Gerald L. Tarder, M.D.
Gastroenterology Physician · Walnut Creek, CA
Gerald L. Tarder, M.D. is a gastroenterology physician with a practice address in Walnut Creek, California, and NPI 1396833984, issued on Oct 10, 2006. Check the license (California G26001, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gerald L. Tarder
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- G26001 CA
Self-reported in NPPES; status is on the state search - Practice location
- 130 LA Casa Via, Walnut Creek, CA 94598
- Phone
- (925) 938-6060
- Enumerated
- Oct 10, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (925) 938-0119
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 130 LA Casa Via
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- David Cook, MDAllergy & Immunology Physician1740282425
Verify Gerald L. Tarder in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G26001Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average gastroenterology physician in 2024
117 Medicare Part D claims for 59 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Sod Sulf-Potass Sulf-Mag Sulf33 claims
- Pantoprazole Sodium24 claims
- Omeprazole13 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.
Gerald L. Tarder among 2,140 gastroenterology physician records in California
Gerald L. Tarder, 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 fileNo · 72% of these records are
- Record last updated2007 · 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 Walnut Creek → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Mervyn Becker, MDWalnut Creek, CA 945981841329430
- Steve Cheng, MDWalnut Creek, CA 945981245318328
- Shireen Ghorbani, M.D.Walnut Creek, CA 945981083845598
- Varujan Keledjian, M.D.Walnut Creek, CA 945981508831678
- Henry Kung, M.D.Walnut Creek, CA 945981518941673
- Will Lane, M.D.Walnut Creek, CA 945981548244684
- David Lin, M.D.Walnut Creek, CA 945981982664041
- Cynthia Mullen, M.D.Walnut Creek, CA 945981013123140
Common questions
What is Gerald L. Tarder, M.D.'s NPI number?
Gerald L. Tarder, M.D.'s National Provider Identifier (NPI) is 1396833984, issued on Oct 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gerald L. Tarder, M.D. located?
The NPPES record lists a practice address at 130 LA Casa Via, Walnut Creek, CA, 94598. Phone: (925) 938-6060. Providers update this record themselves, so call before visiting.
How can I verify Gerald L. Tarder, M.D.'s license?
NPPES lists California license number G26001, 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 Gerald L. Tarder, M.D. prescribe under Medicare Part D?
In 2024, Gerald L. Tarder, M.D. had 117 Medicare Part D claims for 59 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.