Alexander Tonthat, MD, MBA
Gastroenterology Physician · Oroville, CA
Alexander Tonthat, MD, MBA is a gastroenterology physician with a practice address in Oroville, California, and NPI 1124522784, issued on Mar 20, 2018. Check the license (California A164621, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Alexander Tonthat
- Credential
- MD, MBA
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A164621 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2767 Olive Hwy Ste 9D, Oroville, CA 95966
- Phone
- (530) 533-8500
- Enumerated
- Mar 20, 2018
- Record last updated
- Jul 31, 2024
- Medicare enrollment
- Enrolled (PECOS I20240827001773); accepts Medicare assignment
- Medical or professional school
- Temple University School Of Medicine, 2018
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Verify Alexander Tonthat in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A164621Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% fewer Medicare Part D claims than the average gastroenterology physician in 2024
378 Medicare Part D claims for 174 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Most prescribed
- Metoclopramide Hcl106 claims
- Gavilyte-G67 claims
- Peg-3350 And Electrolytes48 claims
- Omeprazole30 claims
- Pantoprazole Sodium22 claims
- Esomeprazole Magnesium14 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.
Industry payments in 2024: $139.84
7 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Biotech, 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.
2 hospitals and group practices
- Oroville HospitalOroville, CA · Acute Care Hospitals1 of 5 stars
- Orohealth Corporation A Non Profit Healthcare SystemOroville, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Alexander Tonthat among 2,140 gastroenterology physician records in California
Alexander Tonthat, MD, MBA 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 2018, is newer than 94% of them.
- NPI issued2018 · 94% of these records are older, 4% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2018 · median 2002 among the 1,538 with a school on file
- Record last updated2024 · 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 Oroville → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Nathaniel Howard, MDOroville, CA 959661558325787
- Donald Mansell, M.D.Paradise, CA 959691730117862
- Damian Pestana, M.D.Paradise, CA 959691487603254
- Richard Roehrkasse, MDGrass Valley, CA 959491083234017
- Roy Foliente, M.D.Grass Valley, CA 959451598723348
- Kevin Hill, DOGrass Valley, CA 959451164524815
- Ken Chow, M.D.Yuba City, CA 959911699781203
- Siva Doma, M.D.Yuba City, CA 959911700819422
Common questions
What is Alexander Tonthat, MD, MBA's NPI number?
Alexander Tonthat, MD, MBA's National Provider Identifier (NPI) is 1124522784, issued on Mar 20, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Alexander Tonthat, MD, MBA located?
The NPPES record lists a practice address at 2767 Olive Hwy Ste 9D, Oroville, CA, 95966. Phone: (530) 533-8500. Providers update this record themselves, so call before visiting.
How can I verify Alexander Tonthat, MD, MBA's license?
NPPES lists California license number A164621, 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 Alexander Tonthat, MD, MBA prescribe under Medicare Part D?
In 2024, Alexander Tonthat, MD, MBA had 378 Medicare Part D claims for 174 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.