Gene Ma, M.D.
Gastroenterology Physician · San Jose, CA
Gene Ma, M.D. is a gastroenterology physician with a practice address in San Jose, California, and NPI 1316238579, issued on Apr 22, 2011. Check the license (California A122085, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gene Ma
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A122085 CA
Self-reported in NPPES; status is on the state search - Practice location
- 270 International Cir Bldg 3, San Jose, CA 95119
- Phone
- (408) 972-7000
- Enumerated
- Apr 22, 2011
- Record last updated
- Feb 11, 2022
- Medicare enrollment
- Enrolled (PECOS I20181108001904); accepts Medicare assignment
- Medical or professional school
- Stanford University School Of Medicine, 2011
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 270 International Cir Bldg 3
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jesse Klimek, DPTPhysical Therapist1225500648
- Michael Lee, MDHematology & Oncology Physician1629631296
- Rachael LewinPhysical Therapist1225517949
- Wei YangStudent in an Organized Health Care Education/Training Program1871936930
Verify Gene Ma in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A122085Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average gastroenterology physician in 2024
120 Medicare Part D claims for 79 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Gavilyte-C49 claims
- Omeprazole21 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: $86.59
2 payments; by number, the most common kind was food and beverage; the largest payer was Boston Scientific Corporation. 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 one group practice
- Permanente Medical Group IncSan Jose, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gene Ma among 2,140 gastroenterology physician records in California
Gene Ma, 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 2011, is newer than 74% of them.
- NPI issued2011 · 74% of these records are older, 23% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2011 · median 2002 among the 1,538 with a school on file
- Record last updated2022 · 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 Jose → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Omar Bakr, MD, MPHSan Jose, CA 951191275995953
- Alan Chin, MDSan Jose, CA 951191750467262
- Justin Chuang, M.D.San Jose, CA 951191205368537
- Ranjit Makar, MDSan Jose, CA 951191083858997
- Luis Ocampo, M.D.San Jose, CA 951191831480466
- Gurpreet Rihal, MDSan Jose, CA 951191093891509
- Gordon Thenemann, MDSan Jose, CA 951191861578361
- William Thurston, MDSan Jose, CA 951191407932908
Common questions
What is Gene Ma, M.D.'s NPI number?
Gene Ma, M.D.'s National Provider Identifier (NPI) is 1316238579, issued on Apr 22, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Gene Ma, M.D. located?
The NPPES record lists a practice address at 270 International Cir Bldg 3, San Jose, CA, 95119. Phone: (408) 972-7000. Providers update this record themselves, so call before visiting.
How can I verify Gene Ma, M.D.'s license?
NPPES lists California license number A122085, 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 Gene Ma, M.D. prescribe under Medicare Part D?
In 2024, Gene Ma, M.D. had 120 Medicare Part D claims for 79 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.