questions
What is Bruce Greenwald, M.D.'s NPI number?
Bruce Greenwald, M.D.'s National Provider Identifier (NPI) is 1619908829, issued on Jul 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Bruce Greenwald, M.D. located?
The NPPES record lists a practice address at 888 S Hill RD, Ventura, CA, 93003. Phone: (805) 477-6464. Providers update this record themselves, so call before visiting.
How can I verify Bruce Greenwald, M.D.'s license?
NPPES lists California license number G48134, 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 Bruce Greenwald, M.D. prescribe under Medicare Part D?
In 2024, Bruce Greenwald, M.D. had 189 Medicare Part D claims for 72 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
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.