Adam Marshall Buck, M.D.
Internal Medicine Physician · Martinez, CA
Adam Marshall Buck, M.D. is an internal medicine physician with a practice address in Martinez, California, and NPI 1346564119, issued on Mar 22, 2010. Check the license (California A119186, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Adam Marshall Buck
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A119186 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2500 Alhambra Ave, Martinez, CA 94553
- Phone
- (925) 370-5000
- Enumerated
- Mar 22, 2010
- Record last updated
- Dec 5, 2013 (not updated in 13 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 2500 Alhambra Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Adam Marshall Buck in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A119186Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
58 Medicare Part D claims for 21 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 41% of 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.
Adam Marshall Buck among 17,696 internal medicine physician records in California
Adam Marshall Buck, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 63% of them.
- NPI issued2010 · 63% of these records are older, 34% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2013 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
48 internal medicine physician records list a practice address in Martinez
They are 48 of the 1,816 NPPES records with a practice address in Martinez, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Martinez → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Chapman, MDMartinez, CA 945531578548129
- George Chuang, DOMartinez, CA 945531235217324
- Jeremy Fish, MDMartinez, CA 945531952497943
- Thomas Gamsky, MDMartinez, CA 945531043296247
- Gerhard Heinrich, M.D.Martinez, CA 945531306828728
- Nancy Lazarus, M.D.Martinez, CA 945531073598223
- Sara Levin, MDMartinez, CA 945531184707853
- Brian O'Neill, M.D.Martinez, CA 945531366425985
Common questions
What is Adam Marshall Buck, M.D.'s NPI number?
Adam Marshall Buck, M.D.'s National Provider Identifier (NPI) is 1346564119, issued on Mar 22, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Adam Marshall Buck, M.D. located?
The NPPES record lists a practice address at 2500 Alhambra Ave, Martinez, CA, 94553. Phone: (925) 370-5000. Providers update this record themselves, so call before visiting.
How can I verify Adam Marshall Buck, M.D.'s license?
NPPES lists California license number A119186, 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 Adam Marshall Buck, M.D. prescribe under Medicare Part D?
In 2024, Adam Marshall Buck, M.D. had 58 Medicare Part D claims for 21 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.