Gareth Singh Dulai, MD
Gastroenterology Physician · Downey, CA
Gareth Singh Dulai, MD is a gastroenterology physician with a practice address in Downey, California, and NPI 1164457883, issued on Jul 11, 2006. Check the license (California G80828, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gareth Singh Dulai
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- G80828 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9353 Imperial Hwy, Downey, CA 90242
- Phone
- (562) 657-4292
- Enumerated
- Jul 11, 2006
- Record last updated
- Dec 8, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (562) 657-4255
- Medicare enrollment
- Enrolled (PECOS I20051005001001); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Medical School, 1993
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 9353 Imperial Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maria Theresa Ammermann, NPFamily Nurse Practitioner1750594131
- Rajeev Attam, MDGastroenterology Physician1184694309
- Bryan Ballard, PTPhysical Therapist1851515126
- Quennie Basa, PHYSICAL THERAPISTOrthopedic Physical Therapist1043415235
- Hilarie Beattie, PAPhysician Assistant1215053459
- Christie Blondek, PA-C,DMSC,MSPAS,MPHPhysician Assistant1376912311
Verify Gareth Singh Dulai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G80828Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
68% more Medicare Part D claims than the average gastroenterology physician in 2024
1,361 Medicare Part D claims for 647 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Gavilyte-C448 claims
- Omeprazole409 claims
- Pantoprazole Sodium77 claims
- Carvedilol58 claims
- Sucralfate48 claims
- Mesalamine35 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 GroupDowney, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gareth Singh Dulai among 2,140 gastroenterology physician records in California
Gareth Singh Dulai, 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
- Graduated1993 · 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 Downey → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Rajeev Attam, MDDowney, CA 902421184694309
- Terence Chiu, MDDowney, CA 902421427083229
- Michelle Vu, M.D.Downey, CA 902421164715439
- Steven Weiss, MDDowney, CA 902421457569162
- Gaurang Chaurushia, MDDowney, CA 902411538126131
- Kevin Dholaria, M.D.Downey, CA 902411629343736
- Ann Lee, M.D.Downey, CA 902411396979126
- Andrew Nguyen, MDDowney, CA 902411154784783
Common questions
What is Gareth Singh Dulai, MD's NPI number?
Gareth Singh Dulai, MD's National Provider Identifier (NPI) is 1164457883, issued on Jul 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gareth Singh Dulai, MD located?
The NPPES record lists a practice address at 9353 Imperial Hwy, Downey, CA, 90242. Phone: (562) 657-4292. Providers update this record themselves, so call before visiting.
How can I verify Gareth Singh Dulai, MD's license?
NPPES lists California license number G80828, 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 Gareth Singh Dulai, MD prescribe under Medicare Part D?
In 2024, Gareth Singh Dulai, MD had 1,361 Medicare Part D claims for 647 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.